Discovery of Beryllium in White Dwarfs Polluted by Planetesimal Accretion

  title={Discovery of Beryllium in White Dwarfs Polluted by Planetesimal Accretion},
  author={Beth L. Klein and Alexandra E. Doyle and Ben Zuckerman and P. Dufour and Simon Blouin and Carl Melis and Alycia J. Weinberger and Edward D. Young},
  journal={The Astrophysical Journal},
The element beryllium is detected for the first time in white dwarf stars. This discovery in the spectra of two helium-atmosphere white dwarfs was made possible only because of the remarkable overabundance of Be relative to all other elements, heavier than He, observed in these stars. The measured Be abundances, relative to chondritic, are by far the largest ever seen in any astronomical object. We anticipate that the Be in these accreted planetary bodies was produced by spallation of one or… 

Unusual Abundances from Planetary System Material Polluting the White Dwarf G238-44

Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal 10 elements heavier than helium: C, N, O,

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Polluted white dwarfs (WDs) offer a unique way to study the bulk compositions of exoplanetary material, but it is not always clear if this material originates from comets, asteroids, moons, or

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We evaluate the potential for gravitational-wave (GW) detection in the frequency band from 10 nHz to 1 µ Hz using extremely high-precision astrometry of a small number of stars. In particular, we

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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

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Spectrophotometrie multicouleur de 319 naines blanches et magnitudes mesurees a six longueurs d'onde. Les resultats permettent d'etudier des particularites de distributions d'energie revelees dans

The Iraf Data Reduction And Analysis System

  • D. Tody
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    Astronomical Telescopes and Instrumentation
  • 1986
The IRAF system provides a good selection of programs for general image processing and graphics applications, plus a large selection ofprograms for the reduction and analysis of optical astronomy data.

Accretion and diffusion in white dwarfs - New diffusion timescales and applications to GD 362 and G 29-38

Context. A number of cool white dwarfs with metal traces, of spectral types DAZ, DBZ, and DZ have been found to exhibit infrared excess radiation due to circumstellar dust. The origin of this dust is

VizieR Online Data Catalog

Icy Exomoons Evidenced by Spallogenic Nuclides in Polluted White Dwarfs

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Lithium pollution of a white dwarf records the accretion of an extrasolar planetesimal

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.

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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

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Optical spectroscopic observations of white dwarf stars selected from catalogs based on the Gaia DR2 database reveal nine new gaseous debris disks that orbit single white dwarf stars, about a factor