13825( 4) - 06-Oct-2014 13:57:31 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13825 Version: 4 Check-in Time: 06-Oct-2014 13:57:31 STScI Edit Number: 0 Title Stellar Forensics VI: A post-explosion view of the progenitor of SN 2012aw ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Justyn Maund The Queen's University of Belfast Y CoI: Dr. Morgan Fraser University of Cambridge N CoI: Dr. John J. Eldridge The University of Auckland N CoI: Dr. Seppo Mattila University of Turku N CoI: Ms. Emma Reilly The Queen's University of Belfast N CoI: Dr. Richard Stancliffe Universitat Bonn, Argelander Institute for N Astronomy ------------------------------------------------------------------------------------ Abstract Recent studies have used high spatial resolution HST observations of supernova (SN) sites to directly identify the progenitors of core-collapse SNe in pre-explosion images. These studies have set constraints about the nature of massive stars and their evolution just prior to explosion. Now, at late-times when the SNe have faded sufficiently, it is possible to return to the sites of these core-collapse SNe to search for clues about the nature of their progenitors. We request time to conduct deep, late-time, high-resolution imaging with ACS/WFC of the site of the core-collapse SN 2012aw. We aim to: 1) Confirm our original identification, made in pre-explosion images, by confirming that the progenitor is now missing; 2) Apply image subtraction techniques for this late-time imaging with our pre-explosion images to determine accurate photometry of the progenitor to constrain the temperature and luminosity. HST provides the unique combination of high-resolution optical imaging at very faint magnitudes that will facilitate this study. ------------------------------------------------------------------------------------ Observations Description ------------------------ We aim to acquire deep ACS/WFC F555W and F814W imaging observations of the site of SN 2012aw. The observations adopt a box dither pattern to improve PSF sampling, as well as enable the rejection of CRs and hot pixels. We place a loose constraint that the observations be acquired after March 2015 - to ensure that the SN has faded sufficiently for our science goals. CALIBRATION ORBITS: As per STScI policy, 2 internal orbits have been added to this proposal for the purpose of obtaining subarray bias frames that are contemporaneous with the science observations. These internal orbits will be charged to STScI's Cycle 22 ACS Calibration Program. The ACS Instrument Team at STScI is responsible for producing superbias reference files from the bias frames obtained in this GO proposal. ------------------------------------------------------------------------------------ 13825( 4) - 06-Oct-2014 13:57:31 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-2012AW EXT-STAR, SUPERNOVA RA=10H43M53.7600S, J2000 V = 25 TYPE II DEC=+11D40'17.90" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13825( 4) - 06-Oct-2014 13:57:31 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13825( 4) - 06-Oct-2014 13:57:31 - [ 4] Visit: 01 Visit Requirements: AFTER 16-MAR-2015:00:00:00; GROUP 01, A1, A2 WITHIN 14D 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 SN-2012AW ACS/WFC ACCUM WFC1-1K F555W 1 817 S PATTERN 1 1 (3268 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2012AW ACS/WFC ACCUM WFC1-1K F814W 1 384 S PATTERN 1 2 (1536 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN-2012AW 1 ACS/WFC ACCUM WFC1-1K F555W 1 none none none 1 N/A SN-2012AW 1 ACS/WFC ACCUM WFC1-1K F555W 2 none none none 1 N/A SN-2012AW 1 ACS/WFC ACCUM WFC1-1K F555W 3 none none none 1 N/A SN-2012AW 1 ACS/WFC ACCUM WFC1-1K F555W 4 none none none 2 N/A SN-2012AW 2 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 2 N/A SN-2012AW 2 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 2 N/A SN-2012AW 2 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 2 N/A SN-2012AW 2 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 2 N/A 13825( 4) - 06-Oct-2014 13:57:31 - [ 5] Visit: A1 Visit Requirements: SEQ A1, A2 WITHIN 1 D On Hold Comments: Additional Comments: This orbit is charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 BIAS ACS/WFC ACCUM WFC1-1K DEF GAIN=2.0, COMPRESSION=NONE 13 0 S (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 6 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 7 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 8 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 9 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 10 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 11 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 12 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 13 none 1 N/A 13825( 4) - 06-Oct-2014 13:57:31 - [ 6] Visit: A2 Visit Requirements: On Hold Comments: Additional Comments: This orbit is charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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 BIAS ACS/WFC ACCUM WFC1-1K DEF GAIN=2.0, COMPRESSION=NONE 13 0 S (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 1 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 2 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 3 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 4 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 5 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 6 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 7 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 8 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 9 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 10 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 11 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 12 none 1 N/A BIAS 1 ACS/WFC ACCUM WFC1-1K DEF none none 13 none 1 N/A 13825( 4) - 06-Oct-2014 13:57:31 - [ 7] Summary Form for Proposal 13825 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-1K ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters COMPRESSION=NONE, GAIN=2.0 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 16-MAR-2015:00:00:00, GROUP 01, A1, A2 WITHIN 14D, PATTERN 1 1, PATTERN 1 2, SEQ A1, A2 WITHIN 1 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, SN-2012AW ------------------------------------------------------------------------------------------------------------------------------------