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Title: Near-infrared spectroscopy of the very low mass companion to the hot da white dwarf PG 1234+482
Authors: Steele, P. R.
Burleigh, M. R.
Barstow, M. A.
Dobbie, P. D.
First Published: 21-Dec-2007
Publisher: Royal Astronomical Society (RAS)
Citation: Monthly Notices of the Royal Astronomical Society, 2007, 382 (4), pp. 1804-1808
Abstract: We present a near-infrared spectrum of the hot (Teff≈ 55 000 K) hydrogen atmosphere (DA) white dwarf PG 1234+482. We confirm that a very low mass companion is responsible for the previously recognized infrared photometric excess. We compare spectra of M and L dwarfs, combined with an appropriate white dwarf model, to the data to constrain the spectral type of the secondary. We find that uncertainties in the Two-Micron All-Sky Survey HK photometry of the white dwarf prevent us from distinguishing whether the secondary is stellar or substellar, and assign a spectral type of L0±1 (M9–L1).Therefore, this is the hottest and youngest (≈106 yr) DA white dwarf with a possible brown dwarf companion.
DOI Link: 10.1111/j.1365-2966.2007.12481.x
ISSN: 0035-8711
eISSN: 1365-2966
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2007 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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