NOAO >   Observing Info >   Approved Programs >   2009B-0472

Small NOAO Logo

Proposal Information for 2009B-0472


PI: William Sherry, NSO/NOAO, wsherry@noao.edu
Address: 950 N. Cherry Ave., Tucson, AZ 85719, USA

CoI: Sean Brittain, Clemson
CoI: Frederick Walter, Stony Brook
CoI: Jinyoung Serena Kim, Steward Observatory

Title: A Census of Brown Dwarfs and Giant Planets in the Orion OB1b Sub-- Association

Abstract: Stars form through a series of complex dynamic process, most of which start and finish behind an opaque shroud of dust. In active star forming regions, we see the final phase of construction. We see the fully assembled, final products of star formation only in slightly older, fossil star forming regions where star formation is complete and the obscuring gas and dust are gone. These are the places to measure a truly initial mass function (\bf IMF). They are also the best place to detect brown dwarfs and free-floating giant planets which cool and fade rapidly as they age. We propose to complete our deep optical and near infra-red broad band survey of 7 square degrees of the Orion OB1b sub-association down to ~0.01M_\odot. We will use this survey to statistically identify the brown dwarf and free-floating giant planet population. Our previous work on the low-mass population of Orion OB1b demonstrates that there is a rich pre-main sequence locus which can be clearly detected on the color-magnitude diagram. These observations will allow us to measure the IMF down to 10M_J. We will map the spatial distribution of low-mass stars and brown dwarfs in the association and estimate the degree of mass segregation by comparing the spatial distribution of brown dwarfs to the low-mass stars.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2009B-0472

noaoprop-help@noao.edu

Small NOAO Logo