13480( 2) - 26-Jun-2013 20:06:43 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13480 Version: 2 Check-in Time: 26-Jun-2013 20:06:43 STScI Edit Number: 0 Title Super-luminous supernovae without host galaxies ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andrew J. Levan The University of Warwick Y CoI: Prof. Nial R. Tanvir University of Leicester N CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Dr. Daniel Perley California Institute of Technology N CoI: Mr. Gregory Brown The University of Warwick N CoI: Ms. Rachel Tunnicliffe The University of Warwick N CoI: Prof. Boris T. Gaensicke The University of Warwick N CoI: Dr. Peter J. Wheatley The University of Warwick N CoI: Prof. Thomas R. Marsh The University of Warwick N ------------------------------------------------------------------------------------ Abstract Super-luminous supernovae (SLSNe) are a population of presumed core collapse events, whose peak luminosity is a factor up to a hundred greater than that of the majority of SNe (typically M_V < -22). Several models have been proposed for their progenitors, including an origin in the collapse of massive low metallicity stars in so called pair instability SNe, potentially making SLSNe a powerful link to the early Universe. In Cycle 20 we are undertaking a survey of SLSNe hosts in the UV and IR. Remarkably, even at the deep limits of HST, 1/3 of these SLSNe have no detected host galaxy (F336W > 26.5, corresponding to absolute magnitude limits of M_UV ~ -13 at z~0.2), and another 1/3 lie on regions within their host where there is no sign of ongoing star formation. This may suggest either that these events arise in extremely low luminosity (and possibly low metallicity) star forming galaxies, or alternatively that we need to reasses their interpretation as core collapse events. Here we propose to resolve this discrepancy, by obtaining deep observations of 3 events without host galaxies in both the optical and IR. We will place limits that are a factor of ~6-8 deeper than those currently obtained, covering even the lowest luminosity star forming dwarf galaxies known, reaching limiting absolute magnitudes of M_V ~ -11. If we locate hosts in these images it would imply an origin in low metallicty star forming systems. Alternatively, their non-detection may suggest that they do not lie on host galaxies, and instead may be an older population, not formed through a conventional core-collapse mechanism, that has moved significantly from their birth sites before the supernova. ------------------------------------------------------------------------------------ Observations Description ------------------------ The purpose of these observations is to perform a deep optical and IR search for emission at the location of a sample of superluminous SNe whose host galaxies appear to be extremely underluminous. We will obtain these observations by taking two orbits of ACS/F606W data, utilizing a 4-point dither and placing the target at the WFC1-CTE aperture to 13480( 2) - 26-Jun-2013 20:06:43 - [ 2] mitigate against any CTE losses. We will complement these data by observing a single orbit with WFC3/IR, again using a 4-point dither. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13480( 2) - 26-Jun-2013 20:06:43 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2008ES GALAXY, HIGH REDSHIFT RA=11H56M49.1300S, J2000 V = 28 +/- 1 GALAXY DEC=+54D27'25.70" Reference Frame: Other: SDSS ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2008FZ GALAXY, HIGH REDSHIFT RA=23H16M16.6000S, J2000 V = 28 GALAXY DEC=+11D42'47.50" Reference Frame: Other: SDSS ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2009JH GALAXY, HIGH REDSHIFT RA=14H49M10.0900S, J2000 V = 28 +/- 1 GALAXY DEC=+29D25'10.40" Reference Frame: Other: SDSS ------------------------------------------------------------------------------------------------------------------------------------ 13480( 2) - 26-Jun-2013 20:06:43 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13480( 2) - 26-Jun-2013 20:06:43 - [ 5] Visit: H1 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 SN2009JH ACS/WFC ACCUM WFC1-CTE F606W 1 900 S PATTERN 1 1 see below (5276 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2009JH 1 ACS/WFC ACCUM WFC1-CTE F606W 1 none none none 1 1271.0 S SN2009JH 1 ACS/WFC ACCUM WFC1-CTE F606W 2 none none none 1 1271.0 S SN2009JH 1 ACS/WFC ACCUM WFC1-CTE F606W 3 none none none 2 1367.0 S SN2009JH 1 ACS/WFC ACCUM WFC1-CTE F606W 4 none none none 2 1367.0 S 13480( 2) - 26-Jun-2013 20:06:43 - [ 6] Visit: H2 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 SN2009JH WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 2 1 CUM (2611.753 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2009JH 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM SN2009JH 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM SN2009JH 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM SN2009JH 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 13480( 2) - 26-Jun-2013 20:06:43 - [ 7] Visit: S1 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 SN2008ES ACS/WFC ACCUM WFC1-CTE F606W 1 900 S PATTERN 1 1 see below (5630 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2008ES 1 ACS/WFC ACCUM WFC1-CTE F606W 1 none none none 1 1359.0 S SN2008ES 1 ACS/WFC ACCUM WFC1-CTE F606W 2 none none none 1 1359.0 S SN2008ES 1 ACS/WFC ACCUM WFC1-CTE F606W 3 none none none 2 1456.0 S SN2008ES 1 ACS/WFC ACCUM WFC1-CTE F606W 4 none none none 2 1456.0 S 13480( 2) - 26-Jun-2013 20:06:43 - [ 8] Visit: S2 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 SN2008ES WFC3/IR MULTIAC IR F160W NSAMP=15, SAMP-SEQ=SPARS50 1 DEF PATTERN 2 1 CUM (2811.754 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2008ES 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM SN2008ES 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM SN2008ES 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM SN2008ES 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 13480( 2) - 26-Jun-2013 20:06:43 - [ 9] Visit: Z1 Visit Requirements: ORIENT 67D TO 137 D; ORIENT 157D TO 227 D; ORIENT 247D TO 317 D; ORIENT 337D TO 47 D 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 SN2008FZ ACS/WFC ACCUM WFC1-CTE F606W 1 900 S PATTERN 1 1 see below (5236 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2008FZ 1 ACS/WFC ACCUM WFC1-CTE F606W 1 none none none 1 1261.0 S SN2008FZ 1 ACS/WFC ACCUM WFC1-CTE F606W 2 none none none 1 1261.0 S SN2008FZ 1 ACS/WFC ACCUM WFC1-CTE F606W 3 none none none 2 1357.0 S SN2008FZ 1 ACS/WFC ACCUM WFC1-CTE F606W 4 none none none 2 1357.0 S 13480( 2) - 26-Jun-2013 20:06:43 - [ 10] Visit: Z2 Visit Requirements: ORIENT 67D TO 137 D; ORIENT 157D TO 227 D; ORIENT 247D TO 317 D; ORIENT 337D TO 47 D 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 SN2008FZ WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 2 1 CUM (2611.753 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2008FZ 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM SN2008FZ 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM SN2008FZ 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM SN2008FZ 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 13480( 2) - 26-Jun-2013 20:06:43 - [ 11] Summary Form for Proposal 13480 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, WFC1-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=14, NSAMP=15, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 157D TO 227 D, ORIENT 247D TO 317 D, ORIENT 337D TO 47 D, ORIENT 67D TO 137 D, PATTERN 1 1, PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2008ES, SN2008FZ, SN2009JH ------------------------------------------------------------------------------------------------------------------------------------