Mathematics – Logic
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50832s&link_type=abstract
Spitzer Proposal ID #50832
Mathematics
Logic
Scientific paper
Dusty disks around hot (Teff>70,000 K) white dwarfs are an exciting new phenomenon discovered by Spitzer. It started with the serendipitous discovery of an infrared excess around the central star of the Helix Nebule (Sueet al. 2007). Several possible origins have been proposed to explain the dust continuum observed from the hot white dwarf (~110,000 K). The extreme radiation environment from the hot white dwarf and lack of mineralogical features suggest that the dust detected by Spitzer is not remnant from the star's post-main-sequence, but, instead is a newly identified kind of debris disk composed of grains freshly produced by collisions of surviving, dynamically perturbed parent bodies. Up to date, there are 8 additional hot white drarf candidates that show 24 micron excesses above their expected photospheres. Here we request to observe one of the candidates, WD0950+139 with IRS, to verify the dust continuum origin and provide better constraints on the excess emission. Combining all the dust disks around white dwarfs, Spitzer observations will provide us with enough examples to use them as a new tool to understand the effects of the late stage of stellar evolution on planetary systems.
Bond Howard
Chu Y.-H. Y.-H.
Jura Mike
Liebert James
Rieke George
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