Externally-polluted white dwarfs with dust disks

Details Externally-polluted white dwarfs with dust disks Externally-polluted white dwarfs with dust disks

2007-04-10

arxiv.org/abs/0704.1170v1

Astrophys.J.663:1285-1290,2007

Astronomy and Astrophysics

Astrophysics

ApJ, in press

Scientific paper

10.1086/518767

We report Spitzer Space Telescope photometry of eleven externally-polluted white dwarfs. Of the nine stars for which we have IRAC photometry, we find that GD 40, GD 133 and PG 1015+161 each has an infrared excess that can be understood as arising from a flat, opaque, dusty disk. GD 56 also has an infrared excess characteristic of circumstellar dust, but a flat-disk model cannot reproduce the data unless there are grains as warm as 1700 K and perhaps not even then. Our data support the previous suggestion that the metals in the atmosphere of GD 40 are the result of accretion of a tidally-disrupted asteroid with a chondritic composition.

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