The white dwarf binary pathways survey −III. Contamination from hierarchical triples containing a white dwarf

F. Lagos; M. R. Schreiber; S. G. Parsons; A. Zurlo; D. Mesa; B. T. Gänsicke; R. Brahm; C. Caceres; H. Canovas; M. S. Hernandez; A. Jordan; D. Koester; L. Schmidtobreick; C. Tappert; M. Zorotovic

doi:10.1093/mnras/staa747

The white dwarf binary pathways survey −III. Contamination from hierarchical triples containing a white dwarf

F. Lagos, M. R. Schreiber, S. G. Parsons, A. Zurlo, D. Mesa, B. T. Gänsicke, R. Brahm, C. Caceres, H. Canovas, M. S. Hernandez, A. Jordan, D. Koester, L. Schmidtobreick, C. Tappert, M. Zorotovic

Exact Sciences School

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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 d might be hierarchical triples.

Original language	English
Pages (from-to)	915-922
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	494
Issue number	1
DOIs	https://doi.org/10.1093/mnras/staa747
Publication status	Published - 1 May 2020

Keywords

Binaries: close
Dynamics
Methods: numerical
Methods: statistical
Stars: kinematics

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1093/mnras/staa747

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Lagos, F., Schreiber, M. R., Parsons, S. G., Zurlo, A., Mesa, D., Gänsicke, B. T., Brahm, R., Caceres, C., Canovas, H., Hernandez, M. S., Jordan, A., Koester, D., Schmidtobreick, L., Tappert, C., & Zorotovic, M. (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), 915-922. https://doi.org/10.1093/mnras/staa747

@article{5dcd888121ee4f589e788ad101720e7f,

title = "The white dwarf binary pathways survey −III. Contamination from hierarchical triples containing a white dwarf",

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 d might be hierarchical triples.",

keywords = "Binaries: close, Dynamics, Methods: numerical, Methods: statistical, Stars: kinematics",

author = "F. Lagos and Schreiber, {M. R.} and Parsons, {S. G.} and A. Zurlo and D. Mesa and G{\"a}nsicke, {B. T.} and R. Brahm and C. Caceres and H. Canovas and Hernandez, {M. S.} and A. Jordan and D. Koester and L. Schmidtobreick and C. Tappert and M. Zorotovic",

note = "Funding Information: MRS acknowledges financial support from FONDECYT (grant number 1181404). SGP acknowledges the support of the STFC Ernest Rutherford Fellowship. AZ acknowledges support from the CONICYT/PAI (grant PAI77170087). BTG was supported by the UK STFC grant ST/P000495. RB acknowledges support from FONDECYT Post-doctoral Fellowship Project 3180246, and from the Millennium. Institute of Astrophysics (MAS). CC acknowledges support from DGI-UNAB project DI-11-19/R. MSH thanks Doctorado Nacional CONICYT 2017 folio 21170070. CT acknowledges financial support from Fondecyt No. 1170566. MZ acknowledges support from CONICYT/PAI (grant 79170121) and CONICYT/FONDECYT (grant 11170559). We also thank the referee Steve B. Howell for helpful suggestions that improved the presentation of this paper. Publisher Copyright: {\textcopyright} 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society",

year = "2020",

month = may,

day = "1",

doi = "10.1093/mnras/staa747",

language = "English",

volume = "494",

pages = "915--922",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

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Lagos, F, Schreiber, MR, Parsons, SG, Zurlo, A, Mesa, D, Gänsicke, BT, Brahm, R, Caceres, C, Canovas, H, Hernandez, MS, Jordan, A, Koester, D, Schmidtobreick, L, Tappert, C & Zorotovic, M 2020, 'The white dwarf binary pathways survey −III. Contamination from hierarchical triples containing a white dwarf', Monthly Notices of the Royal Astronomical Society, vol. 494, no. 1, pp. 915-922. https://doi.org/10.1093/mnras/staa747

TY - JOUR

T1 - The white dwarf binary pathways survey −III. Contamination from hierarchical triples containing a white dwarf

AU - Lagos, F.

AU - Schreiber, M. R.

AU - Parsons, S. G.

AU - Zurlo, A.

AU - Mesa, D.

AU - Gänsicke, B. T.

AU - Brahm, R.

AU - Caceres, C.

AU - Canovas, H.

AU - Hernandez, M. S.

AU - Jordan, A.

AU - Koester, D.

AU - Schmidtobreick, L.

AU - Tappert, C.

AU - Zorotovic, M.

N1 - Funding Information: MRS acknowledges financial support from FONDECYT (grant number 1181404). SGP acknowledges the support of the STFC Ernest Rutherford Fellowship. AZ acknowledges support from the CONICYT/PAI (grant PAI77170087). BTG was supported by the UK STFC grant ST/P000495. RB acknowledges support from FONDECYT Post-doctoral Fellowship Project 3180246, and from the Millennium. Institute of Astrophysics (MAS). CC acknowledges support from DGI-UNAB project DI-11-19/R. MSH thanks Doctorado Nacional CONICYT 2017 folio 21170070. CT acknowledges financial support from Fondecyt No. 1170566. MZ acknowledges support from CONICYT/PAI (grant 79170121) and CONICYT/FONDECYT (grant 11170559). We also thank the referee Steve B. Howell for helpful suggestions that improved the presentation of this paper. Publisher Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

PY - 2020/5/1

Y1 - 2020/5/1

N2 - 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.

AB - 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.

KW - Binaries: close

KW - Dynamics

KW - Methods: numerical

KW - Methods: statistical

KW - Stars: kinematics

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U2 - 10.1093/mnras/staa747

DO - 10.1093/mnras/staa747

M3 - Review article

AN - SCOPUS:85085380088

SN - 0035-8711

VL - 494

SP - 915

EP - 922

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

The white dwarf binary pathways survey −III. Contamination from hierarchical triples containing a white dwarf

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