8-12 juin, 2014

Résumé

Search and Caracterization of Wide Binary Systems With a Very Low-mass Component

Frédérique Baron (Université de Montréal)

David Lafrenière (Université de Montréal) Étienne Artigau (Université de Montréal) René Doyon (Université de Montréal) Jonathan Gagné (Université de Montréal)

We report the finding of 14 new binary systems containing a late-M or L dwarf companion with a separation of larger than 250 AU. Those systems were part of a bigger sample that has been built by analyzing imaging data and by a statistical calculation. An astrometric follow-up has been made on all the targets with SIMON and/or CPAPIR and the positions extracted from these images has been compared to the one available from the 2MASS, WISE and SDSS catalogs to calculate the proper motions. A spectroscopic follow-up has also been made on with GMOS or GNIRS to determine the spectral types of our candidates, which has been used to estimate the distance. Lastly, the probability of random alignment has been estimated.

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