Littlefair, S.P., Casewell, S.L., Parsons, S.G. et al. (14 more authors) (2014) The substellar companion in the eclipsing white dwarf binary SDSS J141126.20+200911.1. Monthly Notices of the Royal Astronomical Society, 445 (2). pp. 2106-2115. ISSN 0035-8711
Abstract
We present high time resolution SDSS-g′ and SDSS-z′ light curves of the primary eclipse in SDSS J141126.20+200911.1, together with time-resolved X-Shooter spectroscopy and near-infrared (NIR) JHKs photometry. Our observations confirm the substellar nature of the companion, making SDSS J141126.20+200911.1 the first eclipsing white dwarf/brown dwarf binary known. We measure a (white dwarf model dependent) mass and radius for the brown dwarf companion of M2 = 0.050 ± 0.002 M⊙ and R2 = 0.072 ± 0.004 M⊙, respectively. The lack of a robust detection of the companion light in the z′-band eclipse constrains the spectral type of the companion to be later than L5. Comparing the NIR photometry to the expected white dwarf flux reveals a clear Ks-band excess, suggesting a spectral type in the range L7–T1. The radius measurement is consistent with the predictions of evolutionary models, and suggests a system age in excess of 3 Gyr. The low companion mass is inconsistent with the inferred spectral type of L7–T1, instead predicting a spectral type nearer T5. This indicates that irradiation of the companion in SDSS J141126.20+200911.1 could be causing a significant temperature increase, at least on one hemisphere.
Metadata
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Copyright, Publisher and Additional Information: | © 2014 The Authors. 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: close; binaries: eclipsing | ||||||||
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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: | 21 Sep 2016 11:18 | ||||||||
Last Modified: | 29 Mar 2018 11:49 | ||||||||
Published Version: | http://dx.doi.org/10.1093/mnras/stu1895 | ||||||||
Status: | Published | ||||||||
Publisher: | Oxford University Press | ||||||||
Refereed: | Yes | ||||||||
Identification Number: | https://doi.org/10.1093/mnras/stu1895 | ||||||||
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