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