Alkali metals in white dwarf atmospheres as tracers of ancient planetary crusts

Hollands, Mark A.; Tremblay, Pier-Emmanuel; Gänsicke, Boris T.; Koester, Detlev; Gentile-Fusillo, Nicola P.

doi:10.48550/arxiv.2101.01225

Cited by 1 publication

(3 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Li abundances appear modestly enhanced in all the stars. Kaiser et al (2020) interpret the enhanced Li in these old WDs in the context of galactic chemical evolution, while Hollands et al (2021) assert that the observed Li in all four of their sample stars comes from differentiated planetary crusts. Indeed, the elements Li and Be are enhanced in Earth's crust, but we also note that the overall composition of the crust is considerably different from bulk Earth, CI chondrites, and main sequence stars.…”

Section: Comparison To LI Polluted Wdsmentioning

confidence: 98%

“…Two recent papers report the discovery of lithium in a handful of very cool (T eff < 5000 K) WD atmospheres (Kaiser et al 2020;Hollands et al 2021). The Li abundances appear modestly enhanced in all the stars.…”

Section: Comparison To LI Polluted Wdsmentioning

confidence: 99%

“…Recently, with parallax and photometry measurements from Gaia DR2 (Gaia Collaboration et al 2016, 2018, it has been possible to identify previously unknown WDs from photometric colors and absolute magnitudes. Thanks to those data, studies covering the cooler end of the WD sequence have recently resulted in the detections of Li and K, by two independent groups (Kaiser et al 2020;Hollands et al 2021). In this paper, using Gaia DR2 along with the exquisite sensitivity Be II detection in GALEXJ2339 from Keck/HIRES.…”

Section: Introductionmentioning

confidence: 96%

See 2 more Smart Citations

Discovery of Beryllium in White Dwarfs Polluted by Planetesimal Accretion

Klein,

Doyle,

Zuckerman

et al. 2021

Preprint

View full text Add to dashboard Cite

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.

show abstract

Section: Comparison To LI Polluted Wdsmentioning

confidence: 98%

Section: Comparison To LI Polluted Wdsmentioning

confidence: 99%