13477( 2) - 11-Jun-2013 13:54:12 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13477 Version: 2 Check-in Time: 11-Jun-2013 13:54:12 STScI Edit Number: 0 Title Unmasking the Supernova Impostors ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. C. S. Kochanek The Ohio State University Y CoI: Dr. Krzysztof Z. Stanek The Ohio State University N ------------------------------------------------------------------------------------ Abstract We propose measuring the optical/near-IR/mid-IR spectral energy distributions of the three nearby ``supernova impostors'' SN1954J, SN1961V and SN1997bs. All three have candidate surviving stars which, in order to explain their faintness, are believed to be shrouded by dusty shells formed during the eruption. If this hypothesis is correct, we will be able to estimate the mass lost in the eruption, a key step towards understanding the physics of eruptions and their role in the evolution of massive stars. In the case of SN~1961V, however, the most likely outcome is to conclusively show that the standard hypothesis is wrong and that the transient was a true supernova. This outcome is less likely for the other two targets, but it would be revolutionary and is not disallowed by the existing fragmentary data. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal is to obtain two optical (either F475W or F555W plus F814W) and two IR (F110W and F160W) WFC3 images of three "supernova impostors" in order to try to measure the SED of any surviving star on a long enough wavelength baseline to simultaneously estimate the stellar temperature, luminosity and extinction by circumstellar dust. Spitzer observations will be used to measure emission by the circumstellar dust. The blue WFC3/UVIS filter is picked to best match the available archival filters to optimize the ability to detect changes. For UVIS, observing filter 1 at all dither points followed by filter 2 at all dither points produced slightly higher total integration times than interleaving the filters. There are 50 unused seconds in visit 03 WFC3/IR for which there was no efficient filler given the quantization of the WFC3/IR observing modes. However, mixing the optical/IR filters in each orbit (where auto-adjust on the 13477( 2) - 11-Jun-2013 13:54:12 - [ 2] optical would fill the time) seems to consistently produce slightly less total integration time. While no constraints were requested, the archival value of the data would be maximized by shifting between the UVIS1 and UVIS2 pointing centers to put more of the chip real estate on the host galaxy of these sources given the orientation at the time of the observations. This would have no effect on the primary science. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13477( 2) - 11-Jun-2013 13:54:12 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-1954J EXT-STAR, LUMINOUS BLUE RA=07H36M55.3600S, J2000 V = 23 VARIABLE, SUPERNOVA DEC=+65D37'52.10" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1961V EXT-STAR, LUMINOUS BLUE RA=02H43M36.4200S, J2000 V = 24 VARIABLE, SUPERNOVA DEC=+37D20'43.60" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1997BS EXT-STAR, LUMINOUS BLUE RA=11H20M14.2500S, J2000 V = 26 VARIABLE, SUPERNOVA DEC=+12D58'19.60" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 13477( 2) - 11-Jun-2013 13:54:12 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13477( 2) - 11-Jun-2013 13:54:12 - [ 5] Visit: 01 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 SN-1954J WFC3/UVI ACCUM UVIS1 F475W 1 400 S PATTERN 1 1 S see below (1290 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1954J WFC3/UVI ACCUM UVIS1 F814W 1 400 S PATTERN 1 2 S see below (1290 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1954J WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP100 1 DEF PATTERN 2 3-5 CUM (1398.465 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-1954J WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=STEP100 1 DEF CUM (1598.466 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-1954J WFC3/IR MULTIAC IR F110W NSAMP=6, SAMP-SEQ=STEP25 1 DEF (98.46 CUM 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-1954J 1 WFC3/UVI ACCUM UVIS1 F475W 1 none none none 1 430.0 S S SN-1954J 1 WFC3/UVI ACCUM UVIS1 F475W 2 none none none 1 430.0 S S SN-1954J 1 WFC3/UVI ACCUM UVIS1 F475W 3 none none none 1 430.0 S S SN-1954J 2 WFC3/UVI ACCUM UVIS1 F814W 1 none none none 1 430.0 S S SN-1954J 2 WFC3/UVI ACCUM UVIS1 F814W 2 none none none 1 430.0 S S SN-1954J 2 WFC3/UVI ACCUM UVIS1 F814W 3 none none none 1 430.0 S S SN-1954J 3 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A CUM SN-1954J 3 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A CUM 13477( 2) - 11-Jun-2013 13:54:12 - [ 6] 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-1954J 4 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-1954J 4 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-1954J 5 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A CUM SN-1954J 5 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A CUM 13477( 2) - 11-Jun-2013 13:54:12 - [ 7] Visit: 02 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 SN-1961V WFC3/UVI ACCUM UVIS1 F475W 1 400 S PATTERN 1 1 S see below (1143 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1961V WFC3/UVI ACCUM UVIS1 F814W 1 400 S PATTERN 1 2 S see below (1143 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1961V WFC3/IR MULTIAC IR F110W NSAMP=11, SAMP-SEQ=STEP100 1 DEF PATTERN 2 3-5 CUM (998.464 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-1961V WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=STEP100 1 DEF CUM (1598.466 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-1961V WFC3/IR MULTIAC IR F110W NSAMP=8, SAMP-SEQ=STEP25 1 DEF CUM (198.463 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-1961V 1 WFC3/UVI ACCUM UVIS1 F475W 1 none none none 1 381.0 S S SN-1961V 1 WFC3/UVI ACCUM UVIS1 F475W 2 none none none 1 381.0 S S SN-1961V 1 WFC3/UVI ACCUM UVIS1 F475W 3 none none none 1 381.0 S S SN-1961V 2 WFC3/UVI ACCUM UVIS1 F814W 1 none none none 1 381.0 S S SN-1961V 2 WFC3/UVI ACCUM UVIS1 F814W 2 none none none 1 381.0 S S SN-1961V 2 WFC3/UVI ACCUM UVIS1 F814W 3 none none none 1 381.0 S S SN-1961V 3 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A CUM SN-1961V 3 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A CUM 13477( 2) - 11-Jun-2013 13:54:12 - [ 8] 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-1961V 4 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-1961V 4 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM SN-1961V 5 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A CUM SN-1961V 5 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A CUM 13477( 2) - 11-Jun-2013 13:54:12 - [ 9] Visit: 03 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 SN-1997BS WFC3/UVI ACCUM UVIS1 F555W 1 400 S PATTERN 1 1 S see below (1119 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1997BS WFC3/UVI ACCUM UVIS1 F814W 1 400 S PATTERN 1 2 S see below (1119 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1997BS WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP100 1 DEF PATTERN 2 3-4 CUM (1198.465 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-1997BS WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=STEP100 1 DEF CUM (1598.466 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-1997BS 1 WFC3/UVI ACCUM UVIS1 F555W 1 none none none 1 373.0 S S SN-1997BS 1 WFC3/UVI ACCUM UVIS1 F555W 2 none none none 1 373.0 S S SN-1997BS 1 WFC3/UVI ACCUM UVIS1 F555W 3 none none none 1 373.0 S S SN-1997BS 2 WFC3/UVI ACCUM UVIS1 F814W 1 none none none 1 373.0 S S SN-1997BS 2 WFC3/UVI ACCUM UVIS1 F814W 2 none none none 1 373.0 S S SN-1997BS 2 WFC3/UVI ACCUM UVIS1 F814W 3 none none none 1 373.0 S S SN-1997BS 3 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A CUM SN-1997BS 3 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A CUM SN-1997BS 4 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM SN-1997BS 4 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM 13477( 2) - 11-Jun-2013 13:54:12 - [ 10] Summary Form for Proposal 13477 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=11, NSAMP=12, NSAMP=13, NSAMP=14, NSAMP=6, NSAMP=8, SAMP-SEQ=STEP100, SAMP-SEQ=STEP25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 2 3-4, PATTERN 2 3-5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F475W, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-1954J, SN-1961V, SN-1997BS ------------------------------------------------------------------------------------------------------------------------------------