12317( 2) - 22-Jun-2010 13:08:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12317 Version: 2 Check-in Time: 22-Jun-2010 13:08:23 STScI Edit Number: 1 Title Dynamical Masses of the Coolest Brown Dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 17 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Michael C. Liu University of Hawaii CoI: Mr. Trent J. Dupuy University of Hawaii N CoI: Dr. Michael J. Ireland University of Sydney N ------------------------------------------------------------------------------------ Abstract T dwarfs are excellent laboratories to study the evolution and the atmospheric physics of both brown dwarfs and extrasolar planets. To date, only a single T dwarf binary has a dynamical mass determination, and more are sorely needed. The prospects of measuring more dynamical masses over the next decade are limited to 6 known short-period T dwarf binaries. We propose here to obtain Long-Term HST/ACS monitoring for the 3 of the 6 binaries which cannot be resolved with AO from the ground. Upon completion, our program will substantially increase the number of T dwarf dynamical mass measurements and thereby provide key benchmarks for testing theoretical models of ultracool objects. ------------------------------------------------------------------------------------ Observations Description ------------------------ Orbital monitoring of 3 methane brown dwarf (T dwarf) binaries. This is a long-term program with 6 epochs of imaging per target over 3 years. One PSF star (eps IndiBab) will be observed in the first year (Cycle 17). Images should be taken at an interval of at least a few months, which drives the requested time constraints. If images are taken too close together in time they become much less useful in determining the orbits of our targets. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12317( 2) - 22-Jun-2010 13:08:23 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ042348. STAR, BROWN DWARF RA=04H23M48.5900S +/- 0.1", J2000 V = 25 J=14.5, H=13.5, K=12.9 57-041403.5 DEC=-04D14'3.50" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASSJ051859 STAR, BROWN DWARF RA=05H18M59.9500S +/- 0.1", J2000 V = 25 J=16.0, H=14.8, K=14.2 95-2828372 DEC=-28D28'37.20" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 SDSSJ092615. STAR, BROWN DWARF RA=09H26M15.3800S +/- 0.1", J2000 V = 25 J=15.9, H=15.3, K=15.5 38+584720.9 DEC=+58D47'20.90" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 12317( 2) - 22-Jun-2010 13:08:23 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.011 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 8 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.364 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 47.23 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 7 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12317( 2) - 22-Jun-2010 13:08:23 - [ 4] Visit: 01 Visit Requirements: BETWEEN 01-DEC-2010:00:00:00 AND 01-APR-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ042348 ACS/WFC ACCUM WFC1-1K F814W 1 340 S PATTERN 7 1 .57-041403. see below 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ042348 ACS/WFC ACCUM WFC1-1K F814W 1 340 S PATTERN 8 2 .57-041403. see below 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 347.0 S 03.5 12317( 2) - 22-Jun-2010 13:08:23 - [ 5] Visit: 02 Visit Requirements: BETWEEN 01-JUL-2011:00:00:00 AND 31-DEC-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ042348 ACS/WFC ACCUM WFC1-1K F814W 1 340 S PATTERN 7 1 .57-041403. see below 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ042348 ACS/WFC ACCUM WFC1-1K F814W 1 340 S PATTERN 8 2 .57-041403. see below 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 347.0 S 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 347.0 S 03.5 12317( 2) - 22-Jun-2010 13:08:23 - [ 6] Visit: 03 Visit Requirements: BETWEEN 05-NOV-2010:00:00:00 AND 11-JAN-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASSJ05185 ACS/WFC ACCUM WFC F814W 1 1276 S PATTERN 1 1 995-2828372 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 1271.0 S 372 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 1271.0 S 372 12317( 2) - 22-Jun-2010 13:08:23 - [ 7] Visit: 04 Visit Requirements: BETWEEN 11-APR-2011:00:00:00 AND 31-DEC-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASSJ05185 ACS/WFC ACCUM WFC F814W 1 1276 S PATTERN 1 1 995-2828372 see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 1271.0 S 372 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 1271.0 S 372 12317( 2) - 22-Jun-2010 13:08:23 - [ 8] Visit: 05 Visit Requirements: BETWEEN 17-SEP-2010:00:00:00 AND 01-JAN-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ092615 ACS/WFC ACCUM WFC F814W 1 1401 S PATTERN 1 1 .38+584720. see below 9 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ092615.38+5847 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 1398.0 S 20.9 SDSSJ092615.38+5847 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 1398.0 S 20.9 12317( 2) - 22-Jun-2010 13:08:23 - [ 9] Visit: 06 Visit Requirements: BETWEEN 10-MAR-2011:00:00:00 AND 31-DEC-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SDSSJ092615 ACS/WFC ACCUM WFC F814W 1 1401 S PATTERN 1 1 .38+584720. see below 9 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SDSSJ092615.38+5847 1 ACS/WFC ACCUM WFC F814W 1 none none none 1 1398.0 S 20.9 SDSSJ092615.38+5847 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 1398.0 S 20.9 12317( 2) - 22-Jun-2010 13:08:23 - [ 10] Summary Form for Proposal 12317 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC, WFC1-1K ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-DEC-2010:00:00:00 AND 01-APR-2011:00:00:00, BETWEEN 01-JUL-2011:00:00:00 AND 31-DEC-2011:00:00:00, BETWEEN 05-NOV-2010:00:00:00 AND 11-JAN-2011:00:00:00, BETWEEN 10-MAR-2011:00:00:00 AND 31-DEC-2011:00:00:00, BETWEEN 11-APR-2011:00:00:00 AND 31-DEC-2011:00:00:00, BETWEEN 17-SEP-2010:00:00:00 AND 01-JAN-2011:00:00:00, PATTERN 1 1, PATTERN 7 1, PATTERN 8 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASSJ05185995-2828372, SDSSJ042348.57-041403.5, SDSSJ092615.38+584720.9 ------------------------------------------------------------------------------------------------------------------------------------