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The multiplicity properties of brown dwarfs are critical empiricalconstraints for formation theories, while multiples themselves provide uniqueopportunities to test evolutionary and atmospheric models and examine empiricaltrends. Studies using high-resolution imaging can not only uncover faintcompanions, but they can also be used to determine dynamical masses throughlong-term monitoring of binary systems. We have begun a search for the coolestbrown dwarfs using preliminary processing of data from the Wide-field InfraredSurvey Explorer (WISE) and have confirmed many of the candidates as late-type Tdwarfs. In order to search for companions to these objects, we are conductingobservations using the Laser Guide Star Adaptive Optics system on Keck II. Herewe present the first results of that search, including a T5 binary with nearlyequal mass components and a faint companion to a T8.5 dwarf with an estimatedspectral type of T9.

WISE Brown Dwarf Binaries: The Discovery of a T5+T5 and a T8.5+T9 System