NOAO >   Observing Info >   Approved Programs >   2013B-0495

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Proposal Information for 2013B-0495


PI: Lison Malo, Universite de Montreal, malo@astro.umontreal.ca
Address: Departement de Physique, C.P. 6128, Succ. Centre-ville, Montreal, Quebec H3C 3J7, Canada

CoI: Jonathan Gagne, Universite de Montreal
CoI: Rene Doyon, Universite de Montreal
CoI: David Lafreniere, Universite de Montreal
CoI: Etienne Artigau, Universite de Montreal
CoI: Andre-Nicolas Chene, Gemini
CoI: Jackie Faherty, Universidad del Chile
CoI: Loic Albert, Universite de Montreal
CoI: Marie-Eve Naud, Universite de Montreal

Title: Confirmation and characterization of low-mass and brown dwarf candidate members of nearby young associations

Abstract: Young nearby associations provide a crucial sample of stars for studying the local star formation history, investigating the early phases of planet formation, and searching for exoplanets through direct imaging. While new associations have been identified in the last decade, their members are mostly restricted to relatively massive (F,G,K) stars. Through a novel statistical analysis, we have identified 357 highly probable young low-mass and brown dwarfs members of BetaPictoris and ABDoradus moving groups, TWHydrae, Tucana-Horologium, Columba, Carina and Argus associations. A confirmation of their membership and their young age require, however, measurements of their radial velocity, parallax and spectroscopic age indicators. First, we propose to use Phoenix to measure radial velocity for 40 northern candidates. Previous time allocations have already enabled the confirmation of 39 new members. Second, we propose to confirm the kinematic age of 15 candidates by using Chiron to measure several spectroscopic youth indicators, such as CaH, lithium, Halpha and HeI line (accretion) and rotation. Finally, we proposed to continue our trigonometric parallax program, initiated in 2011, to measure precisely the fourth astrometric epoch of 19 candidates. Our program will significantly improve the census of young moving group members.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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