Computer Science
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40109b&link_type=abstract
Spitzer Proposal ID #40109
Computer Science
Scientific paper
One of the most dramatic Spitzer discoveries to date has been the extreme level of zodiacal emission around the nearby (12.6 pc) K0V star HD 69830. The dust cloud around HD69830 has more than 1,400 times the emission of our own zodiacal cloud and shows a plethora of solid state features attributable to small, hot, crystalline silicate grains located within 0.5 AU of the parent star. Interest in this cloud and its link to the evolution of planetary systems was greatly heightened by the discovery of three Neptune-mass planets orbiting within 0.5 AU of the star. The HD 69830 system promises to be the premier laboratory for the study of the interaction been a debris disk and a planetary system. Closer examination of the spectrum reveals silicates and a smattering of sulfides and carbonates, and some water ice. The dust appears to be consistent with ejecta from the destruction of a 30 km asteroid of the S-(or possibly P/D-) type. We request 24.9 hours of Spitzer time to make high signal- to-noise, low- and high-spectral resolution observations of the dust disk and to improve constraints on the amount of cold Kuiper Belt emission at 70 um. This definitive dataset would allow us to improve substantially our modeling of the composition and spatial distribution of the emitting dust which will in turn help to distinguish between an asteroidal and cometary origin of the material. This request includes three repeats of the spectral observations designed to search for small variations that might be expected from a dust cloud evolving with a dynamical time of less than 1 year. Our team has extensive experience with Spitzer data analysis for both IRS and MIPS, detailed compositional modeling, and dynamical modeling of complex planet-disk interactions. Only Spitzer can provide a complete spectrum of the debris disk excess region and hold out the unique prospect of finding evolution in the disk structure and/or composition on the dynamical timescale of the system.
Beichman Charles
Bryden Geoff
Lisse Carey
Wyatt Mark
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