Mid-Infrared Variability of Orion Protostars

Details Mid-Infrared Variability of Orion Protostars Mid-Infrared Variability of Orion Protostars

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943705t&link_type=abstract

American Astronomical Society, AAS Meeting #219, #437.05

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results for Class I protostars in Orion based on synoptic data from the YSO variability (YSOVAR) program. The mid-infrared data include Spitzer data at 3.6 and 4.5 microns wavelength representing high and low cadence measurements at hour, day, and year time scales in the Orion star-forming region. The mid-infrared data are sensitive to the inner regions of disks and thus provide information on inner disk structure and variable accretion rates. Protostars show little variation over one day but exhibit significant variations over several days. The typical magnitude variation is 0.3 mag, small enough to suggest that hot spot plus disk models developed for class II sources may also apply to protostars. However about 10 percent of Orion protostars show variations greater than 0.6 magnitudes. We discuss several models that can produce large magnitude variations in protostars.

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