期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 494, 期 1, 页码 915-922出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa747
关键词
methods: numerical; methods: statistical; binaries: close; stars: kinematics and dynamics
资金
- FONDECYT [1181404, 3180246, 1170566]
- STFC Ernest Rutherford Fellowship
- UK STFC [ST/P000495]
- Millennium. Institute of Astrophysics (MAS)
- DGI-UNAB project [DI-11-19/R]
- Doctorado Nacional CONICYT [21170070]
- CONICYT/PAI [79170121, PAI77170087]
- CONICYT/FONDECYT [11170559]
- STFC [ST/R003424/1] Funding Source: UKRI
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 d might be hierarchical triples.
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