Assigned ID: 964 ----- Attempting Submission 1 (Sat Feb 25 00:09:39 GMT 2012) ----- HST Phase I Proposal 964 (phase1-AR-sub1.pdf.apt) successfully submitted. ----- Attempting Submission 2 (Sat Feb 25 00:48:58 GMT 2012) ----- A recently invented data reduction technique called Kernel-phase offers the means to probe for faint companions around nearby stars and brown dwarfs, down to and even within the formal diffraction limit of HST, with milli-arcsecond astrometric precision: a regime refered to as super-resolution. We propose to revisit a uniform HST/NIC1 survey of ultracool dwarfs to probe for previously undetected companions at angular separations unaccessible to other techniques. In addition to potential new detections, this analysis provides improved relative astrometry of all known binaries and produces contrast detection limits that translate into strong constraints on the statistical properties of ultracool dwarf binaries: binary fraction, mass ratio and orbital separation distribution. COOL STARS 12 Medium false 0.0 0.0 false false false false SUPPORTED