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        Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83

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        Author
        Egea, E. González
        Koester, D.
        Rogers, L. K.
        Marocco, F.
        Cooper, W. J.
        Beamin, J. C.
        Burningham, B.
        Day-Jones, A.
        Forbrich, J.
        Pinfield, D. J.
        Attention
        2299/23698
        Abstract
        Spectroscopic observations of white dwarfs reveal that many of them are polluted by exoplanetary material, whose bulk composition can be uniquely probed this way. We present a spectroscopic and photometric analysis of the DA white dwarf WDJ181417.84$-$735459.83, an object originally identified to have a strong infrared excess in the 2MASS and WISE catalogues that we confirmed to be intrinsic to the white dwarf, and likely corresponding to the emission of a dusty disc around the star. The finding of Ca, Fe and Mg absorption lines in two X-SHOOTER spectra of the white dwarf, taken 8 years apart, is further evidence of accretion from a dusty disc. We do not report variability in the absorption lines between these two spectra. Fitting a blackbody model to the infrared excess gives a temperature of 910$\pm50$ K. We have estimated a total accretion flux from the spectroscopic metal lines of $|\dot{\rm M}| = 1.784 \times 10^{9}\, $g s$^{-1}$.
        Publication date
        2020-12-12
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/staa3836
        License
        Other
        Other links
        http://hdl.handle.net/2299/23698
        Relations
        School of Physics, Engineering & Computer Science
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