Steele, PR;
Burleigh, MR;
Farihi, J;
Gänsicke, BT;
Jameson, RF;
Dobbie, PD;
Barstow, MA;
(2009)
PHL 5038: A spatially resolved white dwarf + brown dwarf binary.
Astronomy and Astrophysics
, 500
(3)
pp. 1207-1210.
10.1051/0004-6361/200911694.
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Abstract
A near-infrared excess is detected at the white dwarf PHL 5038 in UKIDSS photometry, consistent with the presence of a cool, substellar companion. We have obtained H-and K-grism spectra and images of PHL 5038 using NIRI on Gemini North. The target is spatially and spectrally resolved into two components: an 8000 K DA white dwarf, and a likely L8 brown dwarf companion, separated by 0.94″. The spectral type of the secondary was determined using standard spectral indices for late L and T dwarfs. The projected orbital separation of the binary is 55 AU, so it becomes only the second known wide WD+dL binary to be found after GD 165AB. This object could potentially be used as a benchmark for testing substellar evolutionary models at intermediate to older ages.
| Type: | Article |
|---|---|
| Title: | PHL 5038: A spatially resolved white dwarf + brown dwarf binary |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/200911694 |
| Publisher version: | http://dx.doi.org/10.1051/0004-6361/200911694 |
| Language: | English |
| Additional information: | Reproduced with permission from Astronomy & Astrophysics, © ESO. |
| Keywords: | white dwarfs -- stars: low-mass, brown dwarfs -- binaries: general -- binaries: visual |
| 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/1477420 |
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