WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
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DOI：
10.1093/mnras/staa1608
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发表时间：
2020-06
影响因子：
4.8
通讯作者：
S. Casewell;C. Belardi;S. Parsons;S. Littlefair;I. Braker;J. Hermes;J. Debes;Z. Vanderbosch
中科院分区：
文献类型：
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作者：
S. Casewell;C. Belardi;S. Parsons;S. Littlefair;I. Braker;J. Hermes;J. Debes;Z. Vanderbosch
我们介绍了已知的第三颗褐矮星的发现，它使非吸积白矮星黯然失色。盖亚视差信息和多色光度测定证实白矮星温度较低（9950$\pm$150K）且质量较低（0.45$\pm$0.05~MSun），光谱和光曲线表明棕矮星的质量为0.067 $\pm$0.006 MSun (70 MJup)，光谱类型为L5 $\pm$1。该系统的运动学表明，该双星很可能是厚盘的一员，因此年龄至少为 5 吉里。高节奏的光曲线表明褐矮星正在膨胀，使其成为食白矮星-褐矮星双星中的第一颗褐矮星。
We present the discovery of only the third brown dwarf known to eclipse a non-accreting white dwarf. Gaia parallax information and multi-colour photometry confirm that the white dwarf is cool (9950$\pm$150K) and has a low mass (0.45$\pm$0.05~MSun), and spectra and lightcurves suggest the brown dwarf has a mass of 0.067 $\pm$0.006 MSun (70 MJup) and a spectral type of L5 $\pm$1. The kinematics of the system show that the binary is likely to be a member of the thick disk and therefore at least 5 Gyr old. The high cadence lightcurves show that the brown dwarf is inflated, making it the first brown dwarf in an eclipsing white dwarf-brown dwarf binary to be so.