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Close Binary Progenitors and Ejected Companions of Thermonuclear Supernovae

Geier, S. and Kupfer, T. and Heber, U. and Nemeth, P. and Ziegerer, E. and Irrgang, A. and Schindewolf, M. and Marsh, T. R. and Gänsicke, B. T. and Barlow, B. N. and Bloemen, S. (2017) Close Binary Progenitors and Ejected Companions of Thermonuclear Supernovae. In: 20th European Workshop on White Dwarfs (EuroWD16). Astronomical Society of the Pacific Conference Series. No.509. Astronomical Society of the Pacific , San Francisco, CA, pp. 79-83. ISBN 978-1-58381-903-6.

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Hot subdwarf stars (sdO/Bs) are evolved core helium-burning stars with very thin hydrogen envelopes, which can be formed by common envelope ejection. Close sdB binaries with massive white dwarf (WD) companions are potential progenitors of thermonuclear supernovae type Ia (SN Ia). We discovered such a progenitor candidate as well as a candidate for a surviving companion star, which escapes from the Galaxy. More candidates for both types of objects have been found by cross-matching known sdB stars with proper motion and light curve catalogues. We found 72 sdO/B candidates with high Galactic restframe velocities, 12 of them might be unbound to our Galaxy. Furthermore, we discovered the second-most compact sdB+WD binary known. However, due to the low mass of the WD companion, it is unlikely to be a SN Ia progenitor.

Item Type:Book Section
Related URLs:
URLURL TypeDescription Paper
Geier, S.0000-0002-3948-9339
Kupfer, T.0000-0002-6540-1484
Heber, U.0000-0001-7798-6769
Irrgang, A.0000-0002-0465-3725
Marsh, T. R.0000-0002-2498-7589
Gänsicke, B. T.0000-0002-2761-3005
Barlow, B. N.0000-0002-8558-4353
Additional Information:© 2017 Astronomical Society of the Pacific.
Series Name:Astronomical Society of the Pacific Conference Series
Issue or Number:509
Record Number:CaltechAUTHORS:20170609-065824600
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78039
Deposited By: Ruth Sustaita
Deposited On:09 Jun 2017 16:13
Last Modified:09 Mar 2020 13:19

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