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We present a detailed examination of the brown dwarf multiples 2MASSJ08503593+1057156 and 2MASS J17281150+3948593, both suspected of harboringcomponents that straddle the L dwarf/T dwarf transition. Resolved photometryfrom Hubble Space Telescope/NICMOS show opposite trends in the relative colorsof the components, with the secondary of 2MASS J0850+1057 being redder than itsprimary, while that of 2MASS J1728+3948 is bluer. We determine near-infraredcomponent types by matching combined-light, near-infrared spectral data tobinary templates, with component spectra scaled to resolved NICMOS and Kpphotometry. Combinations of L7 + L6 for 2MASS J0850+1057 and L5 + L6.5 for2MASS J1728+3948 are inferred. Remarkably, the primary of 2MASS J0850+1057appears to have a later-type classification compared to its secondary, despitebeing 0.8-1.2 mag brighter in the near-infrared, while the primary of 2MASSJ1728+3948 is unusually early for its combined-light optical classification.Comparison to absolute magnitude/spectral type trends also distinguishes thesecomponents, with 2MASS J0850+1057A being ~1 mag brighter and 2MASS J1728+3948A~0.5 mag fainter than equivalently-classified field counterparts. We deducethat thick condensate clouds are likely responsible for the unusual propertiesof 2MASS J1728+3948A, while 2MASS J0850+1057A is either an inflated young browndwarf or a tight unresolved binary, making it potentially part of a wide,low-mass, hierarchical quintuple system.

Hubble Space Telescope Imaging and Spectral Analysis of Two Brown Dwarf Binaries at the L Dwarf/T Dwarf Transition