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PHL 5038: a spatially resolved white dwarf + brown dwarf binary
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Steele, P. R., Burleigh, Matthew R., Farihi, Jay, Gaensicke, B. T., Jameson, R. F., Dobbie, P. D. and Barstow, Martin A. (2009) PHL 5038: a spatially resolved white dwarf + brown dwarf binary. Astronomy & Astrophysics, Vol.500 (No.3). pp. 1207-1210. doi:10.1051/0004-6361/200911694 ISSN 0004-6361.
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Official URL: http://dx.doi.org/10.1051/0004-6361/200911694
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 $0.94\arcsec$. 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.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
Library of Congress Subject Headings (LCSH): | UKIRT Infrared Deep Sky Survey, White dwarf stars, Double stars -- Research, Brown dwarf stars, Compact objects (Astronomy), Low mass stars | ||||
Journal or Publication Title: | Astronomy & Astrophysics | ||||
Publisher: | EDP Sciences | ||||
ISSN: | 0004-6361 | ||||
Official Date: | 8 April 2009 | ||||
Dates: |
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Volume: | Vol.500 | ||||
Number: | No.3 | ||||
Number of Pages: | 4 | ||||
Page Range: | pp. 1207-1210 | ||||
DOI: | 10.1051/0004-6361/200911694 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Science and Technology Facilities Council (Great Britain) (STFC) |
Data sourced from Thomson Reuters' Web of Knowledge
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