Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50596r&link_type=abstract
Spitzer Proposal ID #50596
Computer Science
Scientific paper
We propose to obtain multi-epoch IRAC mapping and IRS spectroscopy of a number of variable young stellar objects (YSOs) in order to constrain the time dependence of their mid-infrared emission. Preliminary Spitzer results indicate a surprising degree of variability in the majority of YSOs surveyed to date. The observed variations exhibit a wide range of timescales (hours to years) and amplitudes (10-100%), and some show completely unexpected wavelength dependences. The variable objects span a range of evolutionary states, from embedded protostars with infalling envelopes to T Tauri stars with evolved circumstellar disks. Some of the strongest variables appear to be associated with disks whose structure may be highly modified by the presence of companions and ongoing planet formation. With high-cadence IRAC imaging of a young cluster, we will examine changes in the structure and accretion activity of the innermost regions of disks around both protostars and accreting T Tauri stars. High-cadence IRS spectroscopy of some of the most striking variable YSOs will help to isolate and characterize the source(s) of the variability. These data will provide an essential tool for understanding the dynamic processes involved in protostellar collapse, accretion, and planet formation.
Allen Lori
Balog Zoltan
Calvet Nuria
D'Alessio Paola
Espaillat Catherine
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