| Abstract: | WISE has uncovered brown dwarfs with effective temperatures ~400K, bringing us ever closer to finding objects with Jupiter-like atmospheres (T=128K). Being so cold, these brown dwarfs are intrinsically faint and necessarily close, making them the best targets in which to search for faint companions. Because the components in a binary are coeval and have the same metallicity, binaries provide critical constraints when comparing brown dwarf observations to model atmosphere results. We have been using the Hubble Space Telescope and W.M. Keck Telescope to obtain high resolution images of WISE-discovered brown dwarfs with spectral types T8 and later (T<700K) in order to search for fainter and colder companions. During this talk, I will discuss the HST and Keck observing programs and provide some of the preliminary results from the survey. |