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Discovery of Beryllium in White Dwarfs Polluted by Planetesimal Accretion
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Discovery of Beryllium in White Dwarfs Polluted by Planetesimal Accretion
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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 more of O, C, and N in a region of high fluence of particles of MeV or greater energy.
Forward citations
Cited by 2 Pith papers
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Magnetically guided accretion and extremely slow rotation in a metal-enriched white dwarf
WD 1532+129 rotates once every ~289 days — the slowest directly measured spin of any white dwarf — and its accreted metals sit in patches at both magnetic poles.
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First planetesimals from DESI DR1: 12 highly metal-rich white dwarfs
Twelve white dwarfs from DESI DR1 have accreted debris resembling inner-Solar-System rock, with two systems likely accreting water-rich planetesimals.
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