PI: Poshih Chiang, National Central University, Taiwan, email@example.com
Address: Graduate Institute of Astronomy, 300 Jhongda Rd., Jhongli 32001, Taiwan
CoI: Wen-Ping Chen, National Central University, Taiwan
CoI: Michael Liu, University of Hawaii
CoI: Eugene Magnier, University of Hawaii
Title: Young planetary objects in the \rho Ophiuchi dark cloud
Abstract: We propose to acquire GNIRS near-infrared low-dispersion spectra to confirm the coolest brown dwarf candidates we have identified in the \rho Ophiuchi cloud. These candidates have been selected by methane imaging with possible absorption features at both 1.6 (mu) m and 3.3 (mu) m, i.e., with criteria more stringent than previous studies by infrared colors alone. Some of these candidates share the same proper motions with known young star members in the cloud. At a distance of 130 pc and an age of 1 Myr, these candidates, once confirmed, will be the lowest mass (< 4M_J ) population found so far in the \rho Ophiuchi cloud, and would form a valuable substellar sample to investigate their formation mechanism and relation with molecular materials and other young stellar populations in the cloud.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360