Measuring YSO inner accretion disk sizes, structure and dynamics with staring mode observations of 14 YSOs in Rho Ophiuchus

Details Measuring YSO inner accretion disk sizes, structure and dynamics with staring mode observations of 14 YSOs in Rho Ophiuchus Measuring YSO inner accretion disk sizes, structure and dynamics with staring mode observations of 14 YSOs in Rho Ophiuchus

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60109p&link_type=abstract

Spitzer Proposal ID #60109

Computer Science

Scientific paper

Variability is almost a defining characteristic of young stellar objects (YSOs). We propose a program to monitor YSOs with IRAC channel 2 in staring mode for 3 sets of 8 hours. This proposal is complementary to our Exploration Science Spitzer program YSOVAR, which measures variability on timescales greater than 4 hours. With the proposed observations, we will probe disk accretion dynamics on timescales from ~1 minute to 4 hours. Furthermore, we will carry out a novel application of the AGN reverberation mapping technique to YSOs to measure inner disk edge sizes. Combined with ground-based contemporaneous near-IR monitoring, we will be able to measure light travel time delays as short as 25 seconds from the reprocessed dust emission (~0.05 AU). We have constructed a model that confirms the feasibility of measuring these short time-lags, and it requires high-precision mid-infrared photometry that only Spitzer can provide. We have selected a field of 8 nearby, bright Class I and II YSOs in Rho Ophiuchus that contains known near-infrared variables to carry out this pilot program.

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