Name/Affiliation: Jonathan Gagné (Université de Montréal / Caltech)
Young Brown Dwarfs in Nearby Moving Groups
In this talk, I will first wrap up the principal characteristics and performance of your new BANYAN II Bayesian inference algorithm that estimates the membership probability of low-mass stars and brown dwarfs to nearby, young moving groups, without the need of having radial velocity or parallax measurements. Then, I will present how we used BANYAN II in a cross-correlation of the whole 2MASS and WISE catalogs to identify several hundreds of late-type candidates to moving groups in this way. This will be followed by the presentation of the current status of an extensive follow-up with optical and near-infrared spectroscopy (FIRE, SpeX, GMOS-S, GMOS-N, OSIRIS, MAGELLAN) to find signs of low-gravity (thus youth) in our target sample. These results include new, very compelling young mid-M to early-L brown dwarf candidates to TW Hydrae, Beta Pictoris, Tucana-Horologium, AB Doradus, Columba, Carina and Argus.