Manser, Christopher J., Gänsicke, B. T. (Boris T.), Koester, Detlev, Marsh, T. R. and Southworth, J. (John) (2016) Another one grinds the dust : variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2. Monthly Notices of the Royal Astronomical Society, 462 (2). pp. 1461-1469. doi:10.1093/mnras/stw1760

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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) × 10^8 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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	Accretion (Astrophysics), Circumstellar matter, White dwarf stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	0035-8711
Official Date:	21 October 2016
Dates:	Date Event 21 October 2016 Published 20 July 2016 Available 18 July 2016 Accepted 17 July 2016 Submitted
Date of first compliant deposit:	24 October 2016
Date of first compliant Open Access:	24 October 2016
Volume:	462
Number:	2
Page Range:	pp. 1461-1469
DOI:	10.1093/mnras/stw1760
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Seventh Framework Programme (European Commission) (FP7), Alfred P. Sloan Foundation, European Southern Observatory (ESO), National Science Foundation (U.S.) (NSF), United States. Department of Energy. Office of Science, Royal Greenwich Observatory. Isaac Newton Group of Telescopes (Santa Cruz de la Palma, Canary Islands)
Grant number:	20964 WDTracer (FP7), Programme IDs: 087.D- 0139 and 386.C-0218 (ESO)

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