Computer Science
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..241c&link_type=abstract
Spitzer Proposal ID #241
Computer Science
Scientific paper
Planets, asteroids, and comets are believed to form in circumstellar disks of ga s and dust with ages <100 Myr. Although these objects are not detected directly in disks, their presence can be inferred from observations of spatial structure (e.g. gaps, central clearings, and warps) and transient gas phase molecules and atoms. I plan to carry out a multi-wavelength study of 5 - 20 Myr old F-, G-, and K-type stars in the nearest OB Association, Scorpius-Centaurus, to search for these signposts of Solar System body formation and to study the evolution of solids from instellar dust grains to parent bodies. I am leading an effort by Spitzer GTO Mike Jura to search for dusty disks around ~120 solar-like stars in Sco-Cen using MIPS at 24 micron and 70 micron. Our first observations from this program have discoved more than a dozen objects with fractional infrared luminosities as high as 1.0e-3 (Chen et al. 2005). Follow-up Spitzer IRS data, obtained in collaboration with the IRS Disks team, will be combined with Spitzer MIPS SED mode observations to determine the composition of dust grains in these systems. High resolution ground-based, mid-infrared imaging in N- and Q-band will directly constrain the location of warm dust grains and, when compared with high resolution scattered light imaging, may help determine the grain albedo and whether snow lines exist in these systems. High resolution visual spectroscopy will allow us to search for circumstellar gas, which may either be remnant gas, left over from the formation of the system, or secondary-gas, generated by the sublimation of infalling cometesimals.
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