17080( 2) - 11-Jul-2022 14:34:13 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17080 Version: 2 Check-in Time: 11-Jul-2022 14:34:13 STScI Edit Number: 0 Title Astrometric search for Planets orbiting the closest Y Dwarf ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Luigi R. Bedin INAF - Osservatorio Astronomico di Padova Y CoI: Prof. Adam J. Burgasser University of California - San Diego N CoI: Prof. Daniel Apai University of Arizona N CoI: Dr. Clemence Fontanive University of Bern N ------------------------------------------------------------------------------------ Abstract Located at 2.2 pc, the ~250K Y2 (sub-)brown dwarf WISE J085510.83-071442.5 is the fourth closest known system to Earth. Studying this object provides unique insights into brown dwarf (and exoplanet) atmospheric properties, thermal evolution, multiplicity, and planet-hosting prospects. We propose to use HST to obtain one the most accurate annual parallax of this - or any - planetary-mass brown dwarf to date, achieving an unprecedented accuracy of 200 micro-arcseconds, and constraining its absolute space motion to equivalent accuracy. More importantly, we will be able to search for faint companions co-moving with the target, either resolved or through astrometric perturbations of its linear motion, the latter probing down to a few Earth masses. HST is the optimal facility for precision astrometric measurement of WISE 0855-0714, as this source is too cool and faint at optical and near-infrared wavelengths to observe with ground-based facilities or Gaia. Our observations will improve current astrometric precision of this source by a factor of 40 and anchor future JWST measurements of this and other cold brown dwarfs, while providing high-precision distance and motion measurements and tight constraints on planetary-mass companions for one of the closest ``stellar object'' to the Sun. ------------------------------------------------------------------------------------ Observations Description ------------------------ This is an astrometric project. ------------------------------------------------------------------------------------ 17080( 2) - 11-Jul-2022 14:34:13 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WISEA-J08551 STAR, BROWN DWARF RA=08H55M3.9073S, J2000 J=24.8 0.74-071442. DEC=-07D14'34.47" 5 Reference Frame: Other: SIMBAD Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 17080( 2) - 11-Jul-2022 14:34:13 - [ 3] Visit: 01 (epoch-01) Visit Requirements: BETWEEN 07-NOV-2022:00:00:00 AND 11-NOV-2022:00:00:00 On Hold Comments: Additional Comments: around Nov 9th, 2022 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=RAPID, NSAMP=7 1 DEF POS TARG -19, +19 10.74-07144 CUM (20.526 S) 2.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -19, +19 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -20, -1 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -21, -21 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +1, +20 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=15 1 DEF POS TARG +0, +0 10.74-07144 CUM (499.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=RAPID, NSAMP=7 1 DEF POS TARG -1, -20 10.74-07144 CUM (20.526 S) 2.5 ------------------------------------------------------------------------------------------------------------------------------------ 8 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -1, -20 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +19, +21 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +20, +0 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 17080( 2) - 11-Jul-2022 14:34:13 - [ 4] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +21, -19 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -1, +1 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 13 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=RAPID, NSAMP=7 1 DEF POS TARG -1, +1 10.74-07144 CUM (20.526 S) 2.5 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ WISEA-J085510.74-07 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 3 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 5 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 7 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 8 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 9 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 10 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 11 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 12 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 13 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM 17080( 2) - 11-Jul-2022 14:34:13 - [ 5] Visit: 02 (epoch-02) Visit Requirements: BETWEEN 06-MAY-2023:00:00:00 AND 14-MAY-2023:00:00:00 On Hold Comments: Additional Comments: around May 10th, 2023 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=RAPID, NSAMP=7 1 DEF POS TARG -19, +19 10.74-07144 CUM (20.526 S) 2.5 ------------------------------------------------------------------------------------------------------------------------------------ 2 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -19, +19 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -20, -1 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -21, -21 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +1, +20 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=15 1 DEF POS TARG +0, +0 10.74-07144 CUM (499.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=RAPID, NSAMP=7 1 DEF POS TARG -1, -20 10.74-07144 CUM (20.526 S) 2.5 ------------------------------------------------------------------------------------------------------------------------------------ 8 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -1, -20 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +19, +21 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +20, +0 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 17080( 2) - 11-Jul-2022 14:34:13 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG +21, -19 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=14 1 DEF POS TARG -1, +1 10.74-07144 CUM (449.234 2.5 S) ------------------------------------------------------------------------------------------------------------------------------------ 13 WISEA-J0855 WFC3/IR MULTIAC IR F160W SAMP-SEQ=RAPID, NSAMP=7 1 DEF POS TARG -1, +1 10.74-07144 CUM (20.526 S) 2.5 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ WISEA-J085510.74-07 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 3 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 4 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 5 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A 1442.5 CUM WISEA-J085510.74-07 7 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 8 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 9 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 10 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 11 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 12 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM WISEA-J085510.74-07 13 WFC3/IR MULTIAC IR F160W none none none none 2 N/A 1442.5 CUM 17080( 2) - 11-Jul-2022 14:34:13 - [ 7] Summary Form for Proposal 17080 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, NSAMP=15, NSAMP=7, SAMP-SEQ=RAPID, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 06-MAY-2023:00:00:00 AND 14-MAY-2023:00:00:00, BETWEEN 07-NOV-2022:00:00:00 AND 11-NOV-2022:00:00:00, POS TARG +0, +0, POS TARG +1, +20, POS TARG +19, +21, POS TARG +20, +0, POS TARG +21, -19, POS TARG -1, +1, POS TARG -1, -20, POS TARG -19, +19, POS TARG -20, -1, POS TARG -21, -21 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names WISEA-J085510.74-071442.5 ------------------------------------------------------------------------------------------------------------------------------------