Manser, CJ, Gansicke, BT, Koester, D, Marsh, TR and Southworth, J (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). 1461 - 1469. ISSN 1365-2966

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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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: accretion, accretion discs, circumstellar matter, line, profiles, stars, individual, SDSS J104341.53+085558.2230, white dwarfs
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 01 Dec 2016 10:52
Last Modified: 08 Apr 2019 09:13

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