14266( 3) - 27-Aug-2015 18:28:32 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14266 Version: 3 Check-in Time: 27-Aug-2015 18:28:32 STScI Edit Number: 0 Title Confirming NGC6946 BH1 - A Black Hole Formed in a Failed Supernova ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. C. S. Kochanek The Ohio State University Y CoI: Mr. Scott Adams The Ohio State University N CoI: Dr. Krzysztof Z. Stanek The Ohio State University N ------------------------------------------------------------------------------------ Abstract There are good observational and theoretical reasons to believe that 10-30% of the core-collapses of massive stars lead to the formation of black holes without a supernova explosion. We have been carrying out the first observational search for such failed supernovae using the Large Binocular Telescope. From the first four years of the survey, we are left with one good candidate, NGC6946 BH1. Deep HST and SST observations are needed to better constrain the vanishing of this massive star than is possible from the ground. Confirmation of the formation of a black hole in a failed supernova would represent one of the most exciting results by HST both scientifically and for the public. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal is to obtain two optical (F606W and F814W) and two IR (F110W and F160W) WFC3 images of a candidate failed supernova, where a massive star has undergone core collapse to form a black hole without an external supernova explosion. The optical filters are chosen to match the archival data available for the source prior to the event. 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 optical would fill the time) seems to consistently produce slightly less total integration time. There is not strong need to coordinate the HST and Spitzer observations. Any evolution should be slow enough at this point to remove the need for adding a constraint. 14266( 3) - 27-Aug-2015 18:28:32 - [ 2] ------------------------------------------------------------------------------------ 14266( 3) - 27-Aug-2015 18:28:32 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 NGC6946BH1 STAR, ACCRETION DISK RA=20H35M27.5600S, J2000 V = 25 DEC=+60D08'8.29" Reference Frame: Other: J2000 ------------------------------------------------------------------------------------------------------------------------------------ 14266( 3) - 27-Aug-2015 18:28:32 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 14266( 3) - 27-Aug-2015 18:28:32 - [ 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 NGC6946BH1 WFC3/UVI ACCUM UVIS1 F606W 1 400 S PATTERN 1 1 S see below (1233 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NGC6946BH1 WFC3/UVI ACCUM UVIS1 F814W FLASH=2 1 400 S PATTERN 1 2 S see below (1233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 NGC6946BH1 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF PATTERN 2 3-5 CUM (798.467 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 NGC6946BH1 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP100 1 DEF CUM (1398.465 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 NGC6946BH1 WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=STEP50 1 DEF CUM (798.467 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6946BH1 1 WFC3/UVI ACCUM UVIS1 F606W 1 none none none 1 411.0 S S NGC6946BH1 1 WFC3/UVI ACCUM UVIS1 F606W 2 none none none 1 411.0 S S NGC6946BH1 1 WFC3/UVI ACCUM UVIS1 F606W 3 none none none 1 411.0 S S NGC6946BH1 2 WFC3/UVI ACCUM UVIS1 F814W 1 none none none 1 411.0 S S NGC6946BH1 2 WFC3/UVI ACCUM UVIS1 F814W 2 none none none 1 411.0 S S NGC6946BH1 2 WFC3/UVI ACCUM UVIS1 F814W 3 none none none 1 411.0 S S NGC6946BH1 3 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM NGC6946BH1 3 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM 14266( 3) - 27-Aug-2015 18:28:32 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ NGC6946BH1 4 WFC3/IR MULTIAC IR F110W 1 none none none 2 N/A CUM NGC6946BH1 4 WFC3/IR MULTIAC IR F110W 2 none none none 2 N/A CUM NGC6946BH1 5 WFC3/IR MULTIAC IR F160W 1 none none none 2 N/A CUM NGC6946BH1 5 WFC3/IR MULTIAC IR F160W 2 none none none 2 N/A CUM 14266( 3) - 27-Aug-2015 18:28:32 - [ 7] Summary Form for Proposal 14266 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=2, NSAMP=13, SAMP-SEQ=STEP100, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 2 3-5 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names NGC6946BH1 ------------------------------------------------------------------------------------------------------------------------------------