Disk Census of Nearby Young Stellar Groups

Details Disk Census of Nearby Young Stellar Groups Disk Census of Nearby Young Stellar Groups

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3600s&link_type=abstract

Spitzer Proposal ID #3600

Physics

Scientific paper

MIPS 24 and 70 micron observations are proposed to detect infrared excess emission at ~50 members of nearby, young stellar groups. Ages of these stars are well determined and the age range (8-50 Myr) overlaps with important epochs of our own Solar System formation. Using a high fidelity spectral energy distribution fitting technique, photospheric fluxes will be estimated with uncertainty as small as ~10mJy. Sensitive Spitzer observations with accurate photospheric flux estimates will allow us to assess IR excesses as small as L(IR)/L(star)~10^-5 for late-type stars. For early-type stars, we can detect excess emission as small as 10^-6. These observations will provide a wide range of dust excess over the interval 8-50 Myr for stars with spectral types from B to M. Together with data from Spitzer legacy and GTO programs, this proposed study can significantly improve our understanding of the diversity and frequency of dusty disk occurrence among young stars and provide important information on formation and early evolution of planetary systems.

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