PI: Davy Kirkpatrick, Infrared Processing and Analysis Center, firstname.lastname@example.org
Address: California Institute of Technology, MS 100-22, Pasadena, CA 91125, USA
CoI: Patrick Lowrance, SIRTF Science Center
CoI: Adam Burrows, University of Arizona
CoI: Adam Burgasser, University of California, Los Angeles
Title: Gravity Effects in Brown Dwarf Spectra
Abstract: We wish to continue our investigation of gravity effects in brown dwarf spectra. The ability to estimate gravity from spectral features alone will provide an independent check of age for brown dwarfs whose cluster membership is only assumed. More importantly perhaps, it will provide diagnostics with which to distinguish young brown dwarfs in the field independent of kinematics or companionship. In this proposal we would like to probe a little deeper into these possible spectral diagnostics. Namely, we would like to (1) determine the range of variation in spectral features for the youngest brown dwarfs in the sample, and (2) test the validity of ``free-floating planets'' -- those purportedly youthful, low-gravity M and L dwarfs -- being uncovered in clusters like Sigma Orionis.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360