Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50560w&link_type=abstract
Spitzer Proposal ID #50560
Other
Scientific paper
The discovery of water and OH line emission from the cores of Class 0 protostars is one of the most spectacular recent results from Spitzer, and opens one of the longest-sought regimes of star formation to detailed study: protostellar envelope infall, arrival of water (and other molecules) in the planet-forming regions of protoplanetary systems, and the process by which protoplanetary accretion disks are formed. With Spitzer-IRS we can detect such emission in substantial samples of protostars. We propose here to conduct such a survey, on a fiducial sample of 123 face-on Class 0 and Class I protostars in star-forming clouds lying 140-420 pc from the Solar system, with a 5-sigma disk-accretion-rate sensitivity of 2 - 8 E-6 solar masses per year. Detection of water and OH emission from this statistically-complete sample will enable a physical study of the evolution of infall, envelope-disk accretion, and the physical state of protoplanetary disks, through the era of protostellar-envelope settling and dissipation, that would be of fundamental importance in the study of star formation. In a complementary GTO proposal we will cover a much smaller sample of the highest accretion-rate protostars - seven of the eight objects in Orion A in which we have already detected water emission at low spectral resolution - in an exploration of the faintest features of OH, water, and its rare isotopologues.
Allen Lori
Bergin Ted
Calvet Nuria
Forrest Bill
Furlan Elise
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