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    The closest extremely low-mass white dwarf to the Sun

    80121.pdf (491.5Kb)
    Access Status
    Open access
    Authors
    Kawka, Adela
    Simpson, Jeffrey D
    Vennes, Stephane
    Bessell, Michael S
    Da Costa, Gary S
    Marino, Anna F
    Murphy, Simon J
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kawka, A. and Simpson, J.D. and Vennes, S. and Bessell, M.S. and Da Costa, G.S. and Marino, A.F. and Murphy, S.J. 2020. The closest extremely low-mass white dwarf to the Sun. Monthly Notices of the Royal Astronomical Society: Letters. 495 (1): pp. L129-L134.
    Source Title
    Monthly Notices of the Royal Astronomical Society: Letters
    DOI
    10.1093/mnrasl/slaa068
    Additional URLs
    http://dx.doi.org/10.1093/mnrasl/slaa068
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Electrical Engineering, Computing and Mathematical Sciences (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP180101791
    http://purl.org/au-research/grants/arc/DP150103294
    Remarks

    This is a pre-copyedited, author-produced version of an article accepted for publication in Monthly Notices of the Royal Astronomical Society: Letters, following peer review. The version of record Kawka, A. and Simpson, J.D. and Vennes, S. and Bessell, M.S. and Da Costa, G.S. and Marino, A.F. and Murphy, S.J. 2020. The closest extremely low-mass white dwarf to the Sun. Monthly Notices of the Royal Astronomical Society. 495 (1): pp. L129-L134 is available online at: https://doi.org/10.1093/mnrasl/slaa068.

    URI
    http://hdl.handle.net/20.500.11937/80039
    Collection
    • Curtin Research Publications
    Abstract

    We present the orbit and properties of 2MASS J050051.85-093054.9, establishing it as the closest (d ~ 71 pc) extremely low mass white dwarf to the Sun. We find that this star is hydrogen-rich with Teff ~ 10 500 K, log g ~ 5.9, and, following evolutionary models, has a mass of ~ 0.17 solar masses. Independent analysis of radial velocity and TESS photometric time series reveals an orbital period of ~ 9.5 h. Its high velocity amplitude (K ~ 144 km/s) produces a measurable Doppler beaming effect in the TESS light curve with an amplitude of 1 mmag. The unseen companion is most likely a faint white dwarf. J0500-0930 belongs to a class of post-common envelope systems that will most likely merge through unstable mass transfer and in specific circumstances lead to Type Ia supernova explosions.

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