Spectroscopy of protostellar, protoplanetary and debris disks

Details Spectroscopy of protostellar, protoplanetary and debris disks Spectroscopy of protostellar, protoplanetary and debris disks

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop....2h&link_type=abstract

Spitzer Proposal ID #2

Physics

Scientific paper

SIRTF, and the IRS in particular, is sensitive to the crucial region for protostellar disk accretion, jet collimation and planetary formation, between a few hundredths and a few tens of AU from the central objects. We will exploit this feature of SIRTF-IRS in an exploration the evolution of circumstellar disks, from star birth, through the epoch of the clearing of the terrestrial-planet region and the formation of planets, and toward the end of stellar main-sequence lives. For this purpose we have selected a sample of some 600 objects, in nearby regions of current star formation, in open clusters of well-determined, intermediate age (3-100 Myr), and in lists of main-sequence stars with infrared excesses. Along with the range of ages we have taken care to cover variation in disk orientation, stellar multiplicity, and cluster richness, and have opted to cover relatively uniformly the stellar mass function down to (slightly past) the hydrogen-burning limit. We will observe each object in this sample over the whole IRS spectral range (5-40 microns). The low-resolution spectrographs will be used except for the brightest ~25% of the sample; for these latter objects the IRS high-resolution modules will be used instead of the Long Lo spectrograph. Among the spectral features we will see will be short-wavelength continuum "dropouts" due to inner-disk clearing; signatures of crystalline solids, developing in strength as dust grains are processed in the disk; and molecular, atomic and ionic lines from accretion shocks, jets, and outflow shocks.

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