Six White Dwarfs with Circumstellar Silicates

Details Six White Dwarfs with Circumstellar Silicates Six White Dwarfs with Circumstellar Silicates

2008-11-11

arxiv.org/abs/0811.1740v1

Astronomy and Astrophysics

Astrophysics

21 pages, 7 figures, AJ, in press

Scientific paper

10.1088/0004-6256/137/2/3191

Spitzer Space Telescope spectra reveal 10 micron silicate emission from circumstellar dust orbiting six externally-polluted white dwarfs. Micron-size glasses with an olivine stoichiometry can account for the distinctively broad wings that extend to 12 microns; these particles likely are produced by tidal-disruption of asteroids. The absence of infrared PAH features is consistent with a scenario where extrasolar rocky planets are assembled from carbon-poor solids.

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