12661( 6) - 25-Sep-2012 14:26:20 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12661 Version: 6 Check-in Time: 25-Sep-2012 14:26:20 STScI Edit Number: 5 Title Dynamical Masses of the Coolest Brown Dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Michael C. Liu University of Hawaii Y CoI: Dr. Trent J. Dupuy Smithsonian Institution Astrophysical N Observatory CoI: Dr. Michael J. Ireland Macquarie University 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. Cycle 19 is the final year of this program, and the BETWEEN requirements are set by the need to have each binary's observation epochs be separated by at least ~4 months as justified in the original Phase 1 proposal. According to the latest scheduling information available for our Cycle 18 visits as of this Phase 2 submission, all 3 of our targets will be observed between August and October of 2011. Thus, we will obtain new data in the spring and fall of 2012. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12661( 6) - 25-Sep-2012 14:26:20 - [ 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. ------------------------------------------------------------------------------------------------------------------------------------ 12661( 6) - 25-Sep-2012 14:26:20 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 12661( 6) - 25-Sep-2012 14:26:20 - [ 4] Visit: 01 Visit Requirements: PCS MODE FINE; BETWEEN 07-FEB-2012 AND 07-APR-2012 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 1 350 S PATTERN 7 1 .57-041403. 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ042348 ACS/WFC ACCUM WFC1-1K F814W 1 340 S PATTERN 8 2 .57-041403. 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 N/A 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 N/A 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 1 N/A 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 1 N/A 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 N/A 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 N/A 03.5 12661( 6) - 25-Sep-2012 14:26:20 - [ 5] Visit: 02 Visit Requirements: PCS MODE FINE; BETWEEN 07-AUG-2012 AND 30-NOV-2012 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. 5 ------------------------------------------------------------------------------------------------------------------------------------ 2 SDSSJ042348 ACS/WFC ACCUM WFC1-1K F814W 1 340 S PATTERN 8 2 .57-041403. 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 N/A 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 N/A 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 1 N/A 03.5 SDSSJ042348.57-0414 1 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 1 N/A 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 N/A 03.5 SDSSJ042348.57-0414 2 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 N/A 03.5 12661( 6) - 25-Sep-2012 14:26:20 - [ 6] Visit: 03 Visit Requirements: PCS MODE FINE; BETWEEN 03-FEB-2012 AND 15-APR-2012 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 1271 S PATTERN 1 1 995-2828372 ------------------------------------------------------------------------------------------------------------------------------------ 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 N/A 372 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A 372 12661( 6) - 25-Sep-2012 14:26:20 - [ 7] Visit: 04 Visit Requirements: PCS MODE FINE; BETWEEN 15-AUG-2012 AND 30-NOV-2012 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 1271 S PATTERN 1 1 995-2828372 ------------------------------------------------------------------------------------------------------------------------------------ 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 N/A 372 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A 372 12661( 6) - 25-Sep-2012 14:26:20 - [ 8] Visit: 05 Visit Requirements: PCS MODE FINE; BETWEEN 03-FEB-2012 AND 15-APR-2012 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 1398 S PATTERN 1 1 .38+584720. 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 N/A 20.9 SDSSJ092615.38+5847 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A 20.9 12661( 6) - 25-Sep-2012 14:26:20 - [ 9] Visit: 06 Visit Requirements: PCS MODE FINE; BETWEEN 15-AUG-2012 AND 30-NOV-2012 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 1398 S PATTERN 1 1 .38+584720. 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 N/A 20.9 SDSSJ092615.38+5847 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A 20.9 12661( 6) - 25-Sep-2012 14:26:20 - [ 10] Visit: 54 Visit Requirements: PCS MODE FINE; BETWEEN 15-AUG-2012 AND 30-NOV-2012 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 1271 S PATTERN 1 1 995-2828372 ------------------------------------------------------------------------------------------------------------------------------------ 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 N/A 372 2MASSJ05185995-2828 1 ACS/WFC ACCUM WFC F814W 2 none none none 1 N/A 372 12661( 6) - 25-Sep-2012 14:26:20 - [ 11] Summary Form for Proposal 12661 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC, WFC1-1K ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 03-FEB-2012 AND 15-APR-2012, BETWEEN 07-AUG-2012 AND 30-NOV-2012, BETWEEN 07-FEB-2012 AND 07-APR-2012, BETWEEN 15-AUG-2012 AND 30-NOV-2012, PATTERN 1 1, PATTERN 7 1, PATTERN 8 2, PCS MODE FINE ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASSJ05185995-2828372, SDSSJ042348.57-041403.5, SDSSJ092615.38+584720.9 ------------------------------------------------------------------------------------------------------------------------------------