Steele, P. R., Burleigh, Matthew R., Farihi, Jay, Gänsicke, B. T. (Boris T.), Jameson, R. F., Dr., Dobbie, P. D. and Barstow, Martin A. (Martin Adrian), 1958-. (2009) PHL 5038: a spatially resolved white dwarf + brown dwarf binary. Astronomy & Astrophysics, Vol.500 (No.3). pp. 1207-1210. ISSN 0004-6361

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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 $0.94\arcsec$. 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
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of 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
Date:	8 April 2009
Volume:	Vol.500
Number:	No.3
Number of Pages:	4
Page Range:	pp. 1207-1210
Identification Number:	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)
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URI:	http://wrap.warwick.ac.uk/id/eprint/2216

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