15270( 2) - 17-Jul-2017 17:35:26 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15270 Version: 2 Check-in Time: 17-Jul-2017 17:35:26 STScI Edit Number: 0 Title The Coolest Sample of Brown Dwarf Dynamical Masses ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Trent J. Dupuy University of Texas at Austin Y CoI: Dr. Michael C. Liu University of Hawaii N CoI: Dr. Mark S. Marley NASA Ames Research Center N CoI: Mr. William Best University of Hawaii N ------------------------------------------------------------------------------------ Abstract We propose a 3-year orbit monitoring program to measure the first dynamical masses for brown dwarfs below 1100 K. With projected separations of only 1-2 AU, our targets are among the tightest substellar visual binaries ever found and are amenable to orbit determinations within only a few years. When combined with our parallax determinations, these data will yield dynamical masses with <10% uncertainties. Our targets have been discovered at the limits of existing facilities and thus promise to be the only viable objects in this temperature regime (350-1000 K) for direct mass measurements during the JWST era. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of our observations is to obtain precise relative astrometry (~3-5 mas) for six brown dwarf binaries. Our data spanning 3 cycles will allow us to determine their orbits and thereby measure their dynamical masses. ACS/WFC enables a finer pixel scale than WFC3/IR and better sensitivity than WFC3/UVIS, both of which (high SNR, and better deblending of our tight 0.07"-0.11" binaries) are key to achieving our science goals. We use a standard 3-position dither sequence to guard against cosmic rays and to sample different parts of the detector in case our target lands on a bad pixel in a single pointing. We set the exposure times to fill the time available in each visit, which will yield SNR of ~30 for our faintest target (WISE0146, J=20.7) and will still be far from saturating any other of our sources in F850LP (the brightest is J=16.4). ------------------------------------------------------------------------------------ 15270( 2) - 17-Jul-2017 17:35:26 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WISEJ014656. STAR, BROWN DWARF, T RA=01H46M56.6400S, J2000 J=20.7 mag 66+423410.0 DEC=+42D34'9.05" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 2 WISEJ090649. STAR, BROWN DWARF, T RA=09H06M49.3310S, J2000 J=18.2 mag 35+473538.5 DEC=+47D35'38.11" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2010.5589 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 3 WISEJ095259. STAR, BROWN DWARF, T RA=09H52M59.2927S, J2000 J=17.1 mag 29+195508.1 DEC=+19D55'8.20" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2010.5589 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 CFBDSIRJ1458 STAR, BROWN DWARF, T RA=14H58M29.3963S, J2000 z'(AB)=23.6 mag, J=19.7 mag +10AB DEC=+10D13'41.65" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2010.5589 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 5 WISEJ162208. STAR, BROWN DWARF, T RA=16H22M8.9377S, J2000 J=16.4 mag 93-095934.4 DEC=-09D59'34.77" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2010.5589 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6 WISEJ201547. STAR, BROWN DWARF, T RA=20H15M46.4493S, J2000 J=16.9 mag 05+664646.0 DEC=+66D46'45.19" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2010.5589 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 15270( 2) - 17-Jul-2017 17:35:26 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15270( 2) - 17-Jul-2017 17:35:26 - [ 4] Visit: 01 Visit Requirements: BETWEEN 14-JUN-2018:00:00:00 AND 21-AUG-2018:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ014656 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .66+423410. see below 0 (2421 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ014656.66+4234 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 807.0 S 10.0 WISEJ014656.66+4234 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 807.0 S 10.0 WISEJ014656.66+4234 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 807.0 S 10.0 15270( 2) - 17-Jul-2017 17:35:26 - [ 5] Visit: 02 Visit Requirements: BEFORE 29-DEC-2017:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ090649 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .35+473538. see below 5 (2466 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ090649.35+4735 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 822.0 S 38.5 WISEJ090649.35+4735 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 822.0 S 38.5 WISEJ090649.35+4735 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 822.0 S 38.5 15270( 2) - 17-Jul-2017 17:35:26 - [ 6] Visit: 03 Visit Requirements: BETWEEN 14-MAY-2018:00:00:00 AND 13-JUN-2018:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ090649 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .35+473538. see below 5 (2466 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ090649.35+4735 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 822.0 S 38.5 WISEJ090649.35+4735 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 822.0 S 38.5 WISEJ090649.35+4735 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 822.0 S 38.5 15270( 2) - 17-Jul-2017 17:35:26 - [ 7] Visit: 04 Visit Requirements: BETWEEN 07-MAR-2018:00:00:00 AND 24-APR-2018:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ095259 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .29+195508. see below 1 (2337 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ095259.29+1955 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 779.0 S 08.1 WISEJ095259.29+1955 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 779.0 S 08.1 WISEJ095259.29+1955 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 779.0 S 08.1 15270( 2) - 17-Jul-2017 17:35:26 - [ 8] Visit: 05 Visit Requirements: BETWEEN 07-JUN-2018:00:00:00 AND 18-SEP-2018:00:00:00 On Hold Comments: Additional Comments: 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 CFBDSIRJ145 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 8+10AB see below (2331 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CFBDSIRJ1458+10AB 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 777.0 S CFBDSIRJ1458+10AB 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 777.0 S CFBDSIRJ1458+10AB 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 777.0 S 15270( 2) - 17-Jul-2017 17:35:26 - [ 9] Visit: 06 Visit Requirements: BETWEEN 09-JUN-2018:00:00:00 AND 10-OCT-2018:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ162208 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .93-095934. see below 4 (2328 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ162208.93-0959 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 776.0 S 34.4 WISEJ162208.93-0959 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 776.0 S 34.4 WISEJ162208.93-0959 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 776.0 S 34.4 15270( 2) - 17-Jul-2017 17:35:26 - [ 10] Visit: 07 Visit Requirements: BEFORE 05-OCT-2017:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ201547 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .05+664646. see below 0 (2667 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ201547.05+6646 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 889.0 S 46.0 WISEJ201547.05+6646 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 889.0 S 46.0 WISEJ201547.05+6646 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 889.0 S 46.0 15270( 2) - 17-Jul-2017 17:35:26 - [ 11] Visit: 08 Visit Requirements: BETWEEN 02-MAR-2018:00:00:00 AND 16-MAY-2018:00:00:00 On Hold Comments: Additional Comments: 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 WISEJ201547 ACS/WFC ACCUM WFC1-CTE F850LP 1 700 S PATTERN 1 1 .05+664646. see below 0 (2667 S) ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WISEJ201547.05+6646 1 ACS/WFC ACCUM WFC1-CTE F850LP 1 none none none 1 889.0 S 46.0 WISEJ201547.05+6646 1 ACS/WFC ACCUM WFC1-CTE F850LP 2 none none none 1 889.0 S 46.0 WISEJ201547.05+6646 1 ACS/WFC ACCUM WFC1-CTE F850LP 3 none none none 1 889.0 S 46.0 15270( 2) - 17-Jul-2017 17:35:26 - [ 12] Summary Form for Proposal 15270 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 05-OCT-2017:00:00:00, BEFORE 29-DEC-2017:00:00:00, BETWEEN 02-MAR-2018:00:00:00 AND 16-MAY-2018:00:00:00, BETWEEN 07-JUN-2018:00:00:00 AND 18-SEP-2018:00:00:00, BETWEEN 07-MAR-2018:00:00:00 AND 24-APR-2018:00:00:00, BETWEEN 09-JUN-2018:00:00:00 AND 10-OCT-2018:00:00:00, BETWEEN 14-JUN-2018:00:00:00 AND 21-AUG-2018:00:00:00, BETWEEN 14-MAY-2018:00:00:00 AND 13-JUN-2018:00:00:00, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F850LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names CFBDSIRJ1458+10AB, WISEJ014656.66+423410.0, WISEJ090649.35+473538.5, WISEJ095259.29+195508.1, WISEJ162208.93-095934.4, WISEJ201547.05+664646.0 ------------------------------------------------------------------------------------------------------------------------------------