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Planetary Systems Around White Dwarfs
- Physics, GeologyOxford Research Encyclopedia of Planetary Science
- 2021
White dwarf planetary science is a rapidly growing field of research featuring a diverse set of observations and theoretical explorations. Giant planets, minor planets, and debris discs have all been…
Five New Post-main-sequence Debris Disks with Gaseous Emission
- Physics, GeologyThe Astrophysical Journal
- 2020
Observations of debris disks, the products of the collisional evolution of rocky planetesimals, can be used to trace planetary activity across a wide range of stellar types. The most common end…
Characterizing the Chemistry of Planetary Materials Around White Dwarf Stars
- Physics, Geology
- 2017
Planetary systems that orbit white dwarf stars can be studied via spectroscopic observations of the stars themselves. Numerous white dwarfs are seen to have accreted mostly rocky minor planets, the…
Compositions of Planetary Debris around Dusty White Dwarfs
- Physics, GeologyThe Astronomical Journal
- 2019
The photospheres of some white dwarfs (WDs) are “polluted” by accretion of material from their surrounding planetary debris. WDs with dust disks are often heavily polluted and high-resolution…
The dust never settles: collisional production of gas and dust in evolved planetary systems
- Physics, GeologyMonthly Notices of the Royal Astronomical Society
- 2020
Multi-epoch infrared photometry from Spitzer is used to monitor circumstellar discs at white dwarfs, which are consistent with disrupted minor planets whose debris is accreted and chemically…
White Dwarf Planetary Systems: Insights Regarding the Fate of Planetary Systems
- Physics, Geology
- 2017
Planetary material accreted by white dwarfs provides critical insights regarding the composition of planetary material . The analysis of polluted white dwarfs suggests that rocky planetary material…
How Sublimation Delays the Onset of Dusty Debris Disk Formation around White Dwarf Stars
- Physics, GeologyThe Astrophysical Journal Letters
- 2021
Although numerous white dwarf stars host dusty debris disks, the temperature distribution of these stars differs significantly from the white dwarf population as a whole. Dusty debris disks exist…
Throwing Icebergs at White Dwarfs
- Physics, Geology
- 2017
White dwarfs (WDs) have atmospheres that are expected to consist nearly entirely of hydrogen and helium, since heavier elements will sink out of sight on short timescales. However, observations have…
Lithium pollution of a white dwarf records the accretion of an extrasolar planetesimal
- Physics, GeologyScience
- 2020
The detection of lithium, sodium, potassium, and calcium in the atmosphere of the white dwarf Gaia DR2 is reported, which is ascribe to the accretion of a planetesimal, and abundance ratios of these elements are consistent with meteoritic values in the Solar System.
Unstable low-mass planetary systems as drivers of white dwarf pollution
- Physics, Geology
- 2018
At least 25 percent of white dwarfs show atmospheric pollution by metals, sometimes accompanied by detectable circumstellar dust/gas discs or (in the case of WD 1145+017) transiting disintegrating…
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A metal-rich gas disk around a moderately hot and young white dwarf implies that planetary systems may form around high-mass stars.
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Infrared studies have revealed debris likely related to planet formation in orbit around ∼30% of youthful, intermediate mass, main-sequence stars. We present evidence, based on atmospheric pollution…
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THE LINK BETWEEN PLANETARY SYSTEMS, DUSTY WHITE DWARFS, AND METAL-POLLUTED WHITE DWARFS
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