Astronomy and Astrophysics – Astrophysics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30054w&link_type=abstract
Spitzer Proposal ID #30054
Astronomy and Astrophysics
Astrophysics
Scientific paper
We propose research designed to increase our understanding of the thermal evolution of ices in the environments of deeply embedded young stellar objects (YSOs) of low to intermediate mass in the local galaxy. This is an important astrophysical goal because the ices are carriers of key chemical elements and compounds from interstellar clouds to protostellar envelopes and protoplanetary disks. It will be accomplished by means of a detailed study of the 15 micron feature of solid carbon dioxide in high-resolution IRS spectra of class 0 and class I YSOs from the Spitzer archive. Carbon dioxide is a ubiquitous constituent of the ices with abundance typically 20-30% relative to water; its 15 micron absorption profile is established as a tracer of the physical and chemical changes that occur when the ices are heated from typical molecular-cloud temperatures to those arising in the warmer envelopes of YSOs. We aim to build upon our previous work, which includes extensive observational programs with both ISO and SST, and NASA-funded studies of laboratory analogs in support of our Spitzer observations. Those observations (GTO program #27; cycle 1 GO program #3303) established the nature and abundance of CO2-bearing ices in cold, quiescent molecular clouds, results that provide ground-truth for comparison with the wealth of YSO spectra now available from the SST archive. A comprehensive study that will help define Spitzer's contribution to our understanding of ices in star formation regions is now warranted. Our prior experience with IRS data reductions and profile modeling, together with the availability of new results from our synergistic studies of laboratory analogs, will ensure that we fully extract the information inherent in these profiles.
Bergin Edwin
Chiar Jean
Cook Amanda
Gerakines Perry
Gibb Erika
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