12225( 4) - 04-Aug-2010 16:21:51 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12225 Version: 4 Check-in Time: 04-Aug-2010 16:21:51 STScI Edit Number: 1 Title Imaging accretion sources and circumbinary disks in young brown dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Ansgar Reiners Universitaet Goettingen, Institut fuer Astrophysik CoI: Dr. Paul Kalas University of California - Berkeley N ------------------------------------------------------------------------------------ Abstract We propose to obtain deep WFC3/UVIS imaging observations of two accreting, nearby, young brown dwarf binaries. The first, 2M1207, is a brown dwarf with a planetary mass companion that became a benchmark in low-mass star formation and low-mass evolutionary models. The second, 2M0041, is a nearby young brown dwarf with clear evidence for accretion, but its space motion suggests a slightly higher age than the canonical accretion lifetime of 5-10 Myr. It has recently been discovered to be a binary and is likely to become a second benchmark object in this field. With narrow band images centered on the Halpha line that is indicative of accretion, we aim to determine the accretion ratio between the two components in each system. Halpha was observed in both systems but so far not spatially resolved. In particular, we want to search for accretion in the planetary mass companion of 2M1207. The evidence for accretion in 2M0041 and the possibility that it is in fact older than 10Myr suggests that the accretion lifetime is longer in brown dwarfs than in stars, and in particular that it is longer in brown dwarf binaries. Accretion could be sustained for a longer time if the accreting material is replenished by a circumbinary disk that might exist in both systems. We propose deep WFC/UVIS observations in the optical to search for circumbinary disks, similar to the famous disk around the binary TTauri system GG Tau. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program aims to detect H-alpha from young, low mass objects and produce a high-contrast imageof the environment to detect circumstellar disks. To minimize buffer overheads, the H-alpha portion of the experiment uses a 512x512 subarray. The longer exposures for circumstellar material in optical scattered light utilize the F606W filter with a 2Kx2K subarray. For PSF subtraction, we use several rolls for each of the two sources (2M0041 and 2M1207). Real Time Justification ----------------------- Calibration Justification ------------------------- 12225( 4) - 04-Aug-2010 16:21:51 - [ 2] Additional Comments ------------------- For optimal PSF subtraction, the orbits (for each of the two sources) should be consecutive orbits. We specify GROUP WITHIN and ORIENT FROM commands. The ORIENT FROM should be the maximum allowable (typically 30 degrees). ------------------------------------------------------------------------------------ 12225( 4) - 04-Aug-2010 16:21:51 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NAME-2M1207A STAR, BROWN DWARF RA=12H07M33.4700S +/- 0.1", J2000 V = 18.9 DEC=-39D32'54.00" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASSI-J0041 STAR, BROWN DWARF RA=00H41M35.3900S +/- 0.1", J2000 V = 18.0 353-562112 DEC=-56D21'12.77" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 12225( 4) - 04-Aug-2010 16:21:51 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12225( 4) - 04-Aug-2010 16:21:51 - [ 5] Visit: 01 Visit Requirements: GROUP 01, 02 WITHIN 2 Orbits 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 2MASSI-J004 WFC3/UVI ACCUM UVIS2-M51 F656N 1 20 S GS ACQ SCENARIO BASE1B3; 1353-562112 S 2C-SUB PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASSI-J004 WFC3/UVI ACCUM UVIS2-M51 F645N 1 20 S 1353-562112 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASSI-J004 WFC3/UVI ACCUM UVIS2-M51 F606W CR-SPLIT=2 1 20 S 1353-562112 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASSI-J004 WFC3/UVI ACCUM UVIS-FIX F606W CR-SPLIT=3 1 2160 S SAME POS AS 3 1353-562112 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASSI-J0041353-562 1 WFC3/UVI ACCUM UVIS2-M5 F656N 1 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 1 WFC3/UVI ACCUM UVIS2-M5 F656N 2 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 1 WFC3/UVI ACCUM UVIS2-M5 F656N 3 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 2 WFC3/UVI ACCUM UVIS2-M5 F645N 1 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 2 WFC3/UVI ACCUM UVIS2-M5 F645N 2 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 2 WFC3/UVI ACCUM UVIS2-M5 F645N 3 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 1 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 2 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 1 1 N/A 112 S 2MASSI-J0041353-562 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 2 1 N/A 112 S 2MASSI-J0041353-562 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 3 1 N/A 112 S 12225( 4) - 04-Aug-2010 16:21:51 - [ 6] Visit: 02 Visit Requirements: ORIENT 35D TO 37D FROM 01 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 2MASSI-J004 WFC3/UVI ACCUM UVIS2-M51 F656N 1 20 S GS ACQ SCENARIO BASE1B3; 1353-562112 S 2C-SUB PATTERN 1 1-2 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASSI-J004 WFC3/UVI ACCUM UVIS2-M51 F645N 1 20 S 1353-562112 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASSI-J004 WFC3/UVI ACCUM UVIS2-M51 F606W CR-SPLIT=2 1 20 S 1353-562112 S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASSI-J004 WFC3/UVI ACCUM UVIS-FIX F606W CR-SPLIT=3 1 2160 S SAME POS AS 3 1353-562112 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASSI-J0041353-562 1 WFC3/UVI ACCUM UVIS2-M5 F656N 1 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 1 WFC3/UVI ACCUM UVIS2-M5 F656N 2 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 1 WFC3/UVI ACCUM UVIS2-M5 F656N 3 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 2 WFC3/UVI ACCUM UVIS2-M5 F645N 1 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 2 WFC3/UVI ACCUM UVIS2-M5 F645N 2 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 2 WFC3/UVI ACCUM UVIS2-M5 F645N 3 none none none 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 1 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 2 1 N/A 112 S 12C-SUB 2MASSI-J0041353-562 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 1 1 N/A 112 S 2MASSI-J0041353-562 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 2 1 N/A 112 S 2MASSI-J0041353-562 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 3 1 N/A 112 S 12225( 4) - 04-Aug-2010 16:21:51 - [ 7] Visit: 03 Visit Requirements: GROUP 03, 04, 05 WITHIN 3 Orbits 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 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F656N CR-SPLIT=3 1 120 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 2 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F645N CR-SPLIT=3 1 120 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F606W CR-SPLIT=2 1 40 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 NAME-2M1207 WFC3/UVI ACCUM UVIS-FIX F606W CR-SPLIT=3 1 1908 S SAME POS AS 3 A 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 1 1 N/A S 12C-SUB NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 2 1 N/A S 12C-SUB NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 3 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 1 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 2 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 3 1 N/A S 12C-SUB NAME-2M1207A 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 1 1 N/A S 12C-SUB NAME-2M1207A 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 2 1 N/A S 12C-SUB NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 1 1 N/A S NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 2 1 N/A S NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 3 1 N/A S 12225( 4) - 04-Aug-2010 16:21:51 - [ 8] Visit: 04 Visit Requirements: ORIENT 15D TO 15.1D FROM 03 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 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F656N CR-SPLIT=3 1 120 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 2 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F645N CR-SPLIT=3 1 120 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F606W CR-SPLIT=2 1 40 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 NAME-2M1207 WFC3/UVI ACCUM UVIS-FIX F606W CR-SPLIT=3 1 1908 S SAME POS AS 3 A 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 1 1 N/A S 12C-SUB NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 2 1 N/A S 12C-SUB NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 3 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 1 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 2 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 3 1 N/A S 12C-SUB NAME-2M1207A 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 1 1 N/A S 12C-SUB NAME-2M1207A 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 2 1 N/A S 12C-SUB NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 1 1 N/A S NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 2 1 N/A S NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 3 1 N/A S 12225( 4) - 04-Aug-2010 16:21:51 - [ 9] Visit: 05 Visit Requirements: ORIENT 30D TO 30.1D FROM 03 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 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F656N CR-SPLIT=3 1 120 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 2 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F645N CR-SPLIT=3 1 120 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 3 NAME-2M1207 WFC3/UVI ACCUM UVIS2-M51 F606W CR-SPLIT=2 1 40 S A S 2C-SUB ------------------------------------------------------------------------------------------------------------------------------------ 4 NAME-2M1207 WFC3/UVI ACCUM UVIS-FIX F606W CR-SPLIT=3 1 1908 S SAME POS AS 3 A 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 | ------------------------------------------------------------------------------------------------------------------------------------ NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 1 1 N/A S 12C-SUB NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 2 1 N/A S 12C-SUB NAME-2M1207A 1 WFC3/UVI ACCUM UVIS2-M5 F656N none none none 3 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 1 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 2 1 N/A S 12C-SUB NAME-2M1207A 2 WFC3/UVI ACCUM UVIS2-M5 F645N none none none 3 1 N/A S 12C-SUB NAME-2M1207A 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 1 1 N/A S 12C-SUB NAME-2M1207A 3 WFC3/UVI ACCUM UVIS2-M5 F606W none none none 2 1 N/A S 12C-SUB NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 1 1 N/A S NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 2 1 N/A S NAME-2M1207A 4 WFC3/UVI ACCUM UVIS-FIX F606W none none none 3 1 N/A S 12225( 4) - 04-Aug-2010 16:21:51 - [ 10] Summary Form for Proposal 12225 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-FIX, UVIS2-M512C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, CR-SPLIT=3 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GROUP 01, 02 WITHIN 2 Orbits, GROUP 03, 04, 05 WITHIN 3 Orbits, GS ACQ SCENARIO BASE1B3, ORIENT 15D TO 15.1D FROM 03, ORIENT 30D TO 30.1D FROM 03, ORIENT 35D TO 37D FROM 01, PATTERN 1 1-2, SAME POS AS 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, F645N, F656N ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASSI-J0041353-562112, NAME-2M1207A ------------------------------------------------------------------------------------------------------------------------------------