NOAO >   Observing Info >   Approved Programs >   2012B-0280

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Proposal Information for 2012B-0280


PI: Frederick M. Walter, Stony Brook University, fwalter@mail.astro.sunysb.edu
Address: Physics Department, Z=3800, Stony Brook, NY 11794-3800, USA

CoI: William Sherry, Eureka Scientific
CoI: Serena Kim, University of Arizona

Title: Substellar Mass Objects in Orion OB1b

Abstract: OB associations are ideal sites for probing the formation of low mass objects. There has been little systematic study of the very lowest mass objects in Orion OB1, the largest nearby OB association (exclusive of the Orion Nebula Cluster). We have completed a wide-field near-IR (JHK) survey of ~18 deg^2 in the Orion OB1a and OB1b associations using the CPAPIR camera on the SMARTS/CTIO 1.5m telescope. This survey reaches to K~17, with a completness limit about 1.5 mag deeper than the 2MASS catalog. We have deep optical (BVRI) followups and deeper JHK images in selected areas. We find thousands of faint objects with the colors expected of substellar mass objects at association ages. We need spectra of a representative sample to confirm the fraction of photometric candidates are indeed young substellar mass objects.


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