13428( 2) - 25-Jun-2013 12:12:08 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13428 Version: 2 Check-in Time: 25-Jun-2013 12:12:08 STScI Edit Number: 0 Title Characterizing the Ultra-cold Brown Dwarf WD 0806-661B ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Christopher R. Gelino Jet Propulsion Laboratory Y CoI: Dr. Charles A. Beichman Jet Propulsion Laboratory N CoI: Dr. J. Davy Kirkpatrick California Institute of Technology N CoI: Prof. Edward L. Wright University of California - Los Angeles N CoI: Dr. Michael C. Cushing University of Toledo N ------------------------------------------------------------------------------------ Abstract WD 0806-661B, a common proper motion companion to a white dwarf, was discovered by multi-epoch Spitzer observations. The IRAC colors and absolute magnitudes indicate that it is a brown dwarf approximately as cold as the >=Y2 dwarf WISE 1828+2650, the coldest spectroscopically confirmed brown dwarf (Teff ~300K). WD 0806-661B is too faint for spectroscopy, so we propose to characterize this object with multi-wavelength WFC3/IR observations. The photometry will not only allow us to characterize WD 0806-661B as a cold brown dwarf, it will also provide insight into the rapidly changing J-ch2, J-H, and Y-J colors exhibited by the Y dwarfs. The observations will also help bridge the gap between "normal" Y dwarfs and the enigmatic WISE 1828+2650. ------------------------------------------------------------------------------------ Observations Description ------------------------ Over 7 orbits, we will obtain observations of a single, faint point source in four WFC3/IR filters: F105W (3 orbits), F125W (1 orbit), F127M (1 orbit), and F160W (2 orbits). For each orbit, we will use the WFC3-IR-DITHER-LINE-3PT dither pattern to acquire three 1000 sec exposures (NSAMP=11, SAMP-SEQ=SPAR100). For the F160W and F105W visits, we will offset the 3-point dither pattern in the 2nd and 3rd orbits by 0.4725 arcsec with respect to the previous orbit, thereby creating 6- and 9-point dither patterns for F160W and F105W, respectively. No timing constraints have been applied to any visit in this program. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- 13428( 2) - 25-Jun-2013 12:12:08 - [ 2] ------------------------------------------------------------------------------------ 13428( 2) - 25-Jun-2013 12:12:08 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WD-0806-661B STAR, BROWN DWARF, LOW RA=08H07M15.1900S, J2000 V = 35 MASS COMPANION DEC=-66D18'51.20" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2009.6 0.056473762525469054 -0.2896 0.052 ------------------------------------------------------------------------------------------------------------------------------------ 13428( 2) - 25-Jun-2013 12:12:08 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type LINE WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER DITHER Number_Of_Points 3 3 Point_Spacing 0.4725 0.605 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 0 41.788 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type LINE WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER DITHER Number_Of_Points 2 3 Point_Spacing 0.4725 0.605 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 0 41.788 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13428( 2) - 25-Jun-2013 12:12:08 - [ 5] Visit: 01 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WD-0806-661 WFC3/IR MULTIAC IR F105W NSAMP=11, SAMP-SEQ=SPARS100 1 DEF PATTERN 1 1 B CUM (9026.42 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 1 1 none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 1 2 none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 1 3 none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 2 1 none none 2 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 2 2 none none 2 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 2 3 none none 2 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 3 1 none none 3 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 3 2 none none 3 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F105W 3 3 none none 3 N/A CUM 13428( 2) - 25-Jun-2013 12:12:08 - [ 6] Visit: 02 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WD-0806-661 WFC3/IR MULTIAC IR F125W NSAMP=11, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1 B CUM (3008.807 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-0806-661B 1 WFC3/IR MULTIAC IR F125W 1 none none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F125W 2 none none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F125W 3 none none none 1 N/A CUM 13428( 2) - 25-Jun-2013 12:12:08 - [ 7] Visit: 03 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WD-0806-661 WFC3/IR MULTIAC IR F127M NSAMP=11, SAMP-SEQ=SPARS100 1 DEF PATTERN 3 1 B CUM (3008.807 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-0806-661B 1 WFC3/IR MULTIAC IR F127M 1 none none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F127M 2 none none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F127M 3 none none none 1 N/A CUM 13428( 2) - 25-Jun-2013 12:12:08 - [ 8] Visit: 04 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| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 WD-0806-661 WFC3/IR MULTIAC IR F160W NSAMP=11, SAMP-SEQ=SPARS100 1 DEF PATTERN 2 1 B CUM (6017.613 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 | ------------------------------------------------------------------------------------------------------------------------------------ WD-0806-661B 1 WFC3/IR MULTIAC IR F160W 1 1 none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F160W 1 2 none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F160W 1 3 none none 1 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F160W 2 1 none none 2 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F160W 2 2 none none 2 N/A CUM WD-0806-661B 1 WFC3/IR MULTIAC IR F160W 2 3 none none 2 N/A CUM 13428( 2) - 25-Jun-2013 12:12:08 - [ 9] Summary Form for Proposal 13428 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=11, SAMP-SEQ=SPARS100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 1, PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F105W, F125W, F127M, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names WD-0806-661B ------------------------------------------------------------------------------------------------------------------------------------