Physics
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop50532l&link_type=abstract
Spitzer Proposal ID #50532
Physics
Scientific paper
Understanding the nature of deeply embedded solar mass protostars is one of the interesting challenges in the study or low-mass star formation. Highly energetic processes, such as strong irradiation and outflows, are likely directly related to the ongoing accretion onto the central growing protostar. UV radiation is known to play a role in the envelopes around more massive young stellar objects (YSOs) and in the physics and chemistry of disks around more evolved pre-main sequence stars. Because the UV radiation does not penetrate far through the envelope, very little is known about the impact of UV radiation in these early stages of low-mass YSOs and whether they have associated photon-dominated regions (PDRs). Mid-infrared Spitzer observations of atomic fine-structure lines, molecular hydrogen and water at both small and large spatial scales can be used to place direct constraints on the processes associated with accretion, PDR and shock excitation. We here propose to obtain deep IRS high resolution observations of a sample of seven embedded protostars which show either extended PDR type emission lines or water emission in existing lower S/N IRS spectra. These observations will address whether the extended line emission is uniquely related to PDRs and if so, whether the origin of the UV radiation producing the PDR has its origin in the accretion from the central star - or whether it is related to outflow driven shocks.
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