NOAO >   Observing Info >   Approved Programs >   2014A-0381

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Proposal Information for 2014A-0381


PI: Poshih Chiang, National Central University, pschiang@gmail.com
Address: Graduate Institute of Astronomy, 300 Jhongda Rd., Jhongli 320, Taiwan

CoI: Wen-Ping Chen, National Central University

Title: Population of planetary objects in the \rho Ophiuchi star-forming region

Abstract: We propose to acquire near-infrared low-dispersion spectra with \it FLAMINGOS-2/Gemini-S and \it MOSFIRE/Keck-I as the last step to confirm the coolest brown dwarf candidates that we have identified in the Ophiuchi cloud. T dwarf candidates have been selected not only by methane imaging with possible absorption features at both 1.6 \micron\ and 3.3 \micron, but also by cool temperature indicators of H-[4.5] and K-[4.5], i.e., with selection 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. Late-M/L dwarf candidates have selected by cool temperature indicators, DUSTY 1-Myr isochrone, and proper motions. At a distance of 130 pc and with an age of 1 Myr, these candidates, once confirmed, will be the lowest mass population found so far in a star-forming cloud, and would form a valuable substellar sample to investigate their atmospheres, formation mechanism and relation with other young stellar populations in the cloud.


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NOAO >   Observing Info >   Approved Programs >   2014A-0381

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