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Near-infrared spectroscopy of the very low mass companion to the hot DA white dwarf PG 1234+482
journal contribution
posted on 2023-05-17, 14:31 authored by Steele, PR, Burleigh, MR, Dobbie, PD, Barstow, MAWe 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.
History
Publication title
Monthly Notices of the Royal Astronomical SocietyVolume
382Issue
4Pagination
1804-1808ISSN
0035-8711Department/School
School of Natural SciencesPublisher
Blackwell Publishing LtdPlace of publication
9600 Garsington Rd, Oxford, England, Oxon, Ox4 2DgRights statement
Copyright 2007 The Authors. Journal compilation 2007 RASRepository Status
- Restricted