NOAO >   Observing Info >   Approved Programs >   2009B-0531

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Proposal Information for 2009B-0531


PI: Cesar Briceno, Centro de Investigaciones de Astronomia (CIDA), briceno@cida.ve
Address: CIDA, Av. Alberto Carnevali - via La Hechicera, Merida, Merida 5101, Venezuela

CoI: Juan Jose Downes, Centro de Investigaciones de Astronomia (CIDA)
CoI: Jesus Hernandez, Centro de Investigaciones de Astronomia (CIDA)

Title: A Deep Synoptic JHK Survey for Brown Dwarfs in Orion OB1

Abstract: We propose a deep, large scale JHK photometric survey, and matching J-band synoptic survey of ~ 13> deg^2 in the nearby Orion OB1 association, spanning two wide regions in the age range ~ 5-10 Myr. Our inmediate objective is to detect a large sample of young brown dwarfs down to 20M_J, in order to derive for the first time the substellar Initial Mass Function in this wide region, study the spatial distribution of stars and brown dwarfs as a fuction of mass, characterize near-IR variability, determine rotation periods and find very-low mass/brown dwarf eclipsing binaries. Our survey will: 1) produce the first numerous sample of 5-10 Myr old BDs down to 20 M_J, essential to understand the origin and early evolution of these objects, providing a direct comparison of the IMF and spatial distribution of BDs and very low-mass stars with predictions from models of molecular cloud fragmentation. 2) Probe the evolution of primordial disks around the lowest mass BDs. 3) Offer unique insight into surface activity in the substellar domain, and how it evolves during the first 10 Myr. This dataset will also be key to address the early evolution of angular momentum in BDs and its dependence with circumstellar disks and the environmental properties of each region. Finally, BD eclipsing binaries, if found, provide empirical masses and radii, which are a test for evolutionary models.


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



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