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Near-infrared spectroscopy of the very low mass companion to the hot da white dwarf PG 1234+482

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posted on 2012-10-24, 09:04 authored by P. R. Steele, M. R. Burleigh, M. A. Barstow, P. D. Dobbie
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.

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Citation

Monthly Notices of the Royal Astronomical Society, 2007, 382 (4), pp. 1804-1808

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Royal Astronomical Society (RAS)

issn

0035-8711

eissn

1365-2966

Copyright date

2007

Available date

2012-10-24

Publisher version

http://mnras.oxfordjournals.org/content/382/4/1804

Language

en

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