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Doppler imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9

Manser, Christopher J.; Gänsicke, Boris T.; Marsh, Thomas R.; Veras, Dimitri; Koester, Detlev; Breedt, Elmé; Pala, Anna F.; Parsons, Steven G.; Southworth, John

Doppler imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9 Thumbnail


Authors

Christopher J. Manser

Boris T. Gänsicke

Thomas R. Marsh

Dimitri Veras

Detlev Koester

Elmé Breedt

Anna F. Pala

Steven G. Parsons



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.

Journal Article Type Article
Acceptance Date Nov 3, 2015
Online Publication Date Dec 10, 2015
Publication Date Feb 1, 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 455
Issue 4
Pages 4467 -4478
DOI https://doi.org/10.1093/mnras/stv2603
Keywords astrophysics, accretion, accretion discs line, profiles, circumstellar matter, stars, SDSS J122859.93+104032.9, white dwarfs
Publisher URL http://dx.doi.org/10.1093/mnras/stv2603

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