10810( 6) - 09/19/06 12:29 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10810 Version: 6 Check-in Time: 19-Sep-2006 16:29:15 STScI Edit Number: 0 Title The Gas Dissipation Timescale: Constraining Models of Planet Formation ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Edwin Anthony Bergin University of Michigan CoI: Dr. Gregory J. Herczeg California Institute of Technology N CoI: Dr. Ilaria Pascucci University of Arizona N CoI: Dr. Nuria Calvet University of Michigan N CoI: Dr. John Carpenter California Institute of Technology N CoI: Dr. Michael R. Meyer University of Arizona N CoI: Dr. Evelyne Roueff Observatoire de Paris - Section de Meudon N CoI: Dr. Herve Abgrall Observatoire de Paris N ------------------------------------------------------------------------------------ Abstract We propose to constrain planet-formation models by searching for molecular hydrogen emission around young (10-50 Myr) solar-type stars that have evidence for evolved dust disks. Planet formation models show that the presence of gas in disks is crucial to the formation of BOTH giant and terrestrial planets, influences dust dynamics, and through tidal interactions with giant planets leads to orbital migration. However, there is a lack of systematic information on the presence and lifetime of gas residing at planet-forming radii. We will use a newly identified broad continuum emission feature of molecular hydrogen at 1600 Angstrom to search for residual gas within an orbital radius of 5-10 AU around young stars that have evolved beyond the optically thick T Tauri phase. These observations will enable the most sensitive probe to date of remant gas in circumstellar disks, detecting surfaces densites of ~0.0001 g/cm^2, or less than 10^-5 of the theoretical "mininum mass" solar nebula from which our solar system is thought to have formed. Our observations are designed to be synergistic with ongoing searches for gas emission that is being performed using the Spitzer Space Telescope in that the proposed HST observations are ~100 times more sensitive and will have 50 times higher angular resolution. These combined studies will provide the most comprehensive view of residual gas in proto-planetary disks and can set important constraints on models of planet formation. ------------------------------------------------------------------------------------ 10810( 6) - 09/19/06 12:29 - [ 2] Observations Description ------------------------ A ACS prism observation is being made of 10 young stellar objects to search for an emission feature at 1600 angstrom. The spectral element is the PR130L being used with the SBC on the ACS. A single observation of an orbit in length are scheduled for each target. A pair of short observations is also scheduled, as these are needed for wavelength calibration. The pair of short images are being taken with the F125LP/F140LP/F150LP filters on the SBC/ACS, as this is the closest match in spectral properties to the PR130L and the source emission. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10810( 6) - 09/19/06 12:29 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-98800 STAR, YSO RA=11H22M5.2898S +/- 0.1", DEC=- J2000 V = 9.11 24D46'39.76" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 2 TWA-7 STAR, YSO RA=10H42M30.1100S +/- 0.1", J2000 V = 11.06 DEC=-33D40'16.20" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 3 TWA-13A STAR, YSO RA=11H21M17.2400S +/- 0.1", J2000 V = 10.93 DEC=-34D46'45.50" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 4 HD-61005 STAR, YSO RA=07H35M47.4617S +/- 0.1", J2000 V = 8.22 DEC=-32D12'14.04" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 5 MML-36 STAR, YSO RA=13H37M57.2960S +/- 0.1", J2000 V = 10.03 DEC=-41D34'41.83" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 7 MML-28 STAR, YSO RA=13H01M50.6940S +/- 0.1", J2000 V = 11.1 DEC=-53D04'58.22" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 8 HD-12039 STAR, YSO RA=01H57M48.9777S +/- 0.1", J2000 V = 8.11 DEC=-21D54'5.35" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 9 HD-92945 STAR, YSO RA=10H43M28.2717S +/- 0.1", J2000 V = 7.76 DEC=-29D03'51.42" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 10 HD-202917 STAR, YSO RA=21H20M49.9563S +/- 0.1", J2000 V = 8.67 DEC=-53D02'3.14" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. 11 HD53143 STAR, K V-IV, K III-I RA=06H59M59.6500S +/- 0.2", J2000 V = 6.8 DEC=-61D20'10.26" +/- 0.2" Reference Frame: ICRS 10810( 6) - 09/19/06 12:29 - [ 4] Visit: 01 Visit Priority: Visit Requirements: 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 HD-98800 ACS/SBC ACCUM SBC F165LP 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-98800 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-98800 1 ACS/SBC ACCUM SBC F165LP none none 1 none 1 60.0 S HD-98800 1 ACS/SBC ACCUM SBC F165LP none none 2 none 1 60.0 S HD-98800 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1210.0 S HD-98800 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1210.0 S 10810( 6) - 09/19/06 12:29 - [ 5] Visit: 02 Visit Priority: Visit Requirements: 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 TWA-7 ACS/SBC ACCUM SBC F165LP 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 TWA-7 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ TWA-7 1 ACS/SBC ACCUM SBC F165LP none none 1 none 1 45.0 S TWA-7 1 ACS/SBC ACCUM SBC F165LP none none 2 none 1 45.0 S TWA-7 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1228.0 S TWA-7 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1228.0 S 10810( 6) - 09/19/06 12:29 - [ 6] Visit: 03 Visit Priority: Visit Requirements: 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 TWA-13A ACS/SBC ACCUM SBC F165LP 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 TWA-13A ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ TWA-13A 1 ACS/SBC ACCUM SBC F165LP none none 1 none 1 45.0 S TWA-13A 1 ACS/SBC ACCUM SBC F165LP none none 2 none 1 45.0 S TWA-13A 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1228.0 S TWA-13A 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1228.0 S 10810( 6) - 09/19/06 12:29 - [ 7] Visit: 04 Visit Priority: Visit Requirements: 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 HD-61005 ACS/SBC ACCUM SBC F122M 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-61005 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-61005 1 ACS/SBC ACCUM SBC F122M none none 1 none 1 45.0 S HD-61005 1 ACS/SBC ACCUM SBC F122M none none 2 none 1 45.0 S HD-61005 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1230.0 S HD-61005 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1230.0 S 10810( 6) - 09/19/06 12:29 - [ 8] Visit: 05 Visit Priority: Visit Requirements: 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 MML-36 ACS/SBC ACCUM SBC F122M 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 MML-36 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ MML-36 1 ACS/SBC ACCUM SBC F122M none none 1 none 1 75.0 S MML-36 1 ACS/SBC ACCUM SBC F122M none none 2 none 1 75.0 S MML-36 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1209.0 S MML-36 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1209.0 S 10810( 6) - 09/19/06 12:29 - [ 9] Visit: 07 Visit Priority: Visit Requirements: 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 MML-28 ACS/SBC ACCUM SBC F165LP 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 MML-28 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ MML-28 1 ACS/SBC ACCUM SBC F165LP none none 1 none 1 64.0 S MML-28 1 ACS/SBC ACCUM SBC F165LP none none 2 none 1 64.0 S MML-28 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1233.0 S MML-28 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1233.0 S 10810( 6) - 09/19/06 12:29 - [ 10] Visit: 08 Visit Priority: Visit Requirements: 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 HD-12039 ACS/SBC ACCUM SBC F122M 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-12039 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-12039 1 ACS/SBC ACCUM SBC F122M none none 1 none 1 53.0 S HD-12039 1 ACS/SBC ACCUM SBC F122M none none 2 none 1 53.0 S HD-12039 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1220.0 S HD-12039 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1220.0 S 10810( 6) - 09/19/06 12:29 - [ 11] Visit: 09 Visit Priority: Visit Requirements: 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 HD-92945 ACS/SBC ACCUM SBC F165LP 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-92945 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-92945 1 ACS/SBC ACCUM SBC F165LP none none 1 none 1 44.0 S HD-92945 1 ACS/SBC ACCUM SBC F165LP none none 2 none 1 44.0 S HD-92945 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1227.0 S HD-92945 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1227.0 S 10810( 6) - 09/19/06 12:29 - [ 12] Visit: 10 Visit Priority: Visit Requirements: 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 HD-202917 ACS/SBC ACCUM SBC F165LP 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-202917 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-202917 1 ACS/SBC ACCUM SBC F165LP none none 1 none 1 45.0 S HD-202917 1 ACS/SBC ACCUM SBC F165LP none none 2 none 1 45.0 S HD-202917 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1252.0 S HD-202917 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1252.0 S 10810( 6) - 09/19/06 12:29 - [ 13] Visit: 11 Visit Priority: Visit Requirements: 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 HD53143 ACS/SBC ACCUM SBC F122M 2 360 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 HD53143 ACS/SBC ACCUM SBC PR130L 2 1800 S 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD53143 1 ACS/SBC ACCUM SBC F122M none none 1 none 1 81.0 S HD53143 1 ACS/SBC ACCUM SBC F122M none none 2 none 1 81.0 S HD53143 2 ACS/SBC ACCUM SBC PR130L none none 1 none 1 1240.0 S HD53143 2 ACS/SBC ACCUM SBC PR130L none none 2 none 1 1240.0 S 10810( 6) - 09/19/06 12:29 - [ 14] Summary Form for Proposal 10810 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures SBC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/SBC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F165LP PR130L F122M ------------------------------------------------------------------------------------------------------------------------------------ Target Names HD-98800 TWA-7 TWA-13A HD-61005 MML-36 MML-28 HD-12039 HD-92945 HD-202917 HD53143 ------------------------------------------------------------------------------------------------------------------------------------