15272( 2) - 20-Jul-2017 13:17:08 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15272 Version: 2 Check-in Time: 20-Jul-2017 13:17:08 STScI Edit Number: 0 Title The Progenitor of Supernova 2016gkg ------------------------------------------------------------------------------------ Type Cycle GO 25 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Gaston Folatelli Universidad Nacional de La Plata (UNLP) Y CoI: Dr. Schuyler D. Van Dyk California Institute of Technology N CoI: Dr. Melina C. Bersten Universidad Nacional de La Plata (UNLP) N CoI: Prof. Alex V. Filippenko University of California - Berkeley N CoI: Dr. Mario Hamuy Universidad de Chile N CoI: Dr. Hanindyo Kuncarayakti University of Turku N CoI: Prof. Keiichi Maeda Kyoto University N CoI: Prof. Ken'ichi Nomoto Institute for Physics and Mathematics of N the Universe CoI: Dr. Giuliano Pignata Universidad Andres Bello N CoI: Dr. WeiKang Zheng University of California - Berkeley N CoI: Dr. Federico Garcia Instituto Argentino de Radioastronomia N ------------------------------------------------------------------------------------ Abstract Supernova (SN) 2016gkg is called to be one of the most interesting events of its kind in the coming years. Its discovery minutes/hours after explosion, subsequent intensive monitoring from ground and space, and the existence of pre-explosion HST imaging where a progenitor candidate was detected, makes this SN an ideal case to study the fate of massive stars that explode after losing most of their outer envelopes. We propose to revisit the SN site with HST once the ejecta fade below the pre-explosion brightness in order to test the progenitor identification. This will also allow a better characterization of the progenitor object, which is crucial to confirm our proposal that it belonged to an interacting binary system. The images will have additional archival value as they will sample a large fraction of the host galaxy NGC 613. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will re-observe the site of SN 2016gkg in NGC 613 using ACS/WFC through three optical bands that most closely resemble the available pre-SN observations (i.e., F435W, F606W, and F814W) in order to determine whether the progenitor candidate has disappeared. According to our modeling, the candidate object is indeed the SN progenitor, so we expect the observed flux to be below the pre-explosion level in all bands. We expect the fading SN ejecta to be at 26 Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15272( 2) - 20-Jul-2017 13:17:08 - [ 5] Visit: 01 (Visit 1) Visit Requirements: AFTER 03-JUL-2018:00:00:00 On Hold Comments: Additional Comments: This visit contains the whole program. Two orbits that will be used to observe with ACS/WFC and filters F435W, F606W, and F814W. 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 SN2016GKG ACS/WFC ACCUM WFC F435W 1 800 S PATTERN 1 1 (1600 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2016GKG ACS/WFC ACCUM WFC F606W 1 685 S PATTERN 1 2 (1370 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2016GKG ACS/WFC ACCUM WFC F814W 1 900 S PATTERN 1 3 (1800 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2016GKG 1 ACS/WFC ACCUM WFC F435W 1 none none none 1 N/A SN2016GKG 1 ACS/WFC ACCUM WFC F435W 2 none none none 1 N/A SN2016GKG 2 ACS/WFC ACCUM WFC F606W 1 none none none 1 N/A SN2016GKG 2 ACS/WFC ACCUM WFC F606W 2 none none none 2 N/A SN2016GKG 3 ACS/WFC ACCUM WFC F814W 1 none none none 2 N/A SN2016GKG 3 ACS/WFC ACCUM WFC F814W 2 none none none 2 N/A 15272( 2) - 20-Jul-2017 13:17:08 - [ 6] Summary Form for Proposal 15272 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 03-JUL-2018:00:00:00, PATTERN 1 1, PATTERN 1 2, PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W, F606W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2016GKG ------------------------------------------------------------------------------------------------------------------------------------