Time-Series IRAC Photometry of Protostars in L1641

Details Time-Series IRAC Photometry of Protostars in L1641 Time-Series IRAC Photometry of Protostars in L1641

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sptz.prop80160f&link_type=abstract

Spitzer Proposal ID #80160

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Scientific paper

We propose time-series monitoring with Spitzer/IRAC of a sample of 62 embedded protostars in the Orion molecular cloud Lynds 1641. Photometric variability at 3.6 and 4.5 microns probes the protostellar accretion disk inside of 1 AU, a spatial regime that is otherwise difficult to observe in highly embedded systems. We will discern the role of stellar rotation, disk instabilities, and episodic accretion in producing variable protostellar light curves. The protostars of L1641 are exceptionally well-characterized; we have supporting data on them from ground- and space-based observatories extending from the near-IR to the sub-mm. These data allow us to carefully choose a sample that includes a range of envelope densities and infall rates, environments ranging from small groups to isolation, multiplicity, and viewing angle. Our goal is to understand how these factors, acting on scales of 10 to 5000 AU, influence accretion from the inner disk onto the central star at the youngest, most embedded stages in the formation of low-mass stars. These data from a range of protostellar environments, from isolated to densely grouped, will also serve as an excellent comparison to similar data obtained for protostars in the rich Orion Nebula Cluster by the Spitzer YSOVAR program. With this program we will gain an improved understanding of the evolution of disk accretion during the protostellar phase.

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