12255( 6) - 17-May-2011 11:22:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12255 Version: 6 Check-in Time: 17-May-2011 11:22:33 STScI Edit Number: 2 Title Probing Ultracool Atmospheres and Substellar Interiors with Dynamical Masses ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Trent J. Dupuy Smithsonian Institution Astrophysical Observatory CoI: Dr. Isabelle Baraffe University of Exeter N CoI: Dr. Michael J. Ireland University of Sydney N CoI: Dr. Michael C. Liu University of Hawaii N CoI: Dr. Jeff A. Valenti Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract After years of patient orbital monitoring, there is now a large sample of very low-mass stars and brown dwarfs with precise (~5%) dynamical masses. These binaries represent the gold standard for testing substellar theoretical models. Work to date has identified problems with the model-predicted broad-band colors, effective temperatures, and possibly even luminosity evolution with age. However, our ability to test models is currently limited by how well the individual components of these highly prized binaries are characterized. To solve this problem, we propose to use NICMOS and STIS to characterize this first large sample of ultracool binaries with well-determined dynamical masses. We will use NICMOS multi-band photometry to measure the SEDs of the binary components and thereby precisely estimate their spectral types and effective temperatures. We will use STIS to obtain resolved spectroscopy of the Li I doublet at 6708 A for a subset of three binaries whose masses lie very near the theoretical mass limit for lithium burning. The STIS data will provide the first ever resolved lithium measurements for brown dwarfs of known mass, enabling a direct probe of substellar interiors. Our proposed HST observations to characterize the components of these binaries is much less daunting in comparison to the years of orbital monitoring needed to yield dynamical masses, but these HST data are equally vital for robust tests of theory. ------------------------------------------------------------------------------------ Observations Description ------------------------ STIS medium-resolution spectroscopy of 3 brown dwarf binaries. The highest resolution grating (G750M) will be used to measure lithium absorption at 6708 A. Two of the targets are relatively bright late-M dwarf binaries (3 orbits each), and one is a fainter L dwarf binary (4 orbits). Two of our targets are near (2.6" and 5") very bright stars, so their coordinates are specified as precise offsets from these stars. Rather than specify orientation constraints to align the binaries along the slit, we have specified time constraints excluding any dates when it would not be possible to do so. This is because the binaries' position angles are changing significantly over Cycle 18. We will need to specify the ORIENT angle once our observations are actually scheduled. Real Time Justification 12255( 6) - 17-May-2011 11:22:33 - [ 2] ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12255( 6) - 17-May-2011 11:22:33 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LP349-25 STAR, BROWN DWARF RA=00H27M55.9300S +/- 0.1", J2000 SDSS i = 14.5 mag DEC=+22D19'32.80" +/- 0.1" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1997.75 0.032315757943101917 -0.1529 0.07582 ------------------------------------------------------------------------------------------------------------------------------------ 2 GL569B STAR, BROWN DWARF RA-OFF=0.19975S +/- 0.00011S, J2000 SDSS i = 14.6 mag DEC-OFF=3.9656" +/- 0.0022", FROM 5 Reference Frame: ICRS Comments: Offset measured from Keck AO images on 2010 May 22 UT: 4.9703+-0.0026" separation at PA = 37.07+-0.02 deg. This target is a companion to the offset star, so it shares the offset star's proper motion and parallax. ------------------------------------------------------------------------------------------------------------------------------------ 3 HD130948B STAR, BROWN DWARF RA-OFF=0.1710S +/- 0.0003S, J2000 SDSS i = 18.3 mag DEC-OFF=-0.5877" +/- 0.0013", FROM 4 Reference Frame: ICRS Comments: Offset measured from Keck AO images on 2010 Mar 22 UT: 2.631+-0.005" separation at PA = 102.91+-0.05 deg. This target is a companion to the offset star, so it shares the offset star's proper motion and parallax. ------------------------------------------------------------------------------------------------------------------------------------ 4 HD130948A STAR, G V-IV RA=14H50M15.7188S +/- 0.00024", J2000 V = 5.9 DEC=+23D54'42.36" +/- 0.00020" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1991.25 0.010494757326441638 0.03269 0.05503 ------------------------------------------------------------------------------------------------------------------------------------ 5 GL569A STAR, M V-IV RA=14H54M29.0695S +/- 0.00160", J2000 V = 10.2 DEC=+16D06'4.89" +/- 0.00117" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 1991.25 0.019151254306128337 -0.12169 0.10359 ------------------------------------------------------------------------------------------------------------------------------------ 12255( 6) - 17-May-2011 11:22:33 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.6 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12255( 6) - 17-May-2011 11:22:33 - [ 5] Visit: 01 Visit Requirements: ORIENT 248D TO 268 D; BETWEEN 11-OCT-2010:00:00:00 AND 26-JAN-2011:00:00:00; BETWEEN 25-MAY-2011:00:00:00 AND 31-AUG-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 LP349-25 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 5 S SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 LP349-25 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 1 S K ------------------------------------------------------------------------------------------------------------------------------------ 3 LP349-25 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S PATTERN 1 3 see below ------------------------------------------------------------------------------------------------------------------------------------ 4 LP349-25 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 1 S SEQ 4 NON-INT; PATTERN 1 see below 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 LP349-25 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S SEQ 5-6 NON-INT; PATTERN see below 1 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.1 G750M 6768 2 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ LP349-25 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A LP349-25 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K LP349-25 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 1 491.0 S LP349-25 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 1 491.0 S LP349-25 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 1 491.0 S LP349-25 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 1 491.0 S LP349-25 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 2 684.5 S LP349-25 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 2 684.5 S LP349-25 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 2 684.5 S LP349-25 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 2 684.5 S LP349-25 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 3 685.0 S LP349-25 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 3 685.0 S LP349-25 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 3 685.0 S LP349-25 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 3 685.0 S CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750M 6768 none none 1 none 3 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750M 6768 none none 2 none 3 N/A 12255( 6) - 17-May-2011 11:22:33 - [ 6] Visit: 02 Visit Requirements: ORIENT 90D TO 110 D; BETWEEN 25-JUL-2011:00:00:00 AND 15-AUG-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 GL569A STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=POINT 1 5 S SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 GL569B STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 1 S K ------------------------------------------------------------------------------------------------------------------------------------ 3 GL569B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S PATTERN 1 3 see below ------------------------------------------------------------------------------------------------------------------------------------ 4 GL569B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S SEQ 4 NON-INT; PATTERN 1 see below 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 GL569B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S SEQ 5-6 NON-INT; PATTERN see below 1 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.1 G750M 6768 2 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ GL569A 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A GL569B 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K GL569B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 1 474.0 S GL569B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 1 474.0 S GL569B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 1 474.0 S GL569B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 1 474.0 S GL569B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 2 685.0 S GL569B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 2 685.0 S GL569B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 2 685.0 S GL569B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 2 685.0 S GL569B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 3 684.0 S GL569B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 3 684.0 S GL569B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 3 684.0 S GL569B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 3 684.0 S CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750M 6768 none none 1 none 3 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750M 6768 none none 2 none 3 N/A 12255( 6) - 17-May-2011 11:22:33 - [ 7] Visit: 03 Visit Requirements: ORIENT 167D TO 187 D; BETWEEN 21-APR-2012:00:00:00 AND 19-MAY-2012:00:00:00 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 HD130948A STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=POINT 1 0.2 S SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD130948B STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 10 S K ------------------------------------------------------------------------------------------------------------------------------------ 3 HD130948B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S PATTERN 1 3 see below ------------------------------------------------------------------------------------------------------------------------------------ 4 HD130948B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S SEQ 4 NON-INT; PATTERN 1 see below 4 ------------------------------------------------------------------------------------------------------------------------------------ 5 HD130948B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S SEQ 5 NON-INT; PATTERN 1 see below 5 ------------------------------------------------------------------------------------------------------------------------------------ 6 HD130948B STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 2076 S SEQ 6 NON-INT; PATTERN 1 see below 6 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD130948A 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A HD130948B 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K HD130948B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 1 452.0 S HD130948B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 1 452.0 S HD130948B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 1 452.0 S HD130948B 3 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 1 452.0 S HD130948B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 2 685.0 S HD130948B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 2 685.0 S HD130948B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 2 685.0 S HD130948B 4 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 2 685.0 S HD130948B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 3 685.0 S HD130948B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 3 685.0 S HD130948B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 3 685.0 S HD130948B 5 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 3 685.0 S HD130948B 6 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 1 4 684.0 S HD130948B 6 STIS/CCD ACCUM 52X0.1E1 G750M 6768 1 none none 2 4 684.0 S HD130948B 6 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 1 4 684.0 S HD130948B 6 STIS/CCD ACCUM 52X0.1E1 G750M 6768 2 none none 2 4 684.0 S 12255( 6) - 17-May-2011 11:22:33 - [ 8] Summary Form for Proposal 12255 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X0.1E1, F25ND3, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 11-OCT-2010:00:00:00 AND 26-JAN-2011:00:00:00, BETWEEN 21-APR-2012:00:00:00 AND 19-MAY-2012:00:00:00, BETWEEN 25-JUL-2011:00:00:00 AND 15-AUG-2011:00:00:00, BETWEEN 25-MAY-2011:00:00:00 AND 31-AUG-2011:00:00:00, ORIENT 167D TO 187 D, ORIENT 248D TO 268 D, ORIENT 90D TO 110 D, PATTERN 1 3, PATTERN 1 4, PATTERN 1 5, PATTERN 1 6, SEQ 1-3 NON-INT, SEQ 4 NON-INT, SEQ 5 NON-INT, SEQ 5-6 NON-INT, SEQ 6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G750M, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, GL569A, GL569B, HD130948A, HD130948B, LP349-25 ------------------------------------------------------------------------------------------------------------------------------------