----- Submission 1 (Tue May 10 12:17:05 GMT 2005) ----- Assigned ID: 95 ----- Submission 1 (Thu Jan 20 20:46:17 GMT 2005) ----- Phase I Proposal 95 (astrom_bin_LT) successfully submitted. We propose to obtain high angular resolution ACS images of five binary L and T dwarfs in order to determine their orbital parameters and dynamical masses, and directly constrain the evolutionary models of ultracool and substellar objects. The binaries have estimated periods ranging between 5 and 14 years. All of them have already been resolved at least twice (sometimes more) using HST, providing first and second epochs measurements. We propose to obtain two more ACS imaging observations separated by 9 to 12 months during cycle 14. The expected period coverage should therefore range between 35% and 117%, allowing us to compute precise orbital parameters and masses. Our sample is large enough and covers a sufficiently wide range of spectral types (from L3 to T5.5) to allow us to obtain strong constraints the evolutionnary models.

We aim at getting 2 new epoch observations of our targets (binaries) in order to monitor the orbital motion of the companion. Observational strategy: each exposure will be split in a 4 point box dither pattern in order to optimize cosmic ray and bad pixel rejection and improve the PSF quality. Each 25 seconds subexposure of the dither pattern will be split in 4 CRSPLIT exposures in order to minimize the number of CR events and optimize further CR rejection. The total integration time for each visit will be 100 seconds. COOL STARS 12 false 0.0 false false false false false SUPPORTED STAR BROWN DWARF This object was generated by the targetselector and retrieved from the 2MASS database. J=14.6 J2000 03 57 26.9000 -44 17 30.00 J2000 STAR BROWN DWARF This object was generated by the targetselector and retrieved from the 2MASS database. J=15.625 J2000 09 20 12.2000 +35 17 42.97 J2000 STAR BROWN DWARF This object was generated by the targetselector and retrieved from the 2MASS database. 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