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|Title:||The substellar companion in the eclipsing white dwarf binary SDSS J141126.20+200911.1|
|Authors:||Littlefair, S. P.|
Casewell, Sarah L.
Parsons, S. G.
Dhillon, V. S.
Marsh, T. R.
Gaensicke, B. T.
Hardy, L. K.
Bours, M. C. P.
Burleigh, Matthew R.
|Publisher:||Oxford University Press for Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 2014, 445 (2), pp. 2106-2115|
|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.|
|Rights:||Copyright © 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy.|
|Description:||This article has been accepted for publication in MNRAS ©: 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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