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Another one grinds the dust: variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2

Manser, Christopher J.; Gänsicke, Boris T.; Koester, Detlev; Marsh, Thomas R.; Southworth, John

Another one grinds the dust: variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2 Thumbnail


Authors

Christopher J. Manser

Boris T. Gänsicke

Detlev Koester

Thomas R. Marsh



Abstract

We report 9 yr of optical spectroscopy of the metal-polluted white dwarf SDSS J104341.53+085558.2, which presents morphological variations of the line profiles of the 8600 Å Ca?II triplet emission from the gaseous component of its debris disc. Similar changes in the shape of the Ca?II triplet have also been observed in two other systems that host a gaseous disc, and are likely related to the same mechanism. We report the Mg, Si, and Ca abundances of the debris detected in the photosphere of SDSS J1043+0855, place upper limits on O and Fe, and derive an accretion rate of (2.5–12)?×?108 g s-1, consistent with those found in other systems with detected debris discs. The Mg/Si ratio and the upper limit on the Fe/Si ratio of the accreted material broadly agree with those found for the crust of the Earth. We also review the range of variability observed among white dwarfs with planetary debris discs.

Journal Article Type Article
Acceptance Date Jul 18, 2016
Online Publication Date Jul 20, 2016
Publication Date Oct 21, 2016
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 462
Issue 2
Pages 1461 - 1469
DOI https://doi.org/10.1093/mnras/stw1760
Keywords accretion, accretion discs, circumstellar matter, line, profiles, stars, individual, SDSS J104341.53+085558.2230, white dwarfs
Publisher URL http://dx.doi.org/10.1093/mnras/stw1760

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