Other
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50633h&link_type=abstract
Spitzer Proposal ID #50633
Other
Scientific paper
The discovery of water and OH line emission from the embedded disks 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 have so far detected emission in eight protostars (in IRS SL-LL observations) in addition to the original example, NGC 1333 - IRAS 4B. These objects are likely to represent the upper extreme of protostellar infall rate and disk water and OH line luminosity. Here we propose deep high-resolution IRS followup high-resolution spectroscopy on seven of these objects, to enable a particularly detailed study of the physical and oxygen-chemical state in paradigms of the very youngest protoplanetary disks, exploiting even relatively weak features of OH, water, and its rare isotopologues. This program will consume 10.3 hours of Spitzer-IRS GTO time, provided by IRS PI and co-investigator Jim Houck. In a complementary GO proposal (Watson et al.) we would conduct a survey of a complete sample of Class 0 and Class I protostars similar to those proposed here(i.e. viewed face-on), but covering the full range of properties of envelope-bearing protostars: it is chosen to span the range of mass, luminosity and age of protostars with high statistical significance, 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 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.
Allen Lori
Bergin Ted
Calvet Nuria
Forrest Bill
Furlan Elise
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