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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; Dhillon, V S; Marsh, T R; Winget, D E; Winget, K I
Monthly Notices of the Royal Astronomical Society, 09/2020, Letnik: 497, Številka: 3Journal Article
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.
