| 单词 | white dwarf |
| 例句 | But a more massive star will spend its nuclear fuel faster, become a red giant sooner, and be first to enter the final white dwarf decline. Cosmos 1980-01-01T00:00:00Z A star like the Sun will end its days, as we have seen, as a red giant and then a white dwarf. Cosmos 1980-01-01T00:00:00Z When that sally got no response, he lapsed back into silence, contemplating the rolling rump of the white dwarf elephant ahead of them. A Dance with Dragons 2011-07-12T00:00:00Z We observe a large number of these white dwarf stars. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z A two-wheeled cart went rumbling past them, pulled by a white dwarf elephant. A Dance with Dragons 2011-07-12T00:00:00Z In the case of Cygnus X-l, this is about six times the mass of the sun, which, according to Chandrasekhar’s result, is too great for the unseen object to be a white dwarf. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z And even if every star managed to lose enough mass to avoid collapse, what would happen if you added more mass to a white dwarf or neutron star to take it over the limit? A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z There should therefore be, as there are, many cases of binary stars, one component a red giant, the other a white dwarf. Cosmos 1980-01-01T00:00:00Z A white dwarf is supported by the exclusion principle repulsion between the electrons in its matter. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z For white dwarfs, the pressure of the electrons, stripped from their nuclei, holds the star up. Cosmos 1980-01-01T00:00:00Z For this mechanism to work, the unseen object has to be very small, like a white dwarf, neutron star, or black hole. A Brief History of Time: And Other Essays 1988-01-01T00:00:00Z For half a heartbeat he thought he glimpsed Illyrio Mopatis, but it was only one of those white dwarf elephants passing the front door. A Dance with Dragons 2011-07-12T00:00:00Z "I am a white dwarf," her protagonist says. Sarah Gerard's debut, 'Binary Star,' radiates beauty 2015-01-08T05:00:00Z And the joke gets even lower if their father’s lover is a white dwarf. Film: Chris Rock Gives New Life to ?Death at a Funeral? 2010-04-09T15:31:00Z But, as night follows day, or as a planetary nebula becomes a white dwarf, it has its detractors. Brian Cox: Physics is better than rock'n'roll 2011-03-24T08:01:00Z For his 1977 museum show in Orange County, Eversley suggested that his series of black, white and gray mirrors alluded to the cosmological phenomena of black holes, white dwarfs and neutron stars. The Artist Who Throws Newton a Curve 2022-09-06T04:00:00Z The Queen of the Night, her glory reduced to a glimmer, is the white dwarf to Sarastro’s towering sun, a fabulous geriatric in a spangly dress who cannot move without assistance. Review: Pulling Back the Curtain on ‘The Magic Flute’ at the Met 2023-05-21T04:00:00Z Astronomers hypothesize that in the distant future – a thousand trillion years from now – the universe will go dark, inhabited by only stellar remnants like white dwarfs and black holes. Why Is the Sky Dark Even Though the Universe Is Full of Stars? 2023-10-19T04:00:00Z One of the stars expired long ago, blowing off its outer layers and becoming a dense and tiny white dwarf. The Sky Is Full of Stars—and Exoplanets, Too 2023-10-06T04:00:00Z And stars of middling mass, like our own, expand into a red giant, engulfing or scorching their planets and then dissipating to become a slow-cooling stellar ember called a white dwarf. Can Lucky Planets Get a Second Chance at Life? 2023-10-05T04:00:00Z Finally, when the white dwarf made its grand supernova exit, the pieces of star materials got thrown off at a high-velocity. Blast from the Past! 2023-03-21T04:00:00Z And it doesn’t end there: this ‘special radio broadcast’ might carry clues to solve a longtime puzzle - how white dwarfs really explode! Tune in to the Supernova Radio! 2023-06-08T04:00:00Z "White dwarfs form at the very end of a star's life. About 97% of all stars are destined to become white dwarfs when they die," Caiazzo said. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z Thermonuclear supernovae are explosive deaths of white dwarfs caused by runaway nuclear reactions. Some of Earth’s Most Famous Art Started with Stardust 2023-07-04T04:00:00Z For the former scenario, astronomers have been seeing signs of this demise in the atmospheres of white dwarfs: researchers have found such stars littered with the remnants of dead planets they likely swallowed. Can Lucky Planets Get a Second Chance at Life? 2023-10-05T04:00:00Z Image: A ring of glowing remains of the first-ever recorded supernova, a white dwarf star that exploded more than 1800 years ago. Blast from the Past! 2023-03-21T04:00:00Z Astronomers think that in the presence of a nearby star, the white dwarf ‘eats off’ material from the star’s outer layers, by a process called ‘accretion’. Tune in to the Supernova Radio! 2023-06-08T04:00:00Z After a white dwarf forms, its heavier elements are thought to sink to the star's core while its lighter elements - hydrogen being the lightest, followed by helium - float to the top. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z The other was an older star, a white dwarf burning helium. 8 Ursae Minoris b: Scientists unlock mystery of planet that escaped death 2023-06-28T04:00:00Z The researchers relied on measurements of 50 supernovae of a particular kind, known as type Ia: white dwarf stars that explode with an inherently predictable brightness. Euclid telescope to seek source of dark energy—the biggest mystery in the universe 2023-06-21T04:00:00Z But the long-lived remnants of dead stars such as white dwarfs and neutron stars—which have enormous mass—might have their life shortened if the phenomenon is real. This Is The Way The Universe Ends: By Evaporating 2023-06-22T04:00:00Z Eventually, the white dwarf reaches a very specific mass, until it can eat no more and explode. Tune in to the Supernova Radio! 2023-06-08T04:00:00Z This layered structure is believed to be destroyed at a certain stage in the evolution of some white dwarfs when a strong mixing blends the hydrogen and helium together. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z This mechanism is compatible with observations of the spin rates of neutron stars and white dwarfs. Scientists Solve Star Spin Mystery 2023-06-16T04:00:00Z Limbach’s proposals are focused on white dwarfs, the remnant Earth-sized cores left behind after stars such as our sun swell into red giants and expel their outer layers. JWST Will Hunt for Dead Solar Systems—and Much More—in Its Second Year of Science 2023-05-18T04:00:00Z Novas are stellar explosions that can happen when a red giant pours fuel onto a companion white dwarf star. Astronomers Just Saw a Star Eat a Planet for the First Time 2023-05-03T04:00:00Z Researchers think that when a white dwarf explodes, the shock waves from the supernova explosion passing through this cloud will give the surrounding materials a lot of energy that they release strong radio waves. Tune in to the Supernova Radio! 2023-06-08T04:00:00Z Janus may represent a white dwarf in the midst of this transitional blending process, but with the puzzling development of one side being hydrogen while the other side is helium. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z But it is different from the previously favoured scenario, in which a white dwarf siphons material from a companion. Weird Supernova Remnant Blows Scientists’ Minds 2023-02-01T05:00:00Z Limbach will attempt to confirm two suspected white dwarf worlds but will also search for up to a half dozen more elsewhere in the sky. JWST Will Hunt for Dead Solar Systems—and Much More—in Its Second Year of Science 2023-05-18T04:00:00Z And when stars die, their core shrinks again as they burn off their fuel and begin to collapse into a white dwarf, a neutron star or even a black hole in a supernova explosion. Star Cores Spin Surprisingly Slowly—Scientists Now Think They Know Why 2023-01-24T05:00:00Z There are other weird, solid stars called white dwarfs, but this material is still very unlike the solid matter on Earth. A weird, dead magnetized star has a solid surface — and a ring 2023-01-09T05:00:00Z "Many white dwarfs are expected to go through this transition, and we might have caught one in the act because of its magnetic field configuration," Caiazzo said. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z While white dwarfs are known, old dim ones are not. College Physics for AP Courses 2015-08-12T00:00:00Z Both the hottest white dwarfs and main-sequence O stars have temperatures hotter than 25,000 K. Which type of star can ionize more hydrogen? Astronomy 2016-10-13T00:00:00Z One day, he says, our home star will collapse to a white dwarf with the same diameter as our planet. Star Cores Spin Surprisingly Slowly—Scientists Now Think They Know Why 2023-01-24T05:00:00Z The instabilities that arise from this exchange can throw the star so off-kilter that it ejects its stellar atmosphere into space and subsequently collapses into a dead white dwarf. The Juicy Secrets of Stars That Eat Their Planets 2022-08-19T04:00:00Z Caiazzo was part of a research team that in 2021 reported on one with a petite diameter slightly larger than Earth's moon that boasted the greatest mass and littlest size of any known white dwarf. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z Before becoming a white dwarf, the star was much like our sun. Behold, Some Hidden Gems from JWST’s First Images 2022-07-21T04:00:00Z As a result, in white dwarfs, the nuclei do not exhibit degeneracy pressure. Astronomy 2016-10-13T00:00:00Z When a dying star sheds its outer layers and becomes a white dwarf, the released gases become ionized and emit light. Here's what the James Webb Space Telescope has seen in just a week of looking 2022-07-12T04:00:00Z This sequence could explain “confusing” observations of planets in close orbits around white dwarfs, Mr. Yarza said. The Juicy Secrets of Stars That Eat Their Planets 2022-08-19T04:00:00Z Janus is fairly massive for a white dwarf, with a mass 20% larger than that of our sun compressed into an object with a diameter half that of Earth. Introducing Janus, the exotic 'two-faced' white dwarf star 2023-07-21T04:00:00Z Now a small white dwarf, the star that caused all this commotion was a star about the size of our Sun. Here’s how the first images from the James Webb Space Telescope stack up to Hubble’s epic shots 2022-07-12T04:00:00Z Hence, in the white dwarf stage of stellar evolution, it is the degeneracy pressure of the electrons, and not of the nuclei, that halts the collapse of the core. Astronomy 2016-10-13T00:00:00Z For the first time, Webb was able to unshroud the white dwarf — which appears as the red dot in the picture above — from the dust that surrounds it. Here's what the James Webb Space Telescope has seen in just a week of looking 2022-07-12T04:00:00Z Following their deaths, stars like the Sun turn into white dwarfs. An Introduction to Geology 2017-01-01T00:00:00Z Such “gravitational glints” might serve as a kind of radar to detect white dwarfs, neutron stars, and other stellar corpses that are difficult to see beyond our galaxy. Gravitational wave radar could probe deep space for tiny stellar objects 2022-06-23T04:00:00Z As its name implies, a micronova is believed to occur on the surface of small, dense stars known as white dwarf stars. A supernova in miniature: Bizarre "micronovas" are exploding in small stars, astronomers say 2022-04-25T04:00:00Z According to the best theoretical models, a white dwarf with a mass of about 1.4 MSun or larger would have a radius of zero. Astronomy 2016-10-13T00:00:00Z Specifically, micronovae occur on a type of zombie star known as a white dwarf. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z "In the original paper we considered a habitable planet around a white dwarf; the new paper considers habitable planets around an M-dwarf which are supposed to be more challenging targets." Why scientists think we could find extraterrestrial intelligence by searching for pollutants 2022-02-28T05:00:00Z They consider a compact object such as a white dwarf or a neutron star that lies close to, but not directly on the line of sight to the merging black holes. Gravitational wave radar could probe deep space for tiny stellar objects 2022-06-23T04:00:00Z In sifting through this data, the researchers discovered a brief flash of light from a white dwarf star. A supernova in miniature: Bizarre "micronovas" are exploding in small stars, astronomers say 2022-04-25T04:00:00Z It was during the long boat voyage to get to graduate school that he first began doing calculations about the structure of white dwarf stars. Astronomy 2016-10-13T00:00:00Z Scaringi is mostly interested in studying white dwarfs, especially those that have neighboring stars close by. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z "This is the first time that anything has been seen in the habitable zone of a white dwarf. And thus there is a possibility of life on another world orbiting it," he told BBC News. Life could exist on planet orbiting 'white dwarf' star 2022-02-11T05:00:00Z It also perhaps could be another type of dead star called a white dwarf or something completely unknown, Hurley-Walker said. Scientists amazed by blinking star's 'totally unexpected' behavior 2022-01-27T05:00:00Z "The hydrogen fuel can be contained at the base of the magnetic poles of some white dwarfs, so that fusion only happens at these magnetic poles." A supernova in miniature: Bizarre "micronovas" are exploding in small stars, astronomers say 2022-04-25T04:00:00Z Now the star is a true white dwarf: nuclear fusion in its interior has ceased. Astronomy 2016-10-13T00:00:00Z The binary stars that Scaringi studies consist of a white dwarf orbiting around a star like our Sun. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z The research team do not have direct evidence of the planet's existence - but the movements of 65 Moon-sized structures orbiting the white dwarf's habitable zone, suggest it is there. Life could exist on planet orbiting 'white dwarf' star 2022-02-11T05:00:00Z Theories around what the object might be include a neutron star or a white dwarf - a term used for the remnants of a collapsed star. Australia scientists find 'spooky' spinning object in Milky Way 2022-01-27T05:00:00Z After expansion, the sun will contract until it becomes a white dwarf, at which point it will no longer produce any heat of its own, and rather will slowly cool for all eternity. Astronomers observe a distant solar system that looks a lot like ours will after the sun explodes 2021-10-20T04:00:00Z All stars that have masses below the Chandrasekhar limit when they run out of fuel will become white dwarfs, no matter what mass they were born with. Astronomy 2016-10-13T00:00:00Z When this configuration occurs, the super dense white dwarf will actually act almost like a vacuum; its huge gravitational pull will start sucking up hydrogen from the nearby star. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z If confirmed, this would be the first time that a potentially life-supporting planet has been found orbiting such a star, called a "white dwarf". Life could exist on planet orbiting 'white dwarf' star 2022-02-11T05:00:00Z When our sun enters its death throes in about 5 billion years, it will incinerate our planet and then dramatically collapse into a dead ember known as a white dwarf. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z Using the W. M. Keck Observatory in Hawaii, astronomers observed a Jupiter-like planet that is revolving around a white dwarf near the center of the Milky Way. Astronomers observe a distant solar system that looks a lot like ours will after the sun explodes 2021-10-20T04:00:00Z Suppose we find a cluster that has a white dwarf member and also contains stars on the main sequence that have 6 times the mass of the Sun. Astronomy 2016-10-13T00:00:00Z Eventually, the entire surface of the white dwarf will be covered in a layer of hydrogen. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z The results should act as a spur for astronomers to actively search for direct evidence of planets around white dwarfs. Life could exist on planet orbiting 'white dwarf' star 2022-02-11T05:00:00Z On Wednesday in the journal Nature, astronomers reported observing a tantalizing preview of our solar system’s afterlife: a Jupiter-size planet orbiting a white dwarf some 6,500 light years from here. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z From there, it collapses into a very faint white dwarf. Astronomers observe a distant solar system that looks a lot like ours will after the sun explodes 2021-10-20T04:00:00Z This means that only those stars with masses greater than 6 MSun have had time to exhaust their supply of nuclear energy and complete their evolution to the white dwarf stage. Astronomy 2016-10-13T00:00:00Z The white dwarf still remains once the event is over, but the layer of hydrogen it stole burns away. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z As darkness settled in, a small crowd of visitors gathered around and Mr. Bohley lifted his eyes upward, guiding them to planets and galaxies, white dwarfs and red giants. Where Dark Skies Draw Star-Gazers, Wildfire Smoke Spoils the View 2021-08-13T04:00:00Z “The sun will become a white dwarf, the inner planets will be engulfed, and the wider-orbit planets like Jupiter and Saturn will survive.” Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z The small size of white dwarfs is partly why it has been so difficult to detect a planetary system orbiting a white dwarf until now. Astronomers observe a distant solar system that looks a lot like ours will after the sun explodes 2021-10-20T04:00:00Z Such mass transfer can be especially dramatic when the recipient is a stellar remnant such as a white dwarf or a neutron star. Astronomy 2016-10-13T00:00:00Z An artistic impression of a white dwarf in a binary system, where a micronova might occur. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z After accreting its neighbors' matter for years, the dead white dwarf star may spontaneously start fusion up again, which often triggers a supernova. The discovery of a new type of supernova explains a stellar explosion from A.D. 1054 2021-06-29T04:00:00Z After searching for years for its host star with the Keck II telescope in Hawaii, Blackman and his colleagues concluded it was orbiting a white dwarf that is too faint to directly observe. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z This helped rule out the possibility of the host star being anything besides a white dwarf. Astronomers observe a distant solar system that looks a lot like ours will after the sun explodes 2021-10-20T04:00:00Z In fact, quite to the contrary, novae originate from white dwarfs, which are actually the endpoint of stellar evolution for low-mass stars. Astronomy 2016-10-13T00:00:00Z The team noticed that one white dwarf would brighten for a short amount of time — just 10 hours or so. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z At best, then, in this extended metaphor he was an odd star, a white dwarf or a neutron. Formation of a black hole: On the spectacular implosion of the Republican Party 2021-05-22T04:00:00Z But MOA-2010-BLG-477Lb circles its hidden stellar husk at nearly 3 times the distance between Earth and the sun, making it the first known planet to occupy a Jupiter-like orbit around a white dwarf. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z Stars like our sun create energy through thermonuclear reactions and, when they die, become "white dwarf" stars. Neutron stars are very, very weird — and we just learned a fascinating new detail about them 2021-04-30T04:00:00Z The fusion energy produced during the final explosion is so great that it completely destroys the white dwarf. Astronomy 2016-10-13T00:00:00Z Then the team noticed the same short brightening events happen with two other white dwarfs, also in binary systems. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z This remnant object, called a white dwarf, begins to cool, eventually freezing into a gigantic solid crystal over billions of years. Some dead stars may harbor enough uranium to set off a thermonuclear bomb 2021-03-18T04:00:00Z He also noted that planets with wide orbits around white dwarfs are probably more abundant than those in tight orbits, but that the latter group are simpler to detect. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z The rest of the dark material would be remnants of dead stars, such as white dwarfs or neutron stars. Hunting for a Giant Black Hole, Astronomers Found a Nest of Darkness 2021-02-26T05:00:00Z Gases are blown out into space at velocities of about 10,000 kilometers per second, and afterward, no trace of the white dwarf remains. Astronomy 2016-10-13T00:00:00Z They realized that all three of these white dwarfs had very intense magnetic fields. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z Still, not much is known about the internal composition of white dwarfs, so it’s unclear whether they contain enough uranium-235 to trigger an explosion, Tremblay says. Some dead stars may harbor enough uranium to set off a thermonuclear bomb 2021-03-18T04:00:00Z The new discoveries can yield insights about the search for extraterrestrial life and the potential habitability of white dwarf systems. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z The outer layers of the star separate while the center falls inward, transforming into a white dwarf. Unrivaled View of Brilliant ‘Planetary Nebula’ NGC 2899 2021-01-15T05:00:00Z The white dwarf then begins to attract material from its companion, which in turn evolves to become a red giant. Astronomy 2016-10-13T00:00:00Z The team wondered if the hydrogen that the white dwarfs were pulling off of their neighboring stars was getting funneled onto the stars’ magnetic poles. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z Most likely, there are rocky, Earth-size planets at similar distances from other white dwarfs—in which case they would possess a surface temperature similar to that of Earth. Living near a White Dwarf 2020-10-27T04:00:00Z But there are some speculative scenarios that might preserve the habitability of white dwarf systems. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z The planet is roughly 20 times closer to the white dwarf than is Mercury to the Sun. Daily briefing: Genes map how the Vikings spread across Europe 2020-09-17T04:00:00Z Eventually, the white dwarf acquires so much mass that it is pushed over the Chandrasekhar limit and becomes a type Ia supernova. Astronomy 2016-10-13T00:00:00Z Scaringi’s team thinks something similar is happening with these white dwarfs, just with much more explosive effects. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z Seven billion years later, the core of the sun will shrink to its remnant, a white dwarf, carrying about half of the solar mass with the rest lost. Living near a White Dwarf 2020-10-27T04:00:00Z Because white dwarfs are small and dim, such a planet would have to be in a very close orbit for liquid water to exist. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z “The white dwarf creation process destroys nearby planets, and anything that later gets too close is usually torn apart by the star’s immense gravity,” Vanderburg said. Scientists Spot Giant Planet Orbiting Dead Star’s Corpse 2020-09-17T04:00:00Z However, unlike the explosion of a high-mass star, which can leave behind a neutron star or black hole remnant, the white dwarf is completely destroyed in the process, leaving behind no remnant. Astronomy 2016-10-13T00:00:00Z The white dwarfs’ magnetic fields direct the material streaming off its companion toward very small regions near the poles. "Micronova" explosions spotted on distant zombie stars 2022-04-20T04:00:00Z After a few billion years, a white dwarf cools to a surface temperature similar to that of the present-day sun. Living near a White Dwarf 2020-10-27T04:00:00Z As more intact planets are spotted orbiting white dwarfs, scientists will gain a clearer picture of the life, and afterlife, of these mysterious systems. Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z Red giants eventually collapse into white dwarfs, which typically pack the mass of our sun into a sphere only slightly bigger than Earth. Scientists Spot Giant Planet Orbiting Dead Star’s Corpse 2020-09-17T04:00:00Z The two white dwarfs may have unstable orbits, such that over time, they would slowly move closer together until they merge. Astronomy 2016-10-13T00:00:00Z When the last of the envelope is ejected, the Sun’s core will be revealed: a smouldering, Earth-sized white dwarf that will slowly cool for the rest of time. Planet discovered transiting a dead star 2020-09-15T04:00:00Z For the economy, the white dwarf surface would offer the efficiency of nuclear reactors without creating radioactive waste. Living near a White Dwarf 2020-10-27T04:00:00Z “This is the first detection of a planet orbiting a white dwarf made using the microlensing technique,” Blackman concluded, “but almost certainly not the last.” Astronomers found a planet that survived its star’s death 2021-10-18T04:00:00Z Enter another way to blow up a white dwarf. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z We saw that stars whose core masses are less than 1.4 MSun at the time they run out of fuel end their lives as white dwarfs. Astronomy 2016-10-13T00:00:00Z More broadly, we might expect many white dwarfs to host remnant planetary systems. Planet discovered transiting a dead star 2020-09-15T04:00:00Z Given this perspective, there might already be analogs of our civilization that recognized the benefits of living around white dwarfs. Living near a White Dwarf 2020-10-27T04:00:00Z Cheops will look at a burnt-out, or white dwarf, star to see if there is any planetary material moving around it. Cheops telescope begins study of far-off worlds 2020-04-16T04:00:00Z In a 2018 study, Maoz and his colleagues looked for the wobble of white dwarfs being tugged by a partner, combining survey results from the Sloan Digital Sky Survey and Europe’s Very Large Telescope. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z The pressure exerted by degenerate electrons keeps white dwarfs from contracting to still-smaller diameters. Astronomy 2016-10-13T00:00:00Z This dimming is caused by a planet passing between the white dwarf and Earth. Planet discovered transiting a dead star 2020-09-15T04:00:00Z According to a University of Sheffield blog post, this particular white dwarf is made mostly of helium, unlike most white dwarfs. Pulsating remains of star discovered by scientists 2020-03-16T04:00:00Z The star, known as WDJ0551+4135, is believed to be the first massive white dwarf star comprised of two white dwarfs. Massive white dwarf star 150 light-years away doesn't 'make any sense,' experts say 2020-03-03T05:00:00Z In fact, many believe nature has found a way to blow up one member of a white dwarf pair—but without a merger. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Eventually, white dwarfs cool off to become black dwarfs, stellar remnants made mainly of carbon, oxygen, and neon. Astronomy 2016-10-13T00:00:00Z Because white dwarfs are so small, the planetary transit is very ‘deep’: 56% of the white dwarf’s light is blocked, compared with the typical 1–2% that is blocked by gas-giant planets around normal stars. Planet discovered transiting a dead star 2020-09-15T04:00:00Z The next step of the research is to continue observing the white dwarf to record as many pulsations as possible using HiPERCAM and the Hubble Space Telescope. Pulsating remains of star discovered by scientists 2020-03-16T04:00:00Z WDJ0551+4135 is one of just a handful of merged white dwarf stars in the known universe and the only one with its particular composition. Massive white dwarf star 150 light-years away doesn't 'make any sense,' experts say 2020-03-03T05:00:00Z So far, astronomers can’t say how many of their favorite cosmic explosions are sparked by white dwarf pairs rather than a giant and a dwarf. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z When a white dwarf or neutron star is a member of a close binary star system, its companion star can transfer mass to it. Astronomy 2016-10-13T00:00:00Z The white dwarf was previously a giant star, the outer envelope of which once extended well beyond the planet’s orbit. Planet discovered transiting a dead star 2020-09-15T04:00:00Z The death dance of a white dwarf star and a pulsar reveal relativistic frame dragging — also known as the Lense-Thirring effect — in which a fast-spinning object distorts the fabric of space-time around it. Daily briefing: Genetically engineered gut microbes can protect honey bees 2020-01-30T05:00:00Z "There aren't that many white dwarfs this massive, although there are more than you would expect to see, which implies that some of them were probably formed by mergers," Hollands explained. Massive white dwarf star 150 light-years away doesn't 'make any sense,' experts say 2020-03-03T05:00:00Z Astronomers know that two white dwarfs orbiting each other—a so-called double degenerate—can gradually spiral inward as their rapid orbits throw out gravitational waves, which carry away energy. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Material falling gradually onto a white dwarf can explode in a sudden burst of fusion and make a nova. Astronomy 2016-10-13T00:00:00Z One of the biggest questions to emerge from Vanderburg and colleagues’ study is how the planet ended up so close to the white dwarf. Planet discovered transiting a dead star 2020-09-15T04:00:00Z The white dwarf orbits so quickly that it’s year is only about five hours long — reaching orbital speeds of up to a million kilometres per hour. Daily briefing: Genetically engineered gut microbes can protect honey bees 2020-01-30T05:00:00Z In other words, the drift was partially because of the pulsar tumbling as it was dragged along in the swirl of spacetime surrounding its white dwarf companion. Bizarre Cosmic Dance Offers Fresh Test for General Relativity 2020-01-30T05:00:00Z Gaensicke and his colleagues suspected these burnt-out embers were fleeing scenes of violence: supernova explosions in which another white dwarf had detonated like an Earth-size hydrogen bomb. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z If material falls rapidly onto a white dwarf, it can push it over the Chandrasekhar limit and cause it to explode completely as a type Ia supernova. Astronomy 2016-10-13T00:00:00Z According to NASA, the star system, which consists of a white dwarf star and its much smaller brown dwarf companion, was seen brightening by a factor of 1,600 over less than a day. 'Vampire' star spotted by NASA’s planet-hunting Kepler space telescope 2020-01-27T05:00:00Z The white dwarf is the size of Earth and the pulsar is the size of a city — but both contain more mass than the Sun. Daily briefing: Genetically engineered gut microbes can protect honey bees 2020-01-30T05:00:00Z When a dense stellar core called a white dwarf acquires enough material from a companion star orbiting nearby, it burns up in the nuclear fusion blast of a Type Ia supernova. Mapping the Remains of Supernovae 2019-12-27T05:00:00Z But the extreme speed of the white dwarfs suggested a different scenario, in which the fleeing dwarfs had delivered the sparks, from close orbits around the doomed stars. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Another possible mechanism for a type Ia supernova is the merger of two white dwarfs. Astronomy 2016-10-13T00:00:00Z Using observational data and theoretical models, the researchers believe this white dwarf is 28,000 degrees Celsius, around five times the Sun's temperature. A dissolving exoplanet prophesies our solar system's final days 2019-12-08T05:00:00Z The team's follow-up observations, published in a new study in Nature, showed the presence of hydrogen, oxygen and sulphur associated with the white dwarf. First giant planet around white dwarf discovered by scientists 2019-12-04T05:00:00Z As it expands, it will swallow and destroy the Earth before collapsing into a small core called a white dwarf. Distant star's vision of our Sun's future 'death' 2019-12-04T05:00:00Z From the color and brightness of the light, the astronomers could deduce that the stars were hotter and larger than typical white dwarfs, as if they had been puffed up by a sudden energy boost. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z What will happen to stars like our Sun between the main sequence and the white dwarf stages. Astronomy 2016-10-13T00:00:00Z The planet orbiting it is at least twice the size of the white dwarf. A dissolving exoplanet prophesies our solar system's final days 2019-12-08T05:00:00Z Being able to adjust our distance from the “furnace” based on its changing brightness would be most helpful towards the end, when the sun will reverse course and dim considerably, turning into a white dwarf. What Will We Do When the Sun Gets Too Hot for Earth's Survival? 2019-11-25T05:00:00Z In addition, he said: "The gravitational forces are very large so if a body gets too close to a white dwarf, like an asteroid, the gravity is so strong the asteroid would be ripped apart." Distant star's vision of our Sun's future 'death' 2019-12-04T05:00:00Z He says the classic scenario of a white dwarf paired with a large star such as a red giant “doesn’t happen in nature, or quite rarely.” The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Describe the evolution of a white dwarf over time, in particular how the luminosity, temperature, and radius change. Astronomy 2016-10-13T00:00:00Z The planet orbits the white dwarf in just about 10 days. A dissolving exoplanet prophesies our solar system's final days 2019-12-08T05:00:00Z Their work focused on small, dense stars called white dwarfs as they explode into supernovae, but the new model also applies to chemical explosions on Earth. Budding Organs, Science on Blast(s), and Human-Robot Synchronicity: Science GIFs to Start Your Week 2019-11-04T05:00:00Z But the radiation emitted by the Sun, once it becomes a white dwarf, will be powerful enough to evaporate the atmospheres of Jupiter, Saturn and Uranus where they are orbiting now. Distant star's vision of our Sun's future 'death' 2019-12-04T05:00:00Z These, they proposed, were forged in a white dwarf that had grown to a size at which the pressure and temperature in its core would be high enough to fuse carbon, causing a thermonuclear blast. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Would you expect to find any white dwarfs in the Orion Nebula? Astronomy 2016-10-13T00:00:00Z The research provides insight into how planets, such as those in our own solar system, will transform throughout our sun's inevitable transition to a white dwarf. A dissolving exoplanet prophesies our solar system's final days 2019-12-08T05:00:00Z Doyle analyzed the elements in rocks from asteroids, or rocky planet fragments, orbiting six white dwarf stars. Earth-like exoplanets may be common in the universe, study suggests 2019-10-17T04:00:00Z A white dwarf is the burned-out core of a sun-like star. Planetary 'autopsies' indicate worlds like Earth common in the cosmos 2019-10-17T04:00:00Z If it accumulates too slowly, the white dwarf can tiptoe up to a mass 1.44 times that of the Sun. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z The paperweight in our analogy might be a white dwarf or a neutron star. Astronomy 2016-10-13T00:00:00Z Researchers believe that once the host star became a white dwarf, the planet moved closer to it. A dissolving exoplanet prophesies our solar system's final days 2019-12-08T05:00:00Z The scientists used calculations and formulas since they're unable to study actual rocks from white dwarfs. Earth-like exoplanets may be common in the universe, study suggests 2019-10-17T04:00:00Z The closest of the six white dwarf stars is about 200 light-years from Earth. Planetary 'autopsies' indicate worlds like Earth common in the cosmos 2019-10-17T04:00:00Z It leaves the smaller white dwarf battered but thrown free, like those Shen’s group found in the Gaia data. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z The X-ray-emitting point sources are white dwarfs, neutron stars, and stellar black holes. Astronomy 2016-10-13T00:00:00Z “I hope they will find real planets orbiting white dwarfs next.” A dissolving exoplanet prophesies our solar system's final days 2019-12-08T05:00:00Z While the fantastical environments of black holes, white dwarfs and dark matter often took center stage, at the heart of each discovery was the human mind seeking to understand the unfamiliar. How Mere Humans Manage to Comprehend the Vastness of the Universe 2019-10-11T04:00:00Z For example, the oldest stars in the disk of the Milky Way galaxy are about nine billion years old—an estimate derived from the rate of cooling of white dwarf stars. The Evolution of the Universe 2019-10-08T04:00:00Z If type Ia supernovae originate as paired white dwarfs, their brightness might not be as consistent as was thought—and they might be less reliable as standard candles. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Now calculate the radius of Sirius’ white dwarf companion, Sirius B, to the Sun. Astronomy 2016-10-13T00:00:00Z And in the 1940s, his search with Milton Humason for white dwarfs — another class of dense stellar remnants — gave early hints of the highly energetic outbursts that came to be known as quasars. Deciphering dark matter: the remarkable life of Fritz Zwicky 2019-09-02T04:00:00Z It becomes further apparent when we are confronted with counterintuitive phenomena like white dwarfs and black holes. How Mere Humans Manage to Comprehend the Vastness of the Universe 2019-10-11T04:00:00Z "Also, if the magnetic field is too strong, it would push the core into the white dwarf, destroying it," Veras continued. Dead planets can 'broadcast' their 'zombie signals' for almost a billion years, study says 2019-08-09T04:00:00Z But if the white dwarf orbits in a binary pair with another star, a more spectacular fate may await it. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z As fresh hydrogen from the outer layers of its companion accumulates on the surface of the hot white dwarf, it begins to build up a layer of hydrogen. Astronomy 2016-10-13T00:00:00Z So Riess and his colleagues instead use the apparent brightness of supernovae produced by exploding white dwarf stars, which they compare to the supernovae’s intrinsic luminosity to find distance. Hubble Tension Headache: Clashing Measurements Make the Universe's Expansion a Lingering Mystery 2019-07-29T04:00:00Z This method shows more promise, Wong says, because the gravitational waves produced by white dwarf binaries are so much stronger than those made by a planet twirling around a lone star. Future Gravitational Wave Detectors Could Find Exoplanets, Too 2019-07-08T04:00:00Z "Hence, we should only look for planets around those white dwarfs with weaker magnetic fields at a separation between about 3 solar radii and the Mercury-Sun distance." Dead planets can 'broadcast' their 'zombie signals' for almost a billion years, study says 2019-08-09T04:00:00Z At that threshold, known as the Chandrasekhar limit, theorists predict the pressure inside will cause electrons and protons to fuse into neutrons, and the white dwarf will quietly collapse into a neutron star. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z The more massive star evolves first to become a red giant and then a white dwarf. Astronomy 2016-10-13T00:00:00Z Now it circles the white dwarf so closely that it completes an orbit every 123 minutes. Apocalypse Next? Astronomers Find a Chunk of Planet Around a Distant, Dead Star 2019-04-04T04:00:00Z But before a star becomes a white dwarf, it first goes through a red giant phase in which it balloons in size, swelling to scorch or even swallow any close-in planets. Future Gravitational Wave Detectors Could Find Exoplanets, Too 2019-07-08T04:00:00Z As the gas—including the calcium ions—zips around the white dwarf, its light gets Doppler shifted to slightly higher frequencies when moving toward Earth and lower frequencies when moving away. Astronomers spy an iron planet stripped of its crust around a burned-out star 2019-04-04T04:00:00Z The speeds of the three white dwarfs, discovered in a 2018 data set from Europe’s Gaia satellite, were just one clue to this picture. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z We call these white dwarf explosions type Ia supernovae. Astronomy 2016-10-13T00:00:00Z “So if the sun was positioned where the white dwarf is, the planetesimal would be orbiting within the sun,” said Dr. Manser. Apocalypse Next? Astronomers Find a Chunk of Planet Around a Distant, Dead Star 2019-04-04T04:00:00Z Consequently, Wong says, any surviving worlds will probably be uninhabitable—and those producing the strongest gravitational-wave signals will be uncomfortably close to their white dwarf hosts. Future Gravitational Wave Detectors Could Find Exoplanets, Too 2019-07-08T04:00:00Z Any object that close to a white dwarf would normally be torn apart. Astronomers spy an iron planet stripped of its crust around a burned-out star 2019-04-04T04:00:00Z They concluded that about half a billion white dwarf binaries have merged in the Milky Way since its formation. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z However, as we learned earlier, hydrogen is absent from the white dwarf remnant, which is primarily composed of carbon and oxygen for masses comparable to the Chandrasekhar mass limit. Astronomy 2016-10-13T00:00:00Z It is one of a handful of white dwarfs known to be encircled by disks of debris. Apocalypse Next? Astronomers Find a Chunk of Planet Around a Distant, Dead Star 2019-04-04T04:00:00Z The white dwarf’s three-million-kilometer-wide debris disk was first discovered more than 15 years ago, making the star one of fewer than a dozen polluted white dwarfs known to be surrounded by disks. A Heavy-Metal Planet Orbiting a Dead Star May Foretell Our World's End 2019-04-04T04:00:00Z Many theorists initially put forward models based on the violent collapse or merger of compact objects, including white dwarfs, neutron stars, pulsars, and black holes. A homespun Canadian telescope could explain mysterious radio signals from the distant universe 2019-03-14T04:00:00Z One key feature of the D6 scenario is that the exploding white dwarf can be well below the critical mass, because the spark comes from a shock wave and not from gravitational pressure. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z Perhaps even more puzzling is that, so far, astronomers have not been able to identify the companion star feeding the white dwarf in any of these historical supernovae. Astronomy 2016-10-13T00:00:00Z Nor is there better news to be found elsewhere around the white dwarf. Apocalypse Next? Astronomers Find a Chunk of Planet Around a Distant, Dead Star 2019-04-04T04:00:00Z Perhaps, however, similar objects await discovery around other white dwarfs. A Heavy-Metal Planet Orbiting a Dead Star May Foretell Our World's End 2019-04-04T04:00:00Z Millions of years ago, a white dwarf—the fading cinder of a sunlike star—was locked in a dizzying dance with a bright companion star. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z The rest are all type Ia—white dwarf stars somehow reignited into a runaway fusion reaction. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z All proposed mechanisms rely upon white dwarfs composed of carbon and oxygen, which are needed to meet the observed absence of hydrogen in the type Ia spectrum. Astronomy 2016-10-13T00:00:00Z “We are confident that we will discover additional planetesimals orbiting white dwarfs, which will allow us to learn more about their general properties,” Dr. Manser said. Apocalypse Next? Astronomers Find a Chunk of Planet Around a Distant, Dead Star 2019-04-04T04:00:00Z "The team looked at it together, and we determined it was likely a white dwarf with infrared excess." Searching for Planet Nine, scientist finds ancient star with mysterious rings 2019-02-20T05:00:00Z But against all odds, the explosion did not fully rupture the white dwarf. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z But if the hydrogen is added at just the right rate, a white dwarf, especially one rich in carbon and oxygen, can respond more dramatically. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z And because any isolated white dwarf below the Chandrasekhar mass is stable, all proposed mechanisms invoke a binary companion to explode the white dwarf. Astronomy 2016-10-13T00:00:00Z An alternative explanation suggests that the Cow came from a tidal disruption event — the dazzling destruction of a white dwarf star that passed too close to an incredibly massive black hole. Scientists had never seen anything like this supernova. Could it be a newborn black hole? 2019-01-11T05:00:00Z One possibility was a white dwarf—the burnt out remnant of a star--consuming material from a companion star, and sporadically flaring up in the process. Astronomers still can't decipher the ‘Cow’, a mysterious explosion in deep space 2019-01-11T05:00:00Z Whereas typical white dwarfs comprise carbon and oxygen, these stars are mostly composed of neon. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z If they all originate from a white dwarf and a red giant, the galaxy would have to host some 10,000 of these pairs—and there’s little evidence of them. The galaxy’s brightest explosions go nuclear with an unexpected trigger: pairs of dead stars 2020-06-04T04:00:00Z The leading alternative mechanism scientists believe creates a type Ia supernova is the merger of two white dwarf stars in a binary system. Astronomy 2016-10-13T00:00:00Z "This is the first direct evidence that white dwarfs crystallize, or transition from liquid to solid," Dr. Pier-Emmanuel Tremblay from the University of Warwick's Department of Physics said in a statement. The Sun will become a giant crystal ball when it dies 2019-01-10T05:00:00Z But analysis of AT2018cow’s light spectrum soon showed that the object was too far away, in another galaxy—a flaring white dwarf would never be visible at that distance. Astronomers still can't decipher the ‘Cow’, a mysterious explosion in deep space 2019-01-11T05:00:00Z Those heavy elements are the by-products of a star’s advanced stages of burning its nuclear fuel, which suggests that even though these white dwarfs did not fully disintegrate, their outer layers did partially burn. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z If it is a white dwarf, then the two stars will spiral toward each other and collide in a violent explosion. Caught in the Act--Astronomers Get Their Best Look Yet at a Supernova Blowing Up 2018-12-17T05:00:00Z What is the acceleration of gravity at the surface of the white dwarf? Astronomy 2016-10-13T00:00:00Z Data was compiled by the European Space Agency's Gaia and analyzed over a span of five years, looking at approximately 15,000 white dwarfs within close proximity to the Sun, approximately 330 light-years away. The Sun will become a giant crystal ball when it dies 2019-01-10T05:00:00Z If the neutron star and the inner white dwarf were to fall with different accelerations towards the outer white dwarf, there would be a tiny deformation of the inner orbit. General relativity verified by a triple-star system 2018-07-03T04:00:00Z As a white dwarf siphons matter from a companion star, it grows both heavier and denser. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z His team argues it is caused by a blob of radioactive material at the surface of one of the white dwarfs that glows prior to the supernova’s peak brightness—thus explaining the early light bump. Caught in the Act--Astronomers Get Their Best Look Yet at a Supernova Blowing Up 2018-12-17T05:00:00Z What is the escape velocity from the white dwarf in Exercise 23.35? Astronomy 2016-10-13T00:00:00Z The data found a "pile-up," or a rather larger number of white dwarfs with "specific colors and luminosities that do not correspond to any single mass or age." The Sun will become a giant crystal ball when it dies 2019-01-10T05:00:00Z In Einstein’s theory, all bodies — hammers, feathers, planets, neutron stars, white dwarfs and even black holes — fall with the same acceleration. General relativity verified by a triple-star system 2018-07-03T04:00:00Z Eventually the density is so high carbon nuclei within the white dwarf fuse together, allowing the star to build heavier elements for roughly a thousand years. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z One white dwarf and the pulsar are orbiting each other every 1.6 days. Triple-Star Test Shows Einstein Was Right, Again 2018-07-05T04:00:00Z What is the average density of the white dwarf in Exercise 23.35? Astronomy 2016-10-13T00:00:00Z One classic model suggests some Type Ia blasts occur when two white dwarfs spiral toward each other and merge. The Milky Way's Speediest Stars Could Solve a 50-Year-Old Mystery 2018-05-09T04:00:00Z In one scenario, the white dwarf steals material from an ordinary star. One of the Milky Way’s fastest stars is an invader from another galaxy 2018-05-08T04:00:00Z This story explains the three newfound white dwarfs quite nicely, albeit with one major caveat: The stars should host some carbon that did not burn in the conflagration. Zombie Stars Shine on after Mystery Detonations 2019-02-21T05:00:00Z In turn they also orbit around the other white dwarf every 327 days. Triple-Star Test Shows Einstein Was Right, Again 2018-07-05T04:00:00Z How does this radius compare with that of a typical white dwarf? Astronomy 2016-10-13T00:00:00Z From the Gaia data Shen’s team flagged seven candidate hypervelocity white dwarf stars. The Milky Way's Speediest Stars Could Solve a 50-Year-Old Mystery 2018-05-09T04:00:00Z Within 24 hours, Shen’s team found three white dwarfs that might fit the bill. One of the Milky Way’s fastest stars is an invader from another galaxy 2018-05-08T04:00:00Z Most of the X-ray sources are binaries that contain a white dwarf as the companion. Bounteous black holes at the Galactic Centre 2018-04-15T04:00:00Z Of course, the pulsar and white dwarf are very massive objects themselves, with strong self gravity. Triple-Star Test Shows Einstein Was Right, Again 2018-07-05T04:00:00Z If the Sun were replaced by a white dwarf with a surface temperature of 10,000 K and a radius equal to Earth’s, how would its luminosity compare to that of the Sun? Astronomy 2016-10-13T00:00:00Z Piro says the three hypervelocity white dwarfs from Gaia’s data boost the odds Shen’s proposed mechanism is correct—but notes more definitive proof is still needed. The Milky Way's Speediest Stars Could Solve a 50-Year-Old Mystery 2018-05-09T04:00:00Z Theorists still need more time to consider Shen’s scenario, he says, but the white dwarf “probably is a part of a supernova explosion.” One of the Milky Way’s fastest stars is an invader from another galaxy 2018-05-08T04:00:00Z Such systems are known as cataclysmic variables because their accretion flows lead to an accumulation of matter on the surface of the white dwarf that then undergoes violent episodes of nuclear burning. Bounteous black holes at the Galactic Centre 2018-04-15T04:00:00Z General relativity predicts that the accelerations of the white dwarf and pulsar, due to being in free fall towards the outer white dwarf, should be identical—despite differences in mass and self-gravity. Triple-Star Test Shows Einstein Was Right, Again 2018-07-05T04:00:00Z Most stars end their lives as white dwarfs or neutron stars. Astronomy 2016-10-13T00:00:00Z If astronomers were to spot such stellar ashes on these white dwarfs, that would lend further support to Shen’s hypothesis. The Milky Way's Speediest Stars Could Solve a 50-Year-Old Mystery 2018-05-09T04:00:00Z So, too, do astrophysical exotica such as neutron stars and white dwarfs—the remnants left by normal stars when they die. Astronomers Spy Swarms of Black Holes at Our Galaxy's Core 2018-04-04T04:00:00Z Transit or occultation of compact stellar objects - white dwarfs and neutron stars: The Techno-Signature Challenge 2018-03-11T05:00:00Z They measured a parameter called Delta, which describes the fractional difference between the acceleration of the white dwarf and the more massive pulsar. Triple-Star Test Shows Einstein Was Right, Again 2018-07-05T04:00:00Z Which is likely to be more common in our Galaxy: white dwarfs or black holes? Astronomy 2016-10-13T00:00:00Z A lightweight star shrinks into a white dwarf, an Earth-size sphere of carbon. Gravitational waves help reveal the weight limit for neutron stars, the densest objects in the cosmos 2018-02-15T05:00:00Z A blog post from Sloan Digital Sky Surveys, a group that conducts astronomical scans and research, notes that exploding white dwarfs also provide elements, as do merging and dying stars and cosmic ray fissions. See How a Massive Supernova Released the Building Blocks of Life 2018-01-10T05:00:00Z Accretion-induced variability links young stellar objects, white dwarfs, and black holes. Magnetically gated accretion in an accreting ‘non-magnetic’ white dwarf 2017-12-12T05:00:00Z Normal type Ia supernovae from violent mergers of white dwarf binaries. Solar abundance ratios of the iron-peak elements in the Perseus cluster 2017-11-12T05:00:00Z This type of supernova occurs when a white dwarf accretes enough material from a companion star to exceed the Chandrasekhar limit and then collapses and explodes. Astronomy 2016-10-13T00:00:00Z The first type of supernova happens when a white dwarf star made from carbon and oxygen attracts material from another star that it orbits. 'Zombie star' amazes astronomers by surviving multiple supernovae 2017-11-08T05:00:00Z But if a star is more than 1.4 times the mass of our Sun, it won’t form a white dwarf but instead explode in a supernova or collapse into a black hole. Today’s Google Doodle celebrates the scientist who revealed how stars die 2017-10-19T04:00:00Z We infer a surface magnetic field strength for the white dwarf in MV Lyrae of between 2 × 104 gauss and 1 × 105 gauss, too low to be detectable by other current methods. Magnetically gated accretion in an accreting ‘non-magnetic’ white dwarf 2017-12-12T05:00:00Z They conclude that a mixture of near- and sub-Chandrasekhar-mass white dwarfs contributed those elements through type Ia supernova explosions. Solar abundance ratios of the iron-peak elements in the Perseus cluster 2017-11-12T05:00:00Z For now, we just note that white dwarfs are dying stars, reaching the end of their productive lives and ready for their stories to be over. Astronomy 2016-10-13T00:00:00Z The white dwarf grows steadily until the density of its core becomes so high that the carbon and oxygen fuse in a runaway reaction that drives the explosion. 'Zombie star' amazes astronomers by surviving multiple supernovae 2017-11-08T05:00:00Z Any star lighter than that will eventually collapse and become a denser body known as white dwarf. S. Chandrasekhar's Life Celebrated With Google Doodle 2017-10-18T04:00:00Z The sun and most sun-like stars will one day become white dwarfs. Famous 600-Year-Old Nova Pinpointed in Modern Day 2017-08-31T04:00:00Z From the Harvard plates, Shara calculated that the white dwarf was moving perpendicularly to Earth. Astronomers discover an ancient exploding star after a 30-year search 2017-08-30T04:00:00Z Show where cool supergiants, white dwarfs, the Sun, and main- sequence stars are found. Astronomy 2016-10-13T00:00:00Z “You get a giant fusion bomb, a hydrogen bomb going off on top of this white dwarf star,” Dr. Shara said. Casting Light on Mystery of a Star That Vanished After 14 Days 2017-08-30T04:00:00Z The red dwarf and white dwarf he spotted seemed to fit the bill. Korean astronomers saw a distant explosion 600 years ago — and we just found the stars that caused it 2017-08-30T04:00:00Z The nova occurs after a white dwarf siphons too much fuel from its companion star, which eventually leads to a nuclear detonation. Famous 600-Year-Old Nova Pinpointed in Modern Day 2017-08-31T04:00:00Z He found the remnants of the eruption — the white dwarf and its erupted shell — within 90 minutes. Astronomers discover an ancient exploding star after a 30-year search 2017-08-30T04:00:00Z It too is a binary system, composed of a faint white dwarf orbiting a bluish-white, main-sequence star. Astronomy 2016-10-13T00:00:00Z The powerful gravity of the white dwarf pulls hydrogen away from its companion star and onto its surface. Casting Light on Mystery of a Star That Vanished After 14 Days 2017-08-30T04:00:00Z Most stars will become white dwarfs one day. Strange Dead Star Could Be Remnant of Mini-Supernova 2017-08-23T04:00:00Z But if the companion star is small — perhaps a second white dwarf — the two celestial bodies would spiral towards each other and merge together before exploding. Supernova’s messy birth casts doubt on reliability of astronomical yardstick 2017-08-16T04:00:00Z As he wound back the clock 580 years, the migrating white dwarf ended up smack in the middle of the discarded shell. Astronomers discover an ancient exploding star after a 30-year search 2017-08-30T04:00:00Z What will happen to stars like our Sun between the main sequence and the white dwarf stages. Astronomy 2016-10-13T00:00:00Z Hence, they provide excellent prospects for life in the distant future, long after the sun will die and turn into a cool white dwarf. The Case for Cosmic Modesty 2017-06-28T04:00:00Z Now, Vennes and his colleagues suggest that the origin of this bizarre white dwarf might lie in what is essentially a miniature version of a supernova. Strange Dead Star Could Be Remnant of Mini-Supernova 2017-08-23T04:00:00Z That suggests that a companion star — another white dwarf, a star like the Sun or even a giant star — helps to set each supernova in motion. Supernova’s messy birth casts doubt on reliability of astronomical yardstick 2017-08-16T04:00:00Z During a nova, a white dwarf star sucks in hydrogen from a neighboring star, sheathing itself in a layer of stolen gas. Astronomers discover an ancient exploding star after a 30-year search 2017-08-30T04:00:00Z In the process, what remains of the star becomes one of the strange white dwarfs that we met in The Stars: A Celestial Census. Astronomy 2016-10-13T00:00:00Z There are exceptions—old stars such as red giants and white dwarfs—but these are easily recognised. Planets come in different species 2017-06-22T04:00:00Z Indeed, "our own sun will finish its own life as an unremarkable white dwarf," Vennes told Space.com. Strange Dead Star Could Be Remnant of Mini-Supernova 2017-08-23T04:00:00Z If this companion star is large, the idea goes, then the white dwarf would siphon material from it. Supernova’s messy birth casts doubt on reliability of astronomical yardstick 2017-08-16T04:00:00Z The white dwarf, which so dramatically shed its hydrogen skin in 1437, will do so again. Astronomers discover an ancient exploding star after a 30-year search 2017-08-30T04:00:00Z What is the acceleration of gravity at the surface of the white dwarf? Astronomy 2016-10-13T00:00:00Z The stars finally aligned in March 2014, when Stein 2051B, a white dwarf about 18 light-years from Earth, passed in front of a more distant background star. Astronomers just achieved something Einstein said was impossible 2017-06-13T04:00:00Z Previous research suggested that Type Iax outbursts might happen when a white dwarf accumulates fuel from a donor star but the core of the white dwarf fails to completely burn during the supernova. Strange Dead Star Could Be Remnant of Mini-Supernova 2017-08-23T04:00:00Z But a supernova formed by the merger of a white dwarf and a small companion would obliterate all traces of the stars involved in its birth. Supernova’s messy birth casts doubt on reliability of astronomical yardstick 2017-08-16T04:00:00Z The new result shows that Stein 2051 B is in fact a very normal white dwarf, and it fits in just fine with the accepted formation theory Sahu said. For First Time, Einstein's Relativity Used to Weigh a Star 2017-06-09T04:00:00Z It is now a white dwarf and will continue to cool slowly for billions of years until all of its remaining store of energy is radiated away. Astronomy 2016-10-13T00:00:00Z An illustration of how the white dwarf warped the light of the background star. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z Unlike many white dwarfs, LP 40-365's atmosphere lacks any trace of hydrogen and helium, the two most common elements in the universe. Strange Dead Star Could Be Remnant of Mini-Supernova 2017-08-23T04:00:00Z Astronomers remain convinced that a white dwarf, an Earth-sized remnant of a Sun-like star, plays a central part in the formation of each type Ia supernova. Supernova’s messy birth casts doubt on reliability of astronomical yardstick 2017-08-16T04:00:00Z This cosmic object is a white dwarf, the small, dense corpse of a star that was once similar to the sun. Einstein's 'Impossible' Experiment Finally Performed 2017-06-07T04:00:00Z Since a stable white dwarf can no longer contract or produce energy through fusion, its only energy source is the heat represented by the motions of the atomic nuclei in its interior. Astronomy 2016-10-13T00:00:00Z With Hubble, the astronomers observed this white dwarf multiple times before and after the crossing, capturing the relative movement of the background star. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z The first of the two main flavors, Type Ia supernovas, occur after a white dwarf is completely destroyed after siphoning too much fuel from a companion star. Strange Dead Star Could Be Remnant of Mini-Supernova 2017-08-23T04:00:00Z Griffin and his team’s paper is the first to report a supernova formed by a white dwarf leaching material from a massive companion star. Supernova’s messy birth casts doubt on reliability of astronomical yardstick 2017-08-16T04:00:00Z “His theory predicts that the radius of the white dwarf decreases as the mass increases in a specific way, and our mass measurement precisely confirmed that!” Einstein's 'Impossible' Experiment Finally Performed 2017-06-07T04:00:00Z Gradually, however, the white dwarf radiates away all its heat into space. Astronomy 2016-10-13T00:00:00Z How the gravity from the white dwarf deflected the light from the background star. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z “It’s a nice addition to our understanding of white dwarf composition,” Barstow says. Astronomers measure the mass of a star—thanks to an old tip from Einstein 2017-06-07T04:00:00Z The project should also boost the number of known recurrent novae — white dwarfs that repeatedly shed matter in explosive bursts, and of which only ten are known in the Milky Way. Citizen scientists to rescue 150 years of cosmic images 2017-03-23T04:00:00Z In other words, this little white dwarf is the most normal, boring dead star imaginable, and scientists are thrilled. Einstein's 'Impossible' Experiment Finally Performed 2017-06-07T04:00:00Z A white dwarf star might make the most impressive engagement present you could ever see, although any attempt to mine the diamond-like material inside would crush an ardent lover instantly! Astronomy 2016-10-13T00:00:00Z In 2014, a group of astronomers using NASA’s Hubble Space Telescope spotted a rare type of microlensing, when a dense white dwarf star passed in front of another star thousands of light-years away. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z The researchers inferred that a white dwarf — a dense remnant of a Sun-like star — is orbiting the black hole at a distance of about 2.5 times that between Earth and the Moon. Astronomy: Star orbits close to black hole : Nature : Nature Research 2017-03-21T04:00:00Z These exploding white dwarf stars are visible across space and flare to a consistent, maximum brightness. A recharged debate over the speed of the expansion of the universe could lead to new physics 2017-03-08T05:00:00Z But researchers now report the discovery of a pulsar that is a white dwarf — the spent remnant of a star like the Sun. Astrophysics: Odd dwarf star is a pulsar : Nature : Nature Research 2017-01-24T05:00:00Z The basic idea is to search for young clusters that contain one or more white dwarf stars. Astronomy 2016-10-13T00:00:00Z The stars weren’t exactly aligned, but they were close enough that the white dwarf made it seem like the background star performed a small loop in the sky. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z Instead, they say, the explosion heats up the companion star for several centuries, causing an increased rate of hydrogen transfer to the white dwarf. Astronomers witness slow buildup and smoldering aftermath to explosive stellar climax 2016-08-17T04:00:00Z This means that during the lengthy wait between explosions, the system goes almost completely dark and the white dwarf stops stealing gas altogether. Star snapped before and after nova explosion - BBC News 2016-08-17T04:00:00Z However, astronomers think SN 1006 was a version of a type Ia triggered by two white dwarfs. ‘Lost’ Sighting of Brightest Supernova Found in Ancient Text While no energy is being generated within the white dwarf core of the star, fusion still occurs in the shells that surround the core. Astronomy 2016-10-13T00:00:00Z One of those was a white dwarf named Stein 2051 B, which was expected to pass in front of another star in March 2014. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z The discovery of a long-sought oxygen white dwarf is an important test case for stellar evolution. A white dwarf with an oxygen atmosphere | Science 2016-03-31T04:00:00Z This is in contrast to a type Ia supernova, which starts with a similar situation but destroys the white dwarf completely in a much bigger explosion. Star snapped before and after nova explosion - BBC News 2016-08-17T04:00:00Z A collision between two white dwarfs—the remnants of a small star—likely caused the most recent supernova in our galaxy, according to new research. See What Triggered the Milky Way's Most Recent Supernova 2016-03-31T04:00:00Z As the shells finish their fusion reactions and stop producing energy, the ashes of the last reaction fall onto the white dwarf core, increasing its mass. Astronomy 2016-10-13T00:00:00Z The astronomers also used the apparent movement of the background star to measure the mass of the passing white dwarf, a novel technique detailed in a paper published today in Science. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z The discovery of a long-sought oxygen white dwarf is an important test case for stellar evolution. A white dwarf with an oxygen atmosphere | Science 2016-03-31T04:00:00Z That extra matter builds up on the surface of the white dwarf until it kicks off a runaway, explosive thermonuclear reaction. Star snapped before and after nova explosion - BBC News 2016-08-17T04:00:00Z In some cases, it may be able to support itself as a white dwarf star. Stephen Hawking’s Reith lecture: Annotated transcript - BBC News 2016-01-26T05:00:00Z Describe the evolution of a star with a mass like that of the Sun, from the main-sequence phase of its evolution until it becomes a white dwarf. Astronomy 2016-10-13T00:00:00Z And sure enough, the more distant star shifted its position ever so slightly as the white dwarf passed by. Astronomers saw one star warp another’s light in a way that Einstein thought we’d never see 2017-06-07T04:00:00Z The team's findings argue against the burst being caused by events involving mature stellar objects, such as colliding white dwarfs or older neutron stars. Mysterious radiowave blast may have come from starquake 2015-12-01T05:00:00Z Such environments tend to harbor several varieties of young, highly active pulsars rather than old neutron stars and white dwarfs, leaving the former as the most probable progenitor for this particular FRB. Fast Radio Bursts Mystify Experts — for Now 2015-12-02T05:00:00Z What would be the fate of those countless stars, with greater mass than a white dwarf or neutron star, when they had exhausted nuclear fuel? Stephen Hawking’s Reith lecture: Annotated transcript - BBC News 2016-01-26T05:00:00Z Apart from the masses, how are binary systems with a neutron star different from binary systems with a white dwarf? Astronomy 2016-10-13T00:00:00Z Something like the sun would collapse into a “white dwarf” about the size of the Earth. The most beautiful theory 2015-11-25T05:00:00Z "Finally, white dwarfs get a little bit of fuss around them," Faedi said. Dying Star Destroys a Dwarf Planet 2015-10-22T04:00:00Z More than 570 light years away in the constellation Virgo, a disintegrating planet orbits around a white dwarf — the leftovers of a yellow star after it died. Zombie white dwarf star caught destroying an orbiting planet 2015-10-21T04:00:00Z “We weren’t really looking for white dwarfs in the Kepler observations,” says Vanderburg. Zombie Star Caught Feasting On Asteroids 2015-10-21T04:00:00Z The first cluster contains mainly main-sequence stars, along with some red giant stars and a few white dwarfs. Astronomy 2016-10-13T00:00:00Z A white dwarf forms when a relatively low-mass star, such as the Sun, runs out of fuel. Dead star spotted eating planetary leftovers 2015-10-20T04:00:00Z Watching the dust from the decomposing object change the light from the white dwarf is a major milestone for understanding stars and the planets that orbit them, the researchers said. Dying Star Destroys a Dwarf Planet 2015-10-22T04:00:00Z But Loeb and Vanderburg hope the discovery of this decaying world will inspire others to study white dwarfs even further. Zombie white dwarf star caught destroying an orbiting planet 2015-10-21T04:00:00Z Observations revealed that the object or objects—there may be several—are whipping around the white dwarf at a blistering pace of once every 4.5 to 4.9 hours. Zombie Star Caught Feasting On Asteroids 2015-10-21T04:00:00Z The second cluster also contains mainly main-sequence stars, along with some red giant stars, and a few neutron stars—but no white dwarf stars. Astronomy 2016-10-13T00:00:00Z Yet for decades, analyses of light coming from white dwarfs have shown that the surfaces of some are rich with metals and other elements. Dead star spotted eating planetary leftovers 2015-10-20T04:00:00Z For the first time, researchers were seeing the 10-year-old theory about how white dwarf systems evolve directly confirmed in the night sky. Dying Star Destroys a Dwarf Planet 2015-10-22T04:00:00Z It's possible that any outer planets that were originally orbiting the star may still remain around the white dwarf. Zombie white dwarf star caught destroying an orbiting planet 2015-10-21T04:00:00Z Another peculiarity is that many white dwarfs appear to be surrounded by swirling disks of dust, which presumably supply the heavy elements that fall into the stars’ atmospheres. Zombie Star Caught Feasting On Asteroids 2015-10-21T04:00:00Z What observations or types of telescopes would you use to distinguish a binary system that includes a main-sequence star and a white dwarf star from one containing a main-sequence star and a neutron star? Astronomy 2016-10-13T00:00:00Z Later sightings of disks of debris around a small fraction of white dwarfs backed up that theory. Dead star spotted eating planetary leftovers 2015-10-20T04:00:00Z By watching a planetary body break apart around the white dwarf, researchers will be able to get a sense of the different elements inside it as it disintegrates. Dying Star Destroys a Dwarf Planet 2015-10-22T04:00:00Z If such a planet were to exist in the habitable zone around a white dwarf, Loeb says it'd be very easy to study and characterize. Zombie white dwarf star caught destroying an orbiting planet 2015-10-21T04:00:00Z And it explains how those heavy elements, which are plentiful in rocky planetesimals, get into the atmosphere of a white dwarf. Zombie Star Caught Feasting On Asteroids 2015-10-21T04:00:00Z Say that a particular white dwarf has the mass of the Sun but the radius of Earth. Astronomy 2016-10-13T00:00:00Z Further analysis of light from the star shows evidence that elements on the white dwarf’s surface include calcium, iron and aluminium, suggesting that the rocky bodies are disintegrating. Dead star spotted eating planetary leftovers 2015-10-20T04:00:00Z "They've actually caught in the act the process of some asteroid breaking into pieces, being disrupted by the white dwarf host star." Dying sun caught tearing apart its own asteroids 2015-10-21T04:00:00Z "Hopefully this will to motivate people to search for planets around white dwarfs." Zombie white dwarf star caught destroying an orbiting planet 2015-10-21T04:00:00Z As a dim white dwarf, it will be hard to find. Sun Accused of Stealing Planetary Objects from Another Star 2015-08-31T04:00:00Z A white dwarf, with its stronger surface gravity, produces more distortion just above its surface than does a red giant with the same mass. Astronomy 2016-10-13T00:00:00Z The smaller of the two is already a white dwarf, and its orbit around its partner is pulling gas ejected from the larger star into the two lobes pictured. Week's Best Space Pictures: Bipolar Stars and a Radio Phoenix 2015-08-28T04:00:00Z "One of the white dwarfs suddenly popped up with this really intriguing signature," Vanderburg says. Dying sun caught tearing apart its own asteroids 2015-10-21T04:00:00Z The end result is a white dwarf — a compact leftover of the original star's inner core. Zombie white dwarf star caught destroying an orbiting planet 2015-10-21T04:00:00Z When this happens, the white dwarf will be blown apart in a matter of seconds in a flash brighter than many billions of suns. Astronomers spot star on the brink of supernova 2015-07-08T04:00:00Z Within each galaxy, stars will continue to go through their lives, eventually becoming white dwarfs, neutron stars, and black holes. Astronomy 2016-10-13T00:00:00Z The smaller of the two is already a white dwarf, and its orbit around its partner is pulling gas ejected from the larger star into the two lobes pictured. Week's Best Space Pictures: Bipolar Stars and a Radio Phoenix 2015-08-28T04:00:00Z USC's Nick Warner likens fuzzballs to white dwarfs and neutron stars, and sees them as the final phase of a star's lifetime. Physics Week in Review: June 27, 2015 2015-06-27T04:00:00Z Artist’s impression of a rocky and water-rich asteroid being torn apart by the strong gravity of the white dwarf star. Water Oceans Likely To Be Ubiquitous, Say Astronomers 2015-05-07T04:00:00Z The leading theory thanks to these new observations is that it's likely the former, more specifically "accreting" white dwarfs — or as they're popularly referred to in astronomy, "vampire systems." The center of our galaxy might be full of dying vampire stars 2015-04-30T04:00:00Z The three points lying below the sequence of points are all white dwarf stars. Astronomy 2016-10-13T00:00:00Z The smaller of the two is already a white dwarf, and its orbit around its partner is pulling gas ejected from the larger star into the two lobes pictured. Week's Best Space Pictures: Bipolar Stars and a Radio Phoenix 2015-08-28T04:00:00Z Then, in 2003 scientists discovered a pulsar system of two objects, one is the density of our sun, but about 12 miles across and the other is a larger white dwarf. The Next Einstein May Be A 27-Year-Old Iranian Woman 2015-03-10T04:00:00Z In the paper, the authors note that “these hydrogen- and oxygen-enriched stars are the metaphorical ‘tip of an iceberg’ of water-accreting white dwarfs.” Water Oceans Likely To Be Ubiquitous, Say Astronomers 2015-05-07T04:00:00Z Eventually, the helium ignited, causing the white dwarf to explode. Fastest Star in the Galaxy Got an Unusual Start 2015-03-05T05:00:00Z Some stars fall in the lower left of the diagram; they are both hot and dim, and must be white dwarfs. Astronomy 2016-10-13T00:00:00Z This cannibalizing neighbor star was most likely a white dwarf: a collapsed star that is no longer burning fuel. Speediest Star's Origins Revealed 2015-03-05T05:00:00Z "Until now, the formation of supernovae Type Ia by the merging of two white dwarfs was purely theoretical," said Dr David Jones, a research fellow at ESO and another of the report's authors. Doomed stars found at nebula's heart 2015-02-09T05:00:00Z K2″ phase of the mission that it didn’t have time for before—looking for everything from pulsations in white dwarf stars to giant black holes and supernovas in distant galaxies. How Do You Fix a Telescope Millions of Miles From Earth? Quite Well if You're NASA 2014-12-22T05:00:00Z Once the orbit of these two stars began to tighten, helium from the red giant was transferred to the white dwarf, according to a study published in Science. Fastest Star in the Galaxy Got an Unusual Start 2015-03-05T05:00:00Z We have now found thousands of white dwarfs. Astronomy 2016-10-13T00:00:00Z This year’s Breakthrough Prize in Fundamental Physics was given to two teams of astrophysicists who raced to find exploding white dwarfs in distant galaxies. Astronomers win big in science mega-awards 2014-11-09T05:00:00Z "What it does tell us is that these massive white dwarf binaries actually exist - even though they were theoretically predicted, that actually hadn't been confirmed." Doomed stars found at nebula's heart 2015-02-09T05:00:00Z Stellar mass black holes are often found in binary systems where the other star is a white dwarf. The Week in Geek: Black hole edition 2014-11-02T04:00:00Z Originally, US 708 was a red giant star, and its partner was a white dwarf. Fastest Star in the Galaxy Got an Unusual Start 2015-03-05T05:00:00Z What about the other stars on the H–R diagram—the giants and supergiants, and the white dwarfs? Astronomy 2016-10-13T00:00:00Z Perhaps most surprisingly, the astronomers found that despite the ferocity of the detonation on the white dwarf’s surface, the star itself emerges almost unscathed – leaving it free to start the whole process all over again. Exploding Stellar Fireball Caught On Camera For The First Time 2014-10-27T04:00:00Z The presence of two stars also explains the odd shape of the surrounding nebula, called Henize 2-428 - a cloud of gas thrown into space when the stars first died and became white dwarfs. Doomed stars found at nebula's heart 2015-02-09T05:00:00Z So even though we can’t see the black hole, the orbit of the white dwarf betrays its presence. The Week in Geek: Black hole edition 2014-11-02T04:00:00Z This makes any planets hosted by white dwarfs easier to see, and thus they are tempting targets for future observatories such as NASA’s James Webb Space Telescope, which is scheduled to launch in 2018. Sun’s stroke keeps Kepler online 2014-10-20T04:00:00Z The white dwarfs, at the lower-left corner of the H–R diagram, have densities many times greater still. Astronomy 2016-10-13T00:00:00Z Novae happen when an exotic, compact star called a white dwarf strips the matter from a nearby companion star with its intense gravitational field. Exploding Stellar Fireball Caught On Camera For The First Time 2014-10-27T04:00:00Z In fact, these nebulae are the bright, energised gas clouds created when a red giant star dies and evolves into a white dwarf. Doomed stars found at nebula's heart 2015-02-09T05:00:00Z Theorists propose that the carbon and oxygen found in a white dwarf should be fused into radioactive nickel during a supernova. Dead stars 'can re-ignite' and blow 2014-08-28T04:00:00Z Other potential targets abound, including brown dwarfs — the smallest stars, which have clouds and storms like Jupiter — and white dwarfs, which are dim compared with Sun-like stars. Sun’s stroke keeps Kepler online 2014-10-20T04:00:00Z How much would you weigh if you were suddenly transported to the white dwarf Sirius B? Astronomy 2016-10-13T00:00:00Z But white dwarf binary systems are usually found in the light of a galaxy, not tens of thousands of parsecs away. Lonely Supernovae May Have Been Kicked Out Of Their Galaxies 2014-08-08T04:00:00Z Each of the white dwarfs is nearly as heavy as our own sun and they orbit each other in 4.2 hours. Doomed stars found at nebula's heart 2015-02-09T05:00:00Z However, the researchers were not able to distinguish between the two theoretical scenarios for the initiation of a white dwarf supernova. Dead stars 'can re-ignite' and blow 2014-08-28T04:00:00Z Or, he says, when two white dwarfs in a compact binary system eventually merge and their combined mass reaches the Chandrasekhar limit. Odds Remain Against Earth Being Hit By Lethal Supernova 2014-06-30T04:00:00Z When light or other radiation emerges from a compact smaller remnant, such as a white dwarf or neutron star, it shows a gravitational redshift due to the slowing of time. Astronomy 2016-10-13T00:00:00Z The other is a white dwarf—a small, dim star a little larger than Earth, but so dense that a spoonful weighs tons. Oddball Eclipse Makes Sun Brighter 2014-05-15T04:00:00Z "There's a big debate going on in the community - whether the merger of two massive white dwarfs produces a type Ia or a core collapse supernova," Dr Podsiadlowski told BBC News. Doomed stars found at nebula's heart 2015-02-09T05:00:00Z Towards the end of its life, a star with the mass of the Sun will shed its outer layers as its core shrinks down to become a white dwarf. Dead stars 'can re-ignite' and blow 2014-08-28T04:00:00Z Some observations of Regulus suggest the object is not just one star, but two—that in fact a hidden white dwarf star orbits Regulus in a close binary system. Clouds Threaten Rare Chance to See Star `Wink' Over New York 2014-03-19T18:24:52Z Look elsewhere in this book for necessary data, and indicate what the final stage of evolution—white dwarf, neutron star, or black hole—will be for each of these kinds of stars. Astronomy 2016-10-13T00:00:00Z Other stars will be reduced to dense, dead remnants—black holes, neutron stars and aging white dwarfs, slowly dimming to black. This is the way the world ends: How the cosmos will meet its demise 2014-03-09T13:00:00Z Astrophysicists should look for unusual signals in old stars, such as neutron stars and white dwarfs. Physics: Broaden the search for dark matter 2014-03-05T18:50:41.303Z Left to their own devices, single white dwarfs will just cool off slowly over time. Dead stars 'can re-ignite' and blow 2014-08-28T04:00:00Z It belongs to the type Ia class of supernovae, formed when one star loses enough mass to a companion white-dwarf star to cause the white dwarf to explode. Seven days: 30 January–5 February 2014 2014-01-29T18:50:32.595Z Seen in this picture are hundreds of hot white dwarfs, neutron stars, and stellar black holes with accretion disks glowing with X-rays. Astronomy 2016-10-13T00:00:00Z In case you’re wondering why astronomers have been antsy today, it’s because they found an exploding white dwarf. Physics Week in Review: January 25, 2014 2014-01-25T05:52:03Z Regardless, astronomers agree that type 1a explosions are found most often among old white dwarfs. Supernova Erupts in Nearby Galaxy 2014-01-23T05:00:00Z Moreover, the observed amount of gamma-ray emission was also an excellent match for theoretical models of a white dwarf explosion. Dead stars 'can re-ignite' and blow 2014-08-28T04:00:00Z The finding erodes a long-standing view that type Ia supernovae arise from a single white dwarf accruing material from an ordinary companion star, either a Sun-like star or an elderly, bloated red giant. Kepler clue to supernova puzzle 2014-01-15T18:20:59.210Z Where would you expect to find Type I supernovae, which involve the explosions of white dwarfs? Astronomy 2016-10-13T00:00:00Z They found a pulsar with two white dwarfs all packed in a space smaller than Earth's orbit of the Sun. Triple star system clue to gravity 2014-01-05T19:18:49Z Researchers have ruled out many possible parameters for dark photons with help of white dwarf stars. Physics Week in Review: November 9, 2013 2013-11-09T20:45:03.370Z This class of supernova occurs when a particular type of star called a white dwarf reaches its maximum mass limit, which is the same for all white dwarfs, and explodes with a standard brightness. Leading Dark Energy Theory Incompatible with New Measurement 2013-10-22T11:45:03.273Z Both require that a white dwarf takes on material from a companion object until the pressure ignites a runaway thermonuclear explosion. Kepler clue to supernova puzzle 2014-01-15T18:20:59.210Z Suppose these particles were assembled into black holes, brown dwarfs, or white dwarfs. Astronomy 2016-10-13T00:00:00Z It is a white dwarf—the dense hulk left over after a star has used up its fuel for nuclear fusion and cast off its outer gaseous layers into space. Pulverized Asteroid around Distant Star Was Full of Water 2013-10-10T19:45:02.563Z The new images show the ring wrapped around a football-shaped cloud of glowing helium, fueled by radiation from a white dwarf star in the middle. The Week: 3-D Help for Breathing, Vanishing Amphibians and More 2013-05-27T20:13:47Z If an asteroid fell toward a white dwarf, by contrast, tidal forces generated by the dwarf’s high surface gravity would tear it apart by the time it got within a million miles or so. Cosmic Graveyard: Looking For Life in an Unlikely Place 2013-05-21T10:50:24Z For years, the idea that type Ia supernovae might arise from merging white dwarfs was discounted because the final stages of the merger were thought to occur slowly, over the course of thousands of years. Kepler clue to supernova puzzle 2014-01-15T18:20:59.210Z Suppose the dark matter in the halo of the Milky Way were made up of black holes, brown dwarfs, and white dwarfs. Astronomy 2016-10-13T00:00:00Z Some of the asteroid’s remains are now scattered over the surface of the star, where they show up as chemical signatures in the light of the white dwarf. Pulverized Asteroid around Distant Star Was Full of Water 2013-10-10T19:45:02.563Z The rocky material is akin to the building blocks of planets—and its presence suggests that the two stars formed planetary systems before they expired and became white dwarfs. Exoplanet Building Blocks Found Around White Dwarfs 2013-05-14T22:15:00.280Z But the silicon atoms would sink to the core of the white dwarf relatively quickly, vanishing from spectral sight. Cosmic Graveyard: Looking For Life in an Unlikely Place 2013-05-21T10:50:24Z They are so-called white dwarfs - the exhausted cores of average-size stars not unlike our Sun. 'Dirty' stars hint at Sun's future 2013-05-09T22:25:05Z The stars are white dwarfs, dying stars with such intense gravity that they drag elements heavier than hydrogen and helium beneath their surfaces. ScienceShot: Rocky Planets in the Nearest Star Cluster? 2013-05-09T20:45:00Z They found magnesium, iron, silicon and other heavy elements, which wouldn’t exist naturally on the surface of a white dwarf, suggesting that they fell onto the star from an orbiting object. Pulverized Asteroid around Distant Star Was Full of Water 2013-10-10T19:45:02.563Z Ia supernovae occur in binary systems where a white dwarf star orbits a companion star. The Countdown, Episode 19 - Voyager Hokey Pokey, Mini-Supernovae, Mercury Meteorite?, Planck's Map, Birth of Massive Stars 2013-04-06T00:15:03.040Z The first of the two main flavors, Type Ia supernovas, happen after a white dwarf star dies from siphoning off too much mass from a companion star. First Mini-Supernovas Discovered 2013-03-27T16:15:00.877Z Ben Murdin of the University of Surrey, for example, has been making white dwarfs. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z “The white dwarf,” says Loeb, “would be about the same color as the Sun, and while it would be a hundred times smaller, you’d also be a hundred times closer.” Could Tiny Stars Hold Mirror Earths? 2013-03-06T08:05:00Z Some experts aren’t convinced that the oxygen found on the surface of the white dwarf is a clear sign that water existed on an orbiting asteroid, however. Pulverized Asteroid around Distant Star Was Full of Water 2013-10-10T19:45:02.563Z The strong gravity of the dense white dwarf actually steals material away from its companion, until the dwarf gets too big and explodes. The Countdown, Episode 19 - Voyager Hokey Pokey, Mini-Supernovae, Mercury Meteorite?, Planck's Map, Birth of Massive Stars 2013-04-06T00:15:03.040Z In any case, it appears that in many Type Iax supernovas, the white dwarf actually survives the explosion, unlike in Type Ia supernovas, in which the white dwarfs are completely destroyed. First Mini-Supernovas Discovered 2013-03-27T16:15:00.877Z A white dwarf is the stellar equivalent of a shrunken but feisty old-age pensioner. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z If life did manage to gain a foothold a white dwarf world, it might do best in the endless twilight on the border between its two sides. Could Tiny Stars Hold Mirror Earths? 2013-03-06T08:05:00Z Scientists don’t know for sure if GD 61 had, or has, planets, but they say a giant planet most likely pushed the asteroid in toward its doom near the white dwarf. Pulverized Asteroid around Distant Star Was Full of Water 2013-10-10T19:45:02.563Z The different process leads to a different type of explosion, one the white dwarf might manage to survive. The Countdown, Episode 19 - Voyager Hokey Pokey, Mini-Supernovae, Mercury Meteorite?, Planck's Map, Birth of Massive Stars 2013-04-06T00:15:03.040Z At the 221st meeting of the American Astronomical Society here, researchers reported the discovery of a planetary system around a white dwarf in the famous Hyades star cluster. ScienceShot: Planets Orbit Dead Stars 2013-01-08T22:20:00Z As they shrink white dwarfs pack a mass up to eight times the sun’s into a volume the size of Earth. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z These new models of failed supernovae demonstrate how both normal brightness and extremely dim supernovae are generated from the same basic picture of a nuclear-burning white dwarf star, he added. When A Supernova ... Fizzles 2012-11-20T16:05:37Z The sun, like 98 percent of the stars in the galaxy, will also become a white dwarf eventually, and its ferocious gravity will probably strip Earth and other inner planets of their heavy elements. Pulverized Asteroid around Distant Star Was Full of Water 2013-10-10T19:45:02.563Z A pair-instability supernova emits about 10 times as much light as the brightest normal supernovae, which occur when white dwarf stars explode. Farthest Supernova Yet Marked Death of Very Massive Star 2012-10-31T20:20:03Z CALIFORNIA—Planets appear to be everywhere astronomers look, even in orbit around white dwarf stars—the compacted and slowly cooling "corpses" of stars like our own sun. ScienceShot: Planets Orbit Dead Stars 2013-01-08T22:20:00Z A consequence of stuffing so much matter into so little space is that white dwarfs have powerful magnetic fields. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z For example, the scientists say that white dwarfs or neutron stars wouldn't emit so many radio waves. Two Black Holes Inhabit Same Star Cluster 2012-10-03T18:04:04Z The culprit in these cases is clear: type Ia supernovae arise from the cataclysmic explosions of small, dense stars known as white dwarfs. No Star Left Behind: Fruitless Search for Supernova Survivor Hints at Unexpected Origins 2012-09-27T10:15:00.180Z The other way is slow, with the white dwarf dragging material from a companion that is more like the Sun as it is now, or a giant star, over time. Supernova 1006 lived fast and left no companion behind 2012-09-26T19:45:00.210Z This may be the ultimate fate of our own solar system, after the sun sheds its gaseous mantle into space and condenses into a white dwarf. ScienceShot: Planets Orbit Dead Stars 2013-01-08T22:20:00Z Many aspects of a white dwarf’s mechanics, including how long it will last, are thought to depend on its magnetism. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z And that already rapid orbital dance is speeding up as the two white dwarfs spiral in on each other. White Dwarf Binary Stars Make Merger Plans 2012-09-17T19:15:21.343Z A somewhat more complex dynamic plays out in the case of what’s known as a Type 1A supernova, which is the eruption of a small, dead carcass of a star known as a white dwarf. The Great, Exploding Monty Python Star 2012-08-24T16:35:33Z One way is fast, stealing material from another white dwarf in orbit around the soon-to-explode one, and breaking it up in the process. Supernova 1006 lived fast and left no companion behind 2012-09-26T19:45:00.210Z As this red giant swelled with age, this matter poured on its white dwarf companion, occasionally triggering explosions known as novas. Red Giants and White Dwarfs Make Explosive Stellar Pairings 2012-08-23T21:15:00.213Z To make estimates, scientists examine the light a white dwarf emits for telltale patterns left by stellar ingredients like hydrogen. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z In a binary system called J0651, two white dwarfs circle each other very rapidly. White Dwarf Binary Stars Make Merger Plans 2012-09-17T19:15:21.343Z More common are are smaller, garden variety white dwarf explosions — novas without the super prefix — sometimes occurring repeatedly as a single white dwarf vacuums up and blasts away red giant material over and over again. The Great, Exploding Monty Python Star 2012-08-24T16:35:33Z Such a supernova is supposed to result when a larger companion star dumps material onto the white dwarf, triggering a runaway nuclear reaction that annihilates the small star. ScienceShot: No Star Left Behind 2012-08-17T17:19:00Z Enough material eventually poured onto this white dwarf to set off a far more powerful supernova. Red Giants and White Dwarfs Make Explosive Stellar Pairings 2012-08-23T21:15:00.213Z The problem is that the theory puts white dwarfs’ magnetic fields at 100,000 tesla or more, well beyond humanity’s reach. Table-top astrophysics: How to build a multiverse 2013-03-14T16:06:58Z In about a million years, the white dwarfs will get so close that the larger one will start to cannibalize its smaller companion. White Dwarf Binary Stars Make Merger Plans 2012-09-17T19:15:21.343Z Throughout the 20th century, the central white dwarf in the Red Spider Nebula eluded detection, and its temperature remained unknown. How Hot Is the Hottest Star? [Excerpt] 2012-07-27T10:15:00.230Z In addition to sampling cupcakes in flavours such as 'red planet' and 'white dwarf', visitors tapped their toes to live music and entered a raffle to win bits of meteorite. NASA Scientists Fight Budget Cuts with 'Bake Sale' 2012-06-11T19:15:00.407Z Eventually, all this extra gas increases the white dwarf's mass enough to trigger runaway nuclear reactions that detonate the white dwarf. Red Giants and White Dwarfs Make Explosive Stellar Pairings 2012-08-23T21:15:00.213Z He and Tsujimoto propose in The Astrophysical Journal Letters that it takes a virtual village of exploding white dwarfs to endow an entire cluster of 100,000 stars with such high iron-to-magnesium ratios. Iron in the Fire: The Little-Star Supernovae That Could 2012-06-05T12:15:00.187Z Halo stars die by becoming red giants and then white dwarfs—dense stars little larger than Earth. The Milky Way's Oldest and Wisest Stars 2012-05-30T18:10:00Z But as the heat radiates away over time, the white dwarfs tend to cool down to less than 18,000 degrees. Earthly Machine Recreates Star's Sizzling-Hot Surface 2012-01-30T20:49:00Z Eventually that star, which now shines fiercely in ultraviolet wavelengths, will evolve to become a white dwarf, a dense star about as massive as our sun yet only slightly larger than Earth. ScienceShot: A Revealing Look at the Helix Nebula 2012-01-19T11:00:00Z The findings reveal that the event is a “Type Ia” supernova, created by the relatively peaceful death of a star like our sun, which then shrank into a dense star called a white dwarf. NASA Reveals the Mysteries of the First Known Supernova 2011-10-31T20:01:53Z Named type Ia, these supernovae occur when a white dwarf—a dense star smaller in diameter than Earth—accretes too much material from a companion star and gains a mass of at least 1.4 suns. Iron in the Fire: The Little-Star Supernovae That Could 2012-06-05T12:15:00.187Z The spectra of the white dwarfs indicate the stars are 53% as massive as the sun. The Milky Way's Oldest and Wisest Stars 2012-05-30T18:10:00Z Specifically, they look at how some of the light is absorbed in the outer surface of the white dwarf. Earthly Machine Recreates Star's Sizzling-Hot Surface 2012-01-30T20:49:00Z The star — similar to our sun — died peacefully and turned into a dense white dwarf. Telescopes solve 2,000-year-old stellar mystery, cavity surrounded 1st recorded exploded star 2011-10-24T19:02:09Z The white dwarf is thought to have later blown up in a supernova after siphoning matter, or fuel, from a nearby star. NASA Reveals the Mysteries of the First Known Supernova 2011-10-31T20:01:53Z The time lag occurs because white dwarfs evolve from stars that live longer than high-mass stars do. Iron in the Fire: The Little-Star Supernovae That Could 2012-06-05T12:15:00.187Z At the conference today, Gänsicke presented observations of white dwarf stars that appear to be polluted with the remains of planets. Earth's Ultimate Destruction—And Possible Reincarnation 2011-09-16T22:00:33Z The surface of a white dwarf is largely a plasma, or electrically charged gas. Earthly Machine Recreates Star's Sizzling-Hot Surface 2012-01-30T20:49:00Z It may be the remains of a carbon-rich white dwarf star. Diamond World Discovered By Astronomers 2011-08-25T18:15:00.233Z The observations also show for the first time that a white dwarf can create a cavity around it before blowing up in a Type Ia event. NASA Reveals the Mysteries of the First Known Supernova 2011-10-31T20:01:53Z "It is unique among known white dwarfs," says Benjamin Zuckerman, an astronomer at the University of California, Los Angeles. 'Earth-Mars' Collision May Have Happened in Alien Solar System 2011-08-12T20:50:00Z The white dwarf star at the center of this planetary nebula may be accompanied by a second-generation world, formed from the debris of the dying star's original planets. Earth's Ultimate Destruction—And Possible Reincarnation 2011-09-16T22:00:33Z Better understanding this behavior would help astronomers improve the accuracy of white dwarf age estimates. Earthly Machine Recreates Star's Sizzling-Hot Surface 2012-01-30T20:49:00Z The extreme brightness of the new class of supernovae, some 10 times that of a typical type Ia supernova from an exploding white dwarf, rank them among the most luminous supernovae known. Shattered Expectations: Ultrabright Supernovae Defy Explanation 2011-06-08T22:15:00.240Z “A white dwarf is like a smoking cinder from a burnt-out fire,” Williams said. NASA Reveals the Mysteries of the First Known Supernova 2011-10-31T20:01:53Z Those cataclysms occur when a small, dense star known as a white dwarf grows too massive, becomes unstable, and explodes in a thermonuclear blast. The Real Explosions in the Sky: Supernovae Translated into Music [Video] 2011-05-26T22:15:02.877Z “If observable, these warps, known as gravitational waves, would let us peer into the very heart of the exploding white dwarf itself, within the first few seconds of the explosion.” Modeling Ripples in Spacetime 2011-04-12T15:29:03Z It would also help scientists studying exotic phenomena like the "freezing" of white dwarf cores as they cool. Earthly Machine Recreates Star's Sizzling-Hot Surface 2012-01-30T20:49:00Z Through a punched-out sliver of ceiling, the scope pointed into a slice of sky at the Sirius white dwarf star, the only bright point in a foggy, city-bright horizon. | A Night to Peer at the Heavens 2011-03-26T05:42:15Z In these systems the white dwarfs may eventually grow massive enough to collapse catastrophically and explode as supernovas. Birth and death within Andromeda 2011-01-04T20:03:19Z Smith will lose his temper and implode inward like a white dwarf star. Week 5 N.F.L. Matchups 2010-10-08T11:30:00Z |
| 随便看 |
英语例句辞典收录了117811条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。