WD1032 + 011, an inflated brown dwarf in an old eclipsing binary with a white dwarf
| Autor: | T. R. Marsh, Don Winget, Boris T. Gänsicke, V. S. Dhillon, S. P. Littlefair, Zachary P. Vanderbosch, Claudia Belardi, John H. Debes, Sarah L. Casewell, J. J. Hermes, I. P. Braker, Steven G. Parsons, K. I. Winget, Matthew R. Burleigh |
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| Rok vydání: | 2020 |
| Předmět: |
Earth and Planetary Astrophysics (astro-ph.EP)
Physics 010308 nuclear & particles physics Brown dwarf FOS: Physical sciences Binary number White dwarf Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics 01 natural sciences Photometry (optics) Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science 0103 physical sciences Thick disk Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics 10. No inequality Low Mass 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society. 497:3571-3580 |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | 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. Accepted for publication in MNRAS, 11 pages, 7 Figures |
| Databáze: | OpenAIRE |
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