NOAO >   Observing Info >   Approved Programs >   2009A-0181

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Proposal Information for 2009A-0181


PI: Ben Zuckerman, UCLA, ben@astro.ucla.edu
Address: Physics Department, 430 Portola Plaza Box 951547, Los Angeles, CA 90095, USA

CoI: Carl Melis, UCLA
CoI: Inseok Song, University of Georgia

Title: Hunting the Coolest Substellar Dwarfs

Abstract: The very few lowest mass substellar objects discovered in previous imaging surveys are found to have large semi-major axes, typically hundreds of AU. We show that at such large separations and toward old stars one has the best chance to detect the coolest dwarfs, with effective temperatures of <=500 K (the so-called ``Y dwarfs''). Effective temperatures of 500 K represent a region of temperature space that has yet to be probed. As such, the discovery of such cool objects will illuminate their physics and chemistry and will provide observational data to test planetary models. To discover one or more Y dwarfs, we are proposing to survey with ISPI white dwarfs with ages >2 Gyr that lie within 25 pc of Earth.


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 >   2009A-0181

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