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We used HST/WFC3 observations of a sample of 26 nearby ($\le$20 pc) mid tolate T dwarfs to search for cooler companions and measure the multiplicitystatistics of brown dwarfs. Tightly-separated companions were searched forusing a double-PSF fitting algorithm. We also compared our detection limitsbased on simulations to other prior T5+ brown dwarf binary programs.  No new wide or tight companions were identified, which is consistent with thenumber of known T5+ binary systems and the resolution limits of WFC3. We useour results to add new constraints to the binary fraction of T-type browndwarfs. Modeling selection effects and adopting previously derived separationand mass ratio distributions, we find an upper limit total binary fraction of<16% and <25% assuming power law and flat mass ratio distributionsrespectively, which are consistent with previous results. We also characterizea handful of targets around the L/T transition.

Constraints on the binary Properties of mid to late T dwarfs from Hubble Space Telescope WFC3 Observations