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    Multiwavelength observations of the EUV variable metal-rich white dwarf GD 394

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    Author
    Wilson, David J
    Gänsicke, Boris T
    Koester, Detlev
    Toloza, Odette
    Holberg, Jay B
    Preval, Simon P
    Barstow, Martin A
    Belardi, Claudia
    Burleigh, Matthew R
    Casewell, Sarah L
    Cauley, P Wilson
    Chote, Paul
    Farihi, Jay
    Hollands, Mark A
    Long, Knox S
    Redfield, Seth
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    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Issue Date
    2019-03
    Keywords
    circumstellarmatter
    stars: individual: GD394
    stars: variables: general
    white dwarfs
    
    Metadata
    Show full item record
    Publisher
    OXFORD UNIV PRESS
    Citation
    David J Wilson, Boris T Gänsicke, Detlev Koester, Odette Toloza, Jay B Holberg, Simon P Preval, Martin A Barstow, Claudia Belardi, Matthew R Burleigh, Sarah L Casewell, P Wilson Cauley, Paul Chote, Jay Farihi, Mark A Hollands, Knox S Long, Seth Redfield, Multiwavelength observations of the EUV variable metal-rich white dwarf GD 394, Monthly Notices of the Royal Astronomical Society, Volume 483, Issue 3, March 2019, Pages 2941–2957, https://doi.org/10.1093/mnras/sty3218
    Journal
    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
    Rights
    © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present new Hubble Space Telescope (HST) ultraviolet and ground-based optical observations of the hot, metal-rich white dwarf GD394. Extreme-ultraviolet (EUV) observations in 1992-1996 revealed a 1.15 d periodicity with a 25 per cent amplitude, hypothesized to be due to metals in a surface accretion spot. We obtained phase resolved HST/Space Telescope Imaging Spectrograph high resolution far-ultraviolet spectra of GD394 that sample the entire period, along with a large body of supplementary data. We find no evidence for an accretion spot, with the flux, accretion rate, and radial velocity of GD394 constant over the observed time-scales at ultraviolet and optical wavelengths. We speculate that the spot may have no longer been present when our observations were obtained, or that the EUV variability is being caused by an otherwise undetected evaporating planet. The atmospheric parameters obtained from separate fits to optical and ultraviolet spectra are inconsistent, as is found for multiple hot white dwarfs. We also detect non-photospheric, high ionisation absorption lines of multiple volatile elements, which could be evidence for a hot plasma cocoon surrounding the white dwarf.
    ISSN
    0035-8711
    DOI
    10.1093/mnras/sty3218
    Version
    Final published version
    Sponsors
    European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013 / ERC Grant) [320964]; Leverhulme Trust Research Project Grant; NASA [NAS 5-26555]; NASA through a Space Telescope Science Institute [13719]; W. M. Keck Foundation
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/sty3218
    Scopus Count
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    UA Faculty Publications

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