Manser, Christopher J., Gänsicke, B. T. (Boris T.), Marsh, Tom, Veras, Dimitri, Koester, Detlev, Breedt, Elmé, Pala, Anna F., Parsons, Steven G. and Southworth, John (2016) Doppler imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9. Monthly Notices of the Royal Astronomical Society, 455 (4). pp. 4467-4478. doi:10.1093/mnras/stv2603

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Abstract

Debris discs which orbit white dwarfs are signatures of remnant planetary systems. We present 12 yr of optical spectroscopy of the metal-polluted white dwarf SDSS J1228+1040, which shows a steady variation in the morphology of the 8600 Å Ca II triplet line profiles from the gaseous component of its debris disc. We identify additional emission lines of O I, Mg I, Mg II, Fe II and Ca II in the deep co-added spectra. These emission features (including Ca H & K) exhibit a wide range in strength and morphology with respect to each other and to the Ca II triplet, indicating different intensity distributions of these ionic species within the disc. Using Doppler tomography, we show that the evolution of the Ca II triplet profile can be interpreted as the precession of a fixed emission pattern with a period in the range 24–30 yr. The Ca II line profiles vary on time-scales that are broadly consistent with general relativistic precession of the debris disc.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	White dwarf, Stars
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Oxford University Press
ISSN:	0035-8711
Official Date:	1 February 2016
Dates:	Date Event 1 February 2016 Published 10 December 2015 Available 3 November 2015 Accepted 6 October 2015 Submitted
Date of first compliant deposit:	6 October 2016
Volume:	455
Number:	4
Page Range:	pp. 4467-4478
DOI:	10.1093/mnras/stv2603
Status:	Peer Reviewed
Publication Status:	Published
Funder:	Seventh Framework Programme (European Commission) (FP7), European Research Council (ERC), Science and Technology Facilities Council (Great Britain) (STFC), Fondo Nacional de Desarrollo Científico y Tecnológico (Chile) (FONDECYT), Alfred P. Sloan Foundation, National Science Foundation (U.S.) (NSF), United States. Department of Energy. Office of Science, United States. National Aeronautics and Space Administration (NASA)
Grant number:	(FP/2007-2013) / ERC Grant Agreement n. 320964 (WDTracer), ST/L000733/1 (STFC), 3140585 (FONDECYT), NAS 5-26555 (NASA)
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