Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 445, Issue 2, Pages 2106-2115Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1895
Keywords
binaries: close; binaries: eclipsing
Categories
Funding
- STFC [ST/J001589/1, ST/L000733/1]
- Royal Astronomical Society [IE120385]
- FONDECYT [3140585]
- College of Science and Engineering at the University of Leicester
- Foundation for Fundamental Research on Matter (FOM) part of the Netherlands Organization for Scientific Research (NWO)
- European Southern Observatory [192.D-0270]
- STFC [ST/J001589/1, ST/M002012/1, ST/L001306/1, ST/K002783/1, ST/L000733/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001589/1, ST/L000733/1, ST/L001306/1, ST/M002012/1, ST/K002783/1] Funding Source: researchfish
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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 M-2 = 0.050 +/- 0.002M(circle dot) and R-2 = 0.072 +/- 0.004M(circle dot), 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.
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