NOAO >   Observing Info >   Approved Programs >   2013A-0233

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Proposal Information for 2013A-0233


PI: Jonathan Gagne, Universite de Montreal, jonathan.gagne@astro.umontreal.ca
Address: Physics Department, 2900, boul. Edouard-Montpetit, Montreal, Quebec H3T 1J4, Canada

CoI: Rene Doyon, Universite de Montreal
CoI: David Lafreniere, Universite de Montreal
CoI: Lison Malo, Universite de Montreal
CoI: Etienne Artigau, Universite de Montreal

Title: Spectroscopic confirmation of very low-mass stars and brown dwarf candidates in nearby, young moving groups

Abstract: Extending the current census of young nearby associations toward lower masses is essential to study the IMF at a few Myr down to substellar masses and understand the evolution and atmospheres of young brown dwarfs. Based on the proper motions and photometric properties of a large sample of red stars derived from a correlation of 2MASS with WISE, we identified 190 highly probable late-type (> M5) members of the Beta Pictoris and TW Hydrae moving groups and Tucana-Horologium association, as well as 6 other young associations. As the youth (i.e. low surface gravity) of such objects should be apparent from the shape of their near-infrared spectrum as well as some atomic lines (e.g. KI doublets), we propose to use OSIRIS to obtain near-infrared spectra and confirm the membership of 75 candidates only visible in the southern hemisphere. This program will unveil a significant population of young brown dwarfs, down to the planetary mass regime, in close-by young moving groups, providing high-quality template spectra as benchmarks for evolutionary models.


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NOAO >   Observing Info >   Approved Programs >   2013A-0233

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