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Metal-rich debris discs around white dwarfs
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Gänsicke, B. T. (Boris T.), Marsh, T. R., Southworth, J. (John) and Rebassa-Mansergas, A. (2008) Metal-rich debris discs around white dwarfs. In: Conference on Extreme Solar Systems, Santorini, Greece, Jun 25-29, 2007. Published in: Astronomical Society of the Pacific Conference Series, Volume 398 pp. 149-154. ISBN 978-1-58381-666-0. ISSN 1050-3390.
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Abstract
We have identified two moderately hot (similar to 18000-22000 K) white dwarfs, SDSS J1228+1040 and SDSS J1043+0855, which exhibit double-peaked emission lines in the Call lambda lambda 8600 triplet. These line profiles are unambiguous signatures of gaseous discs with outer radii of similar to 1R(circle dot) orbiting the two white dwarfs. Both stars accrete from the circumstellar material, resulting in large photospheric Mg abundances. The absence of hydrogen emission from the discs, and helium absorption in the white dwarf photospheres demonstrates that the circumstellar material is depleted in volatile elements, and the most likely origin of these gaseous rings are tidally disrupted rocky asteroids. The relatively high mass of SDSS J1228+1040 implies that planetary systems can not only form around 4-5 M-circle dot stars, but may also survive their post main-sequence evolution.
| Item Type: | Conference Item (UNSPECIFIED) | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy | ||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Disks (Astrophysics), Circumstellar matter | ||||
| Series Name: | ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES | ||||
| Journal or Publication Title: | Astronomical Society of the Pacific Conference Series | ||||
| Publisher: | Astronomical Society of the Pacific | ||||
| ISBN: | 978-1-58381-666-0 | ||||
| ISSN: | 1050-3390 | ||||
| Editor: | Fischer, D and Rasio, FA and Thorsett, SE and Wolszczan, A | ||||
| Official Date: | 2008 | ||||
| Dates: |
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| Volume: | Volume 398 | ||||
| Number of Pages: | 6 | ||||
| Page Range: | pp. 149-154 | ||||
| Status: | Not Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||
| Title of Event: | Conference on Extreme Solar Systems | ||||
| Type of Event: | Conference | ||||
| Location of Event: | Santorini, Greece | ||||
| Date(s) of Event: | Jun 25-29, 2007 |
Data sourced from Thomson Reuters' Web of Knowledge
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