12559( 2) - 05-Jul-2011 13:19:41 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12559 Version: 2 Check-in Time: 05-Jul-2011 13:19:41 STScI Edit Number: 0 Title Stellar Forensics III: A post-explosion view of the progenitors of core-collapse supernovae ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Justyn R. Maund University of Copenhagen, Niels Bohr Institute CoI: Mr. Morgan Fraser The Queen's University of Belfast N CoI: Dr. Stephen J. Smartt The Queen's University of Belfast N CoI: Dr. Robert Mark Crockett University of Oxford N CoI: Dr. John J. Eldridge University of Cambridge N CoI: Dr. Seppo Mattila University of Turku N CoI: Dr. Richard Stancliffe Monash University N ------------------------------------------------------------------------------------ Abstract Recent studies have used high spatial resolution HST observations of supernova (SN) sites to directly identify the progenitors of core-collapse SNe on pre-explosion images. These studies have set constraints about the nature of massive stars and their evolution just prior to their explosion as SNe. 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 sites of two core-collapse SNe 2009kr and 2009md. We aim to: 1) Confirm our original identifications, made in pre-explosion images, by confirming that the progenitors are now missing; 2) Apply image subtraction techniques for this late-time imaging with our pre-explosion images to determine accurate photometry of the progenitors to constrain their temperatures and luminosities; and 3) study the stellar populations in the immediate vicinities of these SNe, previously obscured by the progenitor and the SN, to provide a measure of the progenitor's age, as well. HST provides the unique combination of high-resolution optical/IR imaging at very faint magnitudes that will facilitate this study. ------------------------------------------------------------------------------------ Observations Description ------------------------ We require 3 color imaging of the sites of 2 SNe (2009kr and 2009md) using ACS WFC. In order to reduce time spent on reading out, we will use the WFC 1k subarray. For each SN we will use 2 orbits to acquire deep F435W, F555W and F814W imaging (to reach magnitude limits indicated below). For each filter, we will adopt a four-point, box dither pattern for the removal of hot-pixels and cosmic rays. Tests of arranging the observations with only 4 pointing maneuvers (rather than the 16 we use) showed this pattern to be less efficient, hence we adopt 16 separate pointing maneuvers. As stated in the Phase I, the SNe need to be faint (or completely absent) in these observations - hence we require them to be scheduled in the second half 12559( 2) - 05-Jul-2011 13:19:41 - [ 2] of Cycle 19 (which we take to be after 1 Apr 2012). 2009kr - Visit 1 - 2 orbits I - 4x384s - I ~26 at 5sig B - 4x270s - B ~26 at 3sig V - 4x425s - V ~ 27 at 5sig 2009md - Visit 2 - 2 orbits I - 4x384s - I ~26 at 5sig B - 4x268s - B ~26 at 3sig V - 4x425s - V ~ 27 at 5sig Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12559( 2) - 05-Jul-2011 13:19:41 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2009KR EXT-STAR, SUPERNOVA RA=05H12M3.3000S +/- 0.1", J2000 V = 27.5 TYPE II DEC=-15D41'52.20" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2009MD EXT-STAR, SUPERNOVA RA=10H48M26.2800S +/- 0.1", J2000 V = 27.5 +/- 0.5 TYPE II DEC=+12D32'2.80" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 12559( 2) - 05-Jul-2011 13:19:41 - [ 4] 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 ------------------------------------------------------------------------------------------------------------------------------------ 12559( 2) - 05-Jul-2011 13:19:41 - [ 5] Visit: 01 Visit Requirements: AFTER 01-APR-2012 On Hold Comments: Additional Comments: Visit for SN 2009kr Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2009KR ACS/WFC ACCUM WFC1-1K F814W 1 385 S PATTERN 1 1 see below ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2009KR ACS/WFC ACCUM WFC1-1K F435W 1 270 S PATTERN 1 2 see below ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2009KR ACS/WFC ACCUM WFC1-1K F555W 1 425 S PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2009KR 1 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 384.0 S SN2009KR 1 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 384.0 S SN2009KR 1 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 1 384.0 S SN2009KR 1 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 1 384.0 S SN2009KR 2 ACS/WFC ACCUM WFC1-1K F435W 1 none none none 1 270.0 S SN2009KR 2 ACS/WFC ACCUM WFC1-1K F435W 2 none none none 1 270.0 S SN2009KR 2 ACS/WFC ACCUM WFC1-1K F435W 3 none none none 2 N/A SN2009KR 2 ACS/WFC ACCUM WFC1-1K F435W 4 none none none 2 N/A SN2009KR 3 ACS/WFC ACCUM WFC1-1K F555W 1 none none none 2 N/A SN2009KR 3 ACS/WFC ACCUM WFC1-1K F555W 2 none none none 2 N/A SN2009KR 3 ACS/WFC ACCUM WFC1-1K F555W 3 none none none 2 N/A SN2009KR 3 ACS/WFC ACCUM WFC1-1K F555W 4 none none none 2 N/A 12559( 2) - 05-Jul-2011 13:19:41 - [ 6] Visit: 02 Visit Requirements: AFTER 01-APR-2012 On Hold Comments: Additional Comments: Visit for SN 2009md Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2009MD ACS/WFC ACCUM WFC1-1K F814W 1 384 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2009MD ACS/WFC ACCUM WFC1-1K F435W 1 268 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2009MD ACS/WFC ACCUM WFC1-1K F555W 1 425 S PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2009MD 1 ACS/WFC ACCUM WFC1-1K F814W 1 none none none 1 N/A SN2009MD 1 ACS/WFC ACCUM WFC1-1K F814W 2 none none none 1 N/A SN2009MD 1 ACS/WFC ACCUM WFC1-1K F814W 3 none none none 1 N/A SN2009MD 1 ACS/WFC ACCUM WFC1-1K F814W 4 none none none 1 N/A SN2009MD 2 ACS/WFC ACCUM WFC1-1K F435W 1 none none none 1 N/A SN2009MD 2 ACS/WFC ACCUM WFC1-1K F435W 2 none none none 1 N/A SN2009MD 2 ACS/WFC ACCUM WFC1-1K F435W 3 none none none 2 N/A SN2009MD 2 ACS/WFC ACCUM WFC1-1K F435W 4 none none none 2 N/A SN2009MD 3 ACS/WFC ACCUM WFC1-1K F555W 1 none none none 2 N/A SN2009MD 3 ACS/WFC ACCUM WFC1-1K F555W 2 none none none 2 N/A SN2009MD 3 ACS/WFC ACCUM WFC1-1K F555W 3 none none none 2 N/A SN2009MD 3 ACS/WFC ACCUM WFC1-1K F555W 4 none none none 2 N/A 12559( 2) - 05-Jul-2011 13:19:41 - [ 7] Summary Form for Proposal 12559 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1-1K ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01-APR-2012, PATTERN 1 1, PATTERN 1 2, PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2009KR, SN2009MD ------------------------------------------------------------------------------------------------------------------------------------