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Two white dwarfs in ultrashort binaries with detached, eclipsing, likely sub-stellar companions detected by K2

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Parsons, S. G., Hermes, J. J., Marsh, T. R., Gaensicke, B. T. (Boris T.), Tremblay, Pier-Emmanuel, Littlefair, S. P., Sahman, D. I., Ashley, R. P., Green, Matthew J., Rattanasoon, S. et al.
(2017) Two white dwarfs in ultrashort binaries with detached, eclipsing, likely sub-stellar companions detected by K2. Monthly Notices of the Royal Astronomical Society, 471 (1). pp. 976-986. doi:10.1093/mnras/stx1610

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Official URL: https://doi.org/10.1093/mnras/stx1610

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Abstract

Using data from the extended Kepler mission in K2 Campaign 10, we identify two eclipsing binaries containing white dwarfs with cool companions that have extremely short orbital periods of only 71.2 min (SDSS J1205−0242, a.k.a. EPIC 201283111) and 72.5 min (SDSS J1231+0041, a.k.a. EPIC 248368963). Despite their short periods, both systems are detached with small, low-mass companions, in one case a brown dwarf and in the other case either a brown dwarf or a low-mass star. We present follow-up photometry and spectroscopy of both binaries, as well as phase-resolved spectroscopy of the brighter system, and use these data to place preliminary estimates on the physical and binary parameters. SDSS J1205−0242 is composed of a 0.39 ± 0.02 M⊙ helium-core white dwarf that is totally eclipsed by a 0.049 ± 0.006 M⊙ (51 ± 6MJ) brown-dwarf companion, while SDSS J1231+0041 is composed of a 0.56 ± 0.07 M⊙ white dwarf that is partially eclipsed by a companion of mass ≲0.095  M⊙. In the case of SDSS J1205−0242, we look at the combined constraints from common-envelope evolution and brown-dwarf models; the system is compatible with similar constraints from other post-common-envelope binaries, given the current parameter uncertainties, but has potential for future refinement.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
SWORD Depositor: Library Publications Router
Library of Congress Subject Headings (LCSH): White dwarf stars
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press (OUP)
ISSN: 1365-2966
Official Date: 11 October 2017
Dates:
DateEvent
11 October 2017Published
26 June 2017Available
22 June 2017Accepted
Volume: 471
Number: 1
Page Range: pp. 976-986
DOI: 10.1093/mnras/stx1610
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: The Author(s)
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275
340040Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
320964 (WDTracer)Seventh Framework Programmehttp://dx.doi.org/10.13039/100011102
677706-WD3DH2020 European Research Councilhttp://dx.doi.org/10.13039/100010663
ST/L000733[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
ST/M001350[STFC] Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDNational Research Foundationhttp://dx.doi.org/10.13039/100011512
HST-HF2-51357.001-A[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
NNX17AE92G[NASA] National Aeronautics and Space Administrationhttp://dx.doi.org/10.13039/100000104
AST-1413001National Science Foundationhttp://dx.doi.org/10.13039/100000001
AST-1312983National Science Foundationhttp://dx.doi.org/10.13039/100000001

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