Lagos, F., Schreiber, M.R., Parsons, S.G. orcid.org/0000-0002-2695-2654 et al. (12 more authors) (2020) The white dwarf binary pathways survey III: contamination from hierarchical triples containing a white dwarf. Monthly Notices of the Royal Astronomical Society, 494 (1). pp. 915-922. ISSN 0035-8711
Abstract
The White Dwarf Binary Pathways Survey aims at increasing the number of known detached A, F, G and K main sequence stars in close orbits with white dwarf companions (WD+AFGK binaries) to refine our understanding about compact binary evolution and the nature of Supernova Ia progenitors. These close WD+AFGK binary stars are expected to form through common envelope evolution, in which tidal forces tend to circularize the orbit. However, some of the identified WD+AFGK binary candidates show eccentric orbits, indicating that these systems are either formed through a different mechanism or perhaps they are not close WD+AFGK binaries. We observed one of these eccentric WD+AFGK binaries with SPHERE and find that the system TYC 7218-934-1 is in fact a triple system where the WD is a distant companion. The inner binary likely consists of the G-type star plus an unseen low mass companion in an eccentric orbit. Based on this finding, we estimate the fraction of triple systems that could contaminate the WD+AFGK sample. We find that less than 15 per cent of our targets with orbital periods shorter than 100 days might be hierarchical triples.
Metadata
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Copyright, Publisher and Additional Information: | © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. This is an author-produced version of a paper subsequently published in Monthly Notices of the Royal Astronomical Society. Uploaded in accordance with the publisher's self-archiving policy. | ||||
Keywords: | binaries (including multiple): close; stars: kinematics and dynamics; methods: numerical, statistical | ||||
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Institution: | The University of Sheffield | ||||
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield) | ||||
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Depositing User: | Symplectic Sheffield | ||||
Date Deposited: | 25 Mar 2020 10:38 | ||||
Last Modified: | 14 Dec 2021 18:33 | ||||
Status: | Published | ||||
Publisher: | Oxford University Press (OUP) | ||||
Refereed: | Yes | ||||
Identification Number: | https://doi.org/10.1093/mnras/staa747 | ||||
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