We used HST/WFC3 observations of a sample of 26 nearby (≤20 pc) mid to late T dwarfs to search for cooler companions and measure the multiplicity statistics of brown dwarfs. Tightly-separated companions were searched for using a double-PSF fitting algorithm. We also compared our detection limits based on simulations to other prior T5+ brown dwarf binary programs. No new wide or tight companions were identified, which is consistent with the number of known T5+ binary systems and the resolution limits of WFC3. We use our results to add new constraints to the binary fraction of T-type brown dwarfs. Modeling selection effects and adopting previously derived separation and mass ratio distributions, we find an upper limit total binary fraction of <16% and <25% assuming power law and flat mass ratio distributions respectively, which are consistent with previous results. We also characterize a handful of targets around the L/T transition.
@article{arxiv.1408.4259,
title = {Constraints on the binary Properties of mid to late T dwarfs from Hubble Space Telescope WFC3 Observations},
author = {M. Aberasturi and A. J. Burgasser and A. Mora and E. Solano and E. L. Martín and I. N. Reid and D. Looper},
journal= {arXiv preprint arXiv:1408.4259},
year = {2016}
}