Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83
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Cita com:
hdl:2117/360216
Tipus de documentArticle
Data publicació2021-03
EditorOxford University Press
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
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 (IR) 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 IR excess gives a temperature of 910 ± 50 K. We have estimated a total accretion flux from the spectroscopic metal lines of |M¿|=1.784×109g s-1.
CitacióGonzález, E. [et al.]. Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83. "Monthly notices of the Royal Astronomical Society", Març 2021, vol. 501, núm. 3, p. 3916-3925.
ISSN1365-2966
Versió de l'editorhttps://academic.oup.com/mnras/article-abstract/501/3/3916/6032183
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