Computer Science
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3347p&link_type=abstract
Spitzer Proposal ID #3347
Computer Science
Scientific paper
The immediate goal of this proposal is to investigate evolution of debris disks as a function of stellar age by surveying samples of A stars in young clusters to identify far-infrared excesses. Our long-term goal is to explore the timescales over which debris disks may be cleared out by the formation of planets and by orbital migration, and how these processes mesh with the evolution of the gas, as sampled at optical and UV wavelengths. We are investigating these processes by examining late B and early A dwarfs in clusters ranging in age from a few million years up to 100 million years. Spitzer observations with MIPS are key to detecting the presence of debris disks through signature emission in the 25-160 micron regime. Infrared flux measurements will enable us not only to detect debris disks and determine the frequency of such disks as a function of stellar age, but also to begin to characterize the properties of debris disks as a function of age. Data on the relative frequency of debris disks as a function of age may constrain the time scale for formation and migration of giant planets in young solar systems, and may help to distinguish between two competing models of giant planet formation (core accretion vs. disk instabilities).
Grady Carol
Jacobson Heather
Pilachowski Catherine
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