15691( 6) - 13-Nov-2019 18:46:45 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15691 Version: 6 Check-in Time: 13-Nov-2019 18:46:45 STScI Edit Number: 5 Title The Progenitor of Supernova 2017ein ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Charles Kilpatrick University of California - Santa Cruz Y CoI: Prof. Ryan Foley University of California - Santa Cruz N ------------------------------------------------------------------------------------ Abstract Supernova (SN) 2017ein is the first Type Ic supernova with a credible progenitor candidate. This unprecedented discovery has the potential to revolutionize the study of core-collapse SNe by directly tying a stripped-envelope SN to a progenitor system with well-measured properties. However, follow up is necessary to robustly test the association between SN 2017ein and its progenitor candidate. We propose to revisit the site of SN 2017ein with HST once the SN has faded below the pre-explosion brightness. This observation will provide an unambiguous test of the association between the SN and progenitor candidate and better characterization of its pre-explosion properties. These images will also have archival value by provide an additional epoch of optical imaging covering the host galaxy NGC 3938. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to observe the site of supernova 2017ein in cycle 26 with the Wide Field Camera 3 (WFC3) UV/visible (UVIS) detecting CCD in F555W and F814W. The filters were chosen to match pre-explosion imaging of the site of this supernova where a counterpart was detected in WFPC2 F555W and F814W imaging from 2005. Based on light curves of the supernova from 2017 and 2018, we expect the source to be 26 mag in F555W and F814W, which is fainter than the pre-explosion magnitudes of the counterpart. Due to the fact that the supernova is still fading, we would prefer a later execution date so that it is as faint as possible in the proposed imaging. Taking into account the visibility window per orbit and the time needed for guide star acquisition, dithering, and exposure overheads, the total effective exposure time per orbit is 2500 s. We would therefore expect to detect any source at the location of supernova 2017ein with S/N > 20 in F555W and > 10 in F814W. ------------------------------------------------------------------------------------ 15691( 6) - 13-Nov-2019 18:46:45 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2017EIN EXT-STAR, SUPERNOVA RA=11H52M53.2500S, J2000 V = 26 DEC=+44D07'26.20" Reference Frame: ICRS Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 15691( 6) - 13-Nov-2019 18:46:45 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15691( 6) - 13-Nov-2019 18:46:45 - [ 4] 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 SN2017EIN WFC3/UVI ACCUM UVIS2-C1K F555W 1 600 S PATTERN 1 1 S 1C-CTE (2513 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2017EIN WFC3/UVI ACCUM UVIS2-C1K F814W 1 600 S PATTERN 1 2 S 1C-CTE see below (2544 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 N/A S K1C-CTE SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 713.0 S S K1C-CTE SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 N/A S K1C-CTE SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 N/A S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 1 none none none 2 636.0 S S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 2 none none none 2 636.0 S S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 3 none none none 2 636.0 S S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 4 none none none 2 636.0 S S K1C-CTE 15691( 6) - 13-Nov-2019 18:46:45 - [ 5] Visit: H1 (HOPR of failed 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 SN2017EIN WFC3/UVI ACCUM UVIS2-C1K F555W 1 600 S PATTERN 1 1 S 1C-CTE (2513 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2017EIN WFC3/UVI ACCUM UVIS2-C1K F814W 1 600 S PATTERN 1 2 S 1C-CTE see below (2544 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 1 none none none 1 N/A S K1C-CTE SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 2 none none none 1 713.0 S S K1C-CTE SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 3 none none none 1 N/A S K1C-CTE SN2017EIN 1 WFC3/UVI ACCUM UVIS2-C1 F555W 4 none none none 1 N/A S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 1 none none none 2 636.0 S S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 2 none none none 2 636.0 S S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 3 none none none 2 636.0 S S K1C-CTE SN2017EIN 2 WFC3/UVI ACCUM UVIS2-C1 F814W 4 none none none 2 636.0 S S K1C-CTE 15691( 6) - 13-Nov-2019 18:46:45 - [ 6] Summary Form for Proposal 15691 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-C1K1C-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2017EIN ------------------------------------------------------------------------------------------------------------------------------------