The Composition Of A Disrupted Extrasolar Planetesimal At SDSS J0845+2257 (Ton 345)

@article{Wilson2015TheCO,
  title={The Composition Of A Disrupted Extrasolar Planetesimal At SDSS J0845+2257 (Ton 345)},
  author={David J. Wilson and Boris T. Gaensicke and Detlev Koester and Odette Toloza and Anna F. Pala and Elm{\'e} Breedt and Steven G Parsons},
  journal={arXiv: Earth and Planetary Astrophysics},
  year={2015}
}
We present a detailed study of the metal-polluted DB white dwarf SDSS J0845+2257 (Ton 345). Using high-resolution HST/COS and VLT spectroscopy, we have detected hydrogen and eleven metals in the atmosphere of the white dwarf. The origin of these metals is almost certainly the circumstellar disc of dusty and gaseous debris from a tidally-disrupted planetesimal, accreting at a rate of 1.6E10 gs^-1. Studying the chemical abundances of the accreted material demonstrates that the planetesimal had a… Expand
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