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Burrows, Adam
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article
Spitzer Spots Comets Around A White Dwarf
Abstract
We present new observations of the white dwarf G 29-38 with the Spitzer Space Telescope. We detected a strong silicate emission feature, whose shape can be explained by a mixture of amorphous olivine and a small amount of forsterite. The spectral energy distribution also requires amorphous carbon to explain the hot continuum. The properties of this cloud suggest a relatively recent disruption of a comet or asteroid that has temporarily boosted the dust population around this exceptional star.