Wide Ultracool Binaries and Brown Dwarfs in a Cross-Match of the Two Micron All Sky Survey and the Sloan Digital Sky Survey

Astronomy and Astrophysics – Astronomy

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Scientific paper

We have searched for red, high proper-motion objects in a cross-match of the Sloan Digital Sky Survey and Two Micron All Sky Survey, with the goal of identifying wide ultracool binaries and previously missed brown dwarfs. We have found 21 binary candidates with at least one very low mass or brown dwarf component, and over 50 new L and T dwarf candidates. We present follow-up spectroscopy, obtained with SpeX at IRTF, of confirmed binaries and T dwarfs. Among these is G 203-50B, a wide, unusually blue L5 companion to a nearby low-mass star, and the widest ultracool binary yet discovered with a separation > 6000 AU.

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