Computer Science
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20691b&link_type=abstract
Spitzer Proposal ID #20691
Computer Science
Scientific paper
Observations have revealed that dust undergoes a profound processing in protoplanetary disks around young stars on a time scale of ~1 to 20 Myr. Dust grains condense, are chemically altered, and/or crystalize, and grow through coagulation. Eventually, these processes may culminate in the formation of a planetary system. At the same time, the disk evolves on a global scale. The disk geometry may change from flaring to a more flattened structure. The disk may also develop gaps and eventually will dissipate.These processes will be heavily influenced by the characteristics of the star (or stars) and its interaction with the disk. The importance of these different factors is presently not well known. We propose an infra-red spectroscopy and photometry study of a complete and unbiased sample of all young stellar objects in 4 associations, with the aim of characterizing the dust in the circumstellar disks.The observations will directly provide us with the composition, size and amount of dust present as well as the geometry (eg., flaring), mass, and gaps in the global structure of the disk. Because each association is coeval, the effects of time on the dust and the disks can be separated from those due to the variation in stellar parameters. Intercomparison of the properties of the dust and the disks derived for the different associations provides then a handle on the temporal aspects of the dust and disk evolution around young stellar objects. This proposal is very complementary to the legacy and GTO observations which focus on the brightest young stellar objects.
Apai Daniel
Bouwman Jeroen
Chen Christine
Feigelson Eric
Grady Carol
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