Ja n 20 07 Infrared Emission from the Dusty Disk Orbiting GD 362 , An Externally - Polluted White Dwarf

We report Spitzer Space Telescope photometry between 3.6 µm and 24 µm and spectroscopy between 5 µm and 15 µm of GD 362, a white dwarf with an effective temperature near 10,000 K that displays a remarkably high concentration of metals in its photosphere and a thermal infrared excess. We approximately reproduce both the infrared continuum and the very strong 10 µm silicate emission feature with a model of an orbiting dusty disk which is flat out to 50 stellar radii and warped between 50 and 70 stellar radii. The relatively small amount of cold material implied by the weak 24 µm flux argues that the disk lies within the Roche radius of the star, and we may be witnessing a system where an asteroidal-size body has been tidally destroyed. If so, determination of the photospheric metal abundances may measure the bulk composition of an extrasolar minor planet.