Farihi, J;
Christopher, M;
(2004)
A Possible Brown Dwarf Companion to the White Dwarf GD 1400.
The Astronomical Journal
, 128
(4)
pp. 1868-1871.
10.1086/423919.
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Abstract
An unresolved, likely L dwarf companion to the DA white dwarf GD 1400 is reported. This would be only the second such system known, discovered 17 years after the prototype L dwarf, GD 165B, was determined to be a companion to a white dwarf. Photometric observations and model-predicted of the well-studied white dwarf primary stellar parameters indicate that GD 1400B has J - K gsim 2.0 and MK = 12.13 mag. If correct, this would place GD 1400B at spectral type L6, and it would be the lowest-luminosity unevolved companion known to a white dwarf and thus a definite brown dwarf. However, a low-resolution Keck NIRSPEC 2.1–2.4 μm spectrum may not be consistent with known L dwarfs. Uncertainties in classification will remain until the binary is resolved or a trigonometric parallax is measured.
| Type: | Article |
|---|---|
| Title: | A Possible Brown Dwarf Companion to the White Dwarf GD 1400 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1086/423919 |
| Publisher version: | http://dx.doi.org/10.1086/423919 |
| Language: | English |
| Additional information: | Copyright © 2004. The American Astronomical Society. All rights reserved. |
| Keywords: | binaries: general; stars: individual (GD 1400) ; stars: low-mass, brown dwarfs; white dwarfs |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1477417 |
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