14051( 2) - 29-Jan-2015 21:03:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14051 Version: 2 Check-in Time: 29-Jan-2015 21:03:42 STScI Edit Number: 0 Title Constraining Dust Hazes at the L/T Transition via Variability ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jacqueline Radigan Space Telescope Science Institute Y CoI: Prof. Daniel Apai University of Arizona N CoI: Dr. Hao Yang University of Arizona N CoI: Kay Hiranaka American Museum of Natural History N CoI: Prof. Kelle L. Cruz City University of New York Hunter College N CoI: Dr. Esther Buenzli Max-Planck-Institut fur Astronomie, N Heidelberg CoI: Dr. Mark S. Marley NASA Ames Research Center N ------------------------------------------------------------------------------------ Abstract The T2 dwarf SIMP 1629+03 is a variable L/T transition dwarf, with a normal near-infrared spectrum. However, it is remarkable in that the wavelength dependence of its variability differs markedly from that of other L/T transition brown dwarfs. In particular, the absence of a water absorption feature in its variability spectrum indicates that a patchy, high-altitude haze, rather than a deeper cloud layer is responsible for the observed variations. We propose to obtain Spitzer+HST observations of SIMP1629+02 over two consecutive rotations periods in order to simultaneously map it's spectral variability across 1-5 um. The wide wavelength coverage will provide a suitable lever-arm for constraining the particle size distribution in the haze. A truly flat spectrum across this wavelength range would indicate large particle sizes in comparison to those inferred for red L-dwarf hazes, and would therefore provide direct evidence of grain growth with decreasing effective temperature and/or a grain-size dependence on surface gravity in brown dwarf atmospheres. ------------------------------------------------------------------------------------ Observations Description ------------------------ ORIENTATION REQUIREMENTS: We require that the spectral traces of our targets do not overlap with those of other stars in the field. Orientation constraints were calculated as follows: PA=absolute position angle between target and background star d= distance between target and background star ORIENT = position angle of HST U3 axis A_WFC3 = angle of WFC3 "-x" axis wrt HST = -45 deg PA_WFC3 = PA - ORIENT - A_WFC3 = position angle between target and background star wrt WFC3 detector -x axis. dY = absolute distance between spectral traces, perpedicular to the direction of dispersion We have required that dy > 2 arcseconds, where dY=d * cos(PA_WFC3) for stars 14051( 2) - 29-Jan-2015 21:03:42 - [ 2] along the negative x-axis with d>18". For d< 18" constraints have been place in the -ve and +ve directions. In some cases an extra buffer of up to +/- 5 deg was added due to uncertainties in source and background star proper motions. TARGETS Our target is a brown dwarf (bright in the IR), and does not appear in optical images using the target confirmation tool. It also has significant proper motion, which has been provided. ------------------------------------------------------------------------------------ 14051( 2) - 29-Jan-2015 21:03:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J16291 STAR, BROWN DWARF, T RA=16H29M18.4090S, J2000 J=15.3 840+0335371 DEC=+03D35'37.10" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000.44 0.016231916924935298 -0.158 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 14051( 2) - 29-Jan-2015 21:03:42 - [ 4] Visit: 01 Visit Requirements: ORIENT 0D TO 14 D; ORIENT 218D TO 290 D; ORIENT 326D TO 359 D; ORIENT 38D TO 110 D; ORIENT 146D TO 194 D On Hold Comments: Additional Comments: Continuous observation of 2MASS-J16291840+0335371 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 2MASS-J1629 WFC3/IR MULTIAC GRISM256 F127M NSAMP=2, SAMP-SEQ=SPARS10 2 DEF 1840+033537 CUM (15.249 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J1629 WFC3/IR MULTIAC GRISM256 G141 NSAMP=6, SAMP-SEQ=SPARS25 20 DEF 1840+033537 CUM (2240.16 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J1629 WFC3/IR MULTIAC GRISM256 F127M NSAMP=2, SAMP-SEQ=SPARS10 2 DEF 1840+033537 CUM (15.249 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J1629 WFC3/IR MULTIAC GRISM256 G141 NSAMP=6, SAMP-SEQ=SPARS25 20 DEF 1840+033537 CUM (2240.16 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 2MASS-J1629 WFC3/IR MULTIAC GRISM256 F127M NSAMP=2, SAMP-SEQ=SPARS10 1 DEF (7.624 1840+033537 CUM S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 6 2MASS-J1629 WFC3/IR MULTIAC GRISM256 G141 NSAMP=6, SAMP-SEQ=SPARS25 20 DEF 1840+033537 CUM (2240.16 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 2MASS-J1629 WFC3/IR MULTIAC GRISM256 F127M NSAMP=2, SAMP-SEQ=SPARS10 2 DEF 1840+033537 CUM (15.249 S) 1 ------------------------------------------------------------------------------------------------------------------------------------ 8 2MASS-J1629 WFC3/IR MULTIAC GRISM256 G141 NSAMP=6, SAMP-SEQ=SPARS25 20 DEF 1840+033537 CUM (2240.16 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16291840+033 1 WFC3/IR MULTIAC GRISM256 F127M none none 1 none 1 N/A 5371 CUM 14051( 2) - 29-Jan-2015 21:03:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16291840+033 1 WFC3/IR MULTIAC GRISM256 F127M none none 2 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 4 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 5 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 6 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 7 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 8 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 9 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 10 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 11 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 12 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 13 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 14 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 15 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 16 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 17 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 18 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 19 none 1 N/A 5371 CUM 2MASS-J16291840+033 2 WFC3/IR MULTIAC GRISM256 G141 none none 20 none 1 N/A 5371 CUM 2MASS-J16291840+033 3 WFC3/IR MULTIAC GRISM256 F127M none none 1 none 2 N/A 5371 CUM 2MASS-J16291840+033 3 WFC3/IR MULTIAC GRISM256 F127M none none 2 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 2 N/A 5371 CUM 14051( 2) - 29-Jan-2015 21:03:42 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 4 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 5 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 6 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 7 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 8 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 9 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 10 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 11 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 12 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 13 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 14 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 15 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 16 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 17 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 18 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 19 none 2 N/A 5371 CUM 2MASS-J16291840+033 4 WFC3/IR MULTIAC GRISM256 G141 none none 20 none 2 N/A 5371 CUM 2MASS-J16291840+033 5 WFC3/IR MULTIAC GRISM256 F127M none none none none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 4 none 3 N/A 5371 CUM 14051( 2) - 29-Jan-2015 21:03:42 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 5 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 6 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 7 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 8 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 9 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 10 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 11 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 12 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 13 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 14 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 15 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 16 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 17 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 18 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 19 none 3 N/A 5371 CUM 2MASS-J16291840+033 6 WFC3/IR MULTIAC GRISM256 G141 none none 20 none 3 N/A 5371 CUM 2MASS-J16291840+033 7 WFC3/IR MULTIAC GRISM256 F127M none none 1 none 3 N/A 5371 CUM 2MASS-J16291840+033 7 WFC3/IR MULTIAC GRISM256 F127M none none 2 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 4 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 5 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 6 none 4 N/A 5371 CUM 14051( 2) - 29-Jan-2015 21:03:42 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 7 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 8 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 9 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 10 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 11 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 12 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 13 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 14 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 15 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 16 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 17 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 18 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 19 none 4 N/A 5371 CUM 2MASS-J16291840+033 8 WFC3/IR MULTIAC GRISM256 G141 none none 20 none 4 N/A 5371 CUM 14051( 2) - 29-Jan-2015 21:03:42 - [ 9] Summary Form for Proposal 14051 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM256 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=2, NSAMP=6, SAMP-SEQ=SPARS10, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 0D TO 14 D, ORIENT 146D TO 194 D, ORIENT 218D TO 290 D, ORIENT 326D TO 359 D, ORIENT 38D TO 110 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F127M, G141 ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASS-J16291840+0335371 ------------------------------------------------------------------------------------------------------------------------------------