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… 
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References

SHOWING 1-10 OF 79 REFERENCES
The frequency of planetary debris around young white dwarfs
Context. Heavy metals in the atmospheres of white dwarfs are thought in many cases to be accreted from a circumstellar debris disk, which was formed by the tidal disruption of a rocky planetary body
TWO BEYOND-PRIMITIVE EXTRASOLAR PLANETESIMALS
Using the Cosmic Origins Spectrograph on board the Hubble Space Telescope, we have obtained high-resolution ultraviolet observations of GD 362 and PG 1225-079, two helium-dominated, externally
ELEMENTAL COMPOSITIONS OF TWO EXTRASOLAR ROCKY PLANETESIMALS
We report Keck/HIRES and Hubble Space Telescope/COS spectroscopic studies of extrasolar rocky planetesimals accreted onto two hydrogen atmosphere white dwarfs, G29-38 and GD 133. In G29-38, eight
ROCKY EXTRASOLAR PLANETARY COMPOSITIONS DERIVED FROM EXTERNALLY POLLUTED WHITE DWARFS
We report Keck High Resolution Echelle Spectrometer data and model atmosphere analysis of two helium-dominated white dwarfs, PG1225−079 and HS2253+8023, whose heavy pollutions most likely derive from
ACCRETION OF A TERRESTRIAL-LIKE MINOR PLANET BY A WHITE DWARF
We present optical and infrared characterization of the polluted DAZ white dwarf GALEX J193156.8+011745. Imaging and spectroscopy from the ultraviolet to the thermal infrared indicate that this white
CONSTRAINTS ON THE LIFETIMES OF DISKS RESULTING FROM TIDALLY DESTROYED ROCKY PLANETARY BODIES
Spitzer IRAC observations of 15 metal-polluted white dwarfs reveal infrared excesses in the spectral energy distributions of HE 0110−5630, GD 61, and HE 1349−2305. All three of these stars have
Evidence for Water in the Rocky Debris of a Disrupted Extrasolar Minor Planet
TLDR
Detailed spectroscopic analysis of a debris-accreting white dwarf, along with knowledge that such systems accrete this debris from remnants of rocky planetary bodies, is used to derive the water content in a disrupted extrasolar body.
WATER FRACTIONS IN EXTRASOLAR PLANETESIMALS
With the goal of using externally polluted white dwarfs to investigate the water fractions of extrasolar planetesimals, we assemble from the literature a sample that we estimate to be more than 60%
TWO EXTRASOLAR ASTEROIDS WITH LOW VOLATILE-ELEMENT MASS FRACTIONS
Using ultraviolet spectra obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope, we extend our previous ground-based optical determinations of the composition of the extrasolar
INFRARED SIGNATURES OF DISRUPTED MINOR PLANETS AT WHITE DWARFS
Spitzer Space Observatory IRAC and MIPS photometric observations are presented for 20 white dwarfs with Teff ≲ 20, 000 K and metal-contaminated photospheres. A warm circumstellar disk is detected at
...
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