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WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf

https://doi.org/10.1093/mnras/staa1608

Casewell, S L ; Belardi, C ; Parsons, S G ; Littlefair, S P ; Braker, I P ; Hermes, J J ; Debes, J ; Vanderbosch, Z ; Burleigh, M R ; Gänsicke, B T ; et al ( September 2020 , Monthly Notices of the Royal Astronomical Society)
null (Ed.)
ABSTRACT We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multicolour photometry confirm that the white dwarf is cool (9950 ± 150 K) and has a low mass (0.45 ± 0.05 M⊙), and spectra and light curves suggest the brown dwarf has a mass of 0.067 ± 0.006 M⊙ (70MJup) and a spectral type of L5 ± 1. The kinematics of the system show that the binary is likely to be a member of the thick disc and therefore at least 5-Gyr old. The high-cadence light curves show that the brown dwarf is inflated, making it the first brown dwarf in an eclipsing white dwarf-brown dwarf binary to be so.
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