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WD1032+011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
- Publication Year :
- 2020
-
Abstract
- 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.<br />Comment: Accepted for publication in MNRAS, 11 pages, 7 Figures
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.2006.09417
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1093/mnras/staa1608