12993( 2) - 09-Jul-2012 14:02:09 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12993 Version: 2 Check-in Time: 09-Jul-2012 14:02:09 STScI Edit Number: 0 Title The Stellar Environment of SN 2008jb: Resolving the Nature of the Progenitor ------------------------------------------------------------------------------------ Type Cycle GO 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jose Luis Prieto Princeton University Y CoI: Dr. John J. Eldridge The University of Auckland N CoI: Dr. Janice C. Lee Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Type IIP supernovae, the most common kind of core-collapse supernova (ccSN) explosions, have been associated with the deaths of red-supergiant stars with main sequence masses M = 8-15 Msun, through the direct detection of several progenitors using HST. These studies have also shown a dearth of high-mass (40 > M > 15 Msun) SN progenitor stars when compared to local populations of supergiants. However, the sample of nearby ccSNe (< 20 Mpc) used for progenitor studies is highly biased to large spiral galaxies, limiting the range of physical properties (like metallicity) that affect stellar evolution. We propose to obtain deep multi-color images with WFC3 of the birthplace of SN 2008jb to study its resolved stellar environment and constrain the age and mass of its progenitor. This ccSN was discovered by a galaxy-unbiased survey in a low-metallicity, Magellanic-type dwarf irregular galaxy at 10 Mpc. The photometric light curve properties of the event were consistent with normal Type IIP SNe; however, the explosion occurred within a large star-forming region. The approximate age of this region of ~9 Myr is more consistent with the young age and high-mass estimated for the progenitor of SN 1987A in the LMC, than with any nearby Type IIP SN. The deep optical and near-IR HST data will allow us to detect massive stars in the environment of SN 2008fb and accurately constrain the ages of the stellar populations using well-calibrated stellar evolution and population synthesis models. These data will also allow us to constrain the late-time SN energetics, dust formation in the SN ejecta or circumstellar medium, and stellar feedback from massive stars and SNe in the star-forming region. ------------------------------------------------------------------------------------ Observations Description ------------------------ We plan to use WFC3 UVIS and IR detectors for observing the birthplace stellar populations of supernova 2008jb. The main broad-band filters we will use are F336W and F606W with WFC3/UVIS, and F160W with WFC3/IR. For H-alpha imaging with UVIS we plan to use the F657N narrow-band filter. We have included all the observations requested for this program in 1 visit of 5 orbits. The exposure times required to reach the S/N necessary to characterize the stellar populations are the following: F606W: 2x500s F336W: 3x1300s F657N: 3x800s 12993( 2) - 09-Jul-2012 14:02:09 - [ 2] F160W: 2x2600s Organized as follows: Orbit1: 2x500s (F606W) and 1x1300s (F336W), aperture = UVIS2-FIX Orbit2: 2x1300s (F336W), aperture = UVIS2-FIX Orbit3: 3x800s (F657N), aperture = UVIS2-FIX Orbit4: 1x2600s (F160W), aperture = IR (SPARS200, NSTEP=14) Orbit5: 1x2600s (F160W), aperture = IR (SPARS200, NSTEP=14) The apertures are selected to fit the star-forming region around SN 2008jb (diameter = 20 arcsec) in one detector. We have chosen standard 2- and 3-point line dithering for WFC3 UVIS exposures to reject cosmic rays and reconstruct the PSF. In the IR we use the standard 2-point dither with spacing necessary to dither over detector "blobs". Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12993( 2) - 09-Jul-2012 14:02:09 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-2008JB EXT-STAR, STAR FORMING RA=03H51M44.6600S +/- 0.2", J2000 V = 25 REGION, SUPERNOVA DEC=-38D27'0.10" +/- 0.2" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 12993( 2) - 09-Jul-2012 14:02:09 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 5.183 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.859 Angle_Between_Sides Center_Pattern YES ------------------------------------------------------------------------------------------------------------------------------------ 12993( 2) - 09-Jul-2012 14:02:09 - [ 5] Visit: 01 Visit Requirements: SCHED 100% 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 SN-2008JB WFC3/UVI ACCUM UVIS2-FIX F606W 1 500 S PATTERN 1 1 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2008JB WFC3/UVI ACCUM UVIS2-FIX F336W 1 1300 S PATTERN 2 2 S see below ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-2008JB WFC3/UVI ACCUM UVIS2-FIX F657N 1 800 S PATTERN 2 3 S see below ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-2008JB WFC3/IR MULTIAC IR F160W SAMP-SEQ=SPARS200, NSAMP=14 1 DEF PATTERN 3 4 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2008JB 1 WFC3/UVI ACCUM UVIS2-FI F606W 1 none none none 1 527.0 S S X SN-2008JB 1 WFC3/UVI ACCUM UVIS2-FI F606W 2 none none none 1 527.0 S S X SN-2008JB 2 WFC3/UVI ACCUM UVIS2-FI F336W 1 none none none 1 1327.0 S S X SN-2008JB 2 WFC3/UVI ACCUM UVIS2-FI F336W 2 none none none 2 1323.0 S S X SN-2008JB 2 WFC3/UVI ACCUM UVIS2-FI F336W 3 none none none 2 1323.0 S S X SN-2008JB 3 WFC3/UVI ACCUM UVIS2-FI F657N 1 none none none 3 839.0 S S X SN-2008JB 3 WFC3/UVI ACCUM UVIS2-FI F657N 2 none none none 3 839.0 S S X SN-2008JB 3 WFC3/UVI ACCUM UVIS2-FI F657N 3 none none none 3 839.0 S S X SN-2008JB 4 WFC3/IR MULTIAC IR F160W 1 none none none 4 N/A CUM SN-2008JB 4 WFC3/IR MULTIAC IR F160W 2 none none none 5 N/A CUM 12993( 2) - 09-Jul-2012 14:02:09 - [ 6] Summary Form for Proposal 12993 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, SAMP-SEQ=SPARS200 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 2 2, PATTERN 2 3, PATTERN 3 4, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F336W, F606W, F657N ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-2008JB ------------------------------------------------------------------------------------------------------------------------------------