A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance

Details A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance

2005-09-07

arxiv.org/abs/astro-ph/0509193v1

Astrophys.J.632:L119-L122,2005

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures. ApJ Letters, in press

Scientific paper

10.1086/497826

Eighteen years after an infrared excess was discovered associated with the white dwarf G29-38, we report ground-based measurements (JHKL'N') with mJy-level sensitivity of GD 362 that show it to be a second single white dwarf with an infrared excess. As a first approximation, the excess around GD 362, which amounts to about 3% of the total stellar luminosity, can be explained by emission from a passive, flat, opaque dust disk that lies within the Roche radius of the white dwarf. The dust may have been produced by the tidal disruption of a large parent body such as an asteroid. Accretion from this circumstellar disk could account for the remarkably high abundance of metals in the star's photosphere.

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