Disks Around Brown Dwarfs and Low Mass Stars in the Orion Molecular Clouds 2 and 3

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The Orion Molecular Clouds 2 and 3 (OMC 2/3) region is a very active region of ongoing star formation. Submillimeter surveys have found twenty-one protostellar cores in OMC 2/3 (Chini et al. 1997); however it has not been studied as extensively and to similar depth in the infrared as the neighboring Orion Nebula Cluster. Deep near-IR, visible and now Spitzer observations of OMC 2/3 have been obtained and analyzed to identify PMS stars and brown dwarfs. Spectroscopic follow-up has confirmed as many as 17 bona fide brown dwarfs in this region. Circumstellar disks are identified in many of these young objects through infrared excess emission. Spitzer photometry is used to detect mid-infrared excess emission in a dozen OMC 2/3 brown dwarfs, confirming that they exhibit circumstellar disks. Using the ground-based near-IR and Spitzer data, the population of protostars and young stars with disks is identified, and the number and spatial distribution of young stellar objects is presented. By combining this data with the near-IR variabiliity study of Carpenter et al. (2001), a circumstellar disk fraction is determined.

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