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PHL 5038: a spatially resolved white dwarf + brown dwarf binary


Steele, PR and Burleigh, MR and Farihi, J and Gansicke, BT and Jameson, RF and Dobbie, PD and Barstow, MA, PHL 5038: a spatially resolved white dwarf + brown dwarf binary, Astronomy and Astrophysics: A European Journal, 500, (3) pp. 1207 - 1210. ISSN 0004-6361 (2009) [Refereed Article]


Copyright Statement

Copyright 2009 ESO

DOI: doi:10.1051/0004-6361/200911694


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.

Item Details

Item Type:Refereed Article
Keywords:white dwarfs -- stars: low-mass, brown dwarfs -- binaries: general -- binaries: visual
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81027
Year Published:2009
Web of Science® Times Cited:26
Deposited By:Mathematics and Physics
Deposited On:2012-11-21
Last Modified:2013-06-27
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