Assigned ID: 678 ----- Attempting Submission 1 (Fri Feb 24 20:40:34 GMT 2012) ----- ----- Attempting Submission 1 (Mon Jul 09 13:23:29 GMT 2012) ----- The Stellar Environment of SN 2008jb: Resolving the Nature of the Progenitor 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. 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 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". RESOLVED STELLAR POPULATIONS 12 false 0.0 0.0 false false false false SUPPORTED EXT-STAR STAR FORMING REGION SUPERNOVA This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F657N WFC3/IR Imaging No No F160W POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 1 false POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 2 false POS-TARG DITHER DITHER 4 5.183 WFC3-IR-DITHER-BOX-MIN false 74.653 true 0.365 0.572 2 41.859 POS-TARG WFC3-IR-DITHER-BLOB 18.528 3 false /Users/jprieto/Desktop/OP-cache/phaseII-v01.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. 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