15693( 3) - 23-Apr-2019 17:54:57 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15693 Version: 3 Check-in Time: 23-Apr-2019 17:54:57 STScI Edit Number: 0 Title The late-time NIR light curve of SN 2018gv ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Or Graur Harvard University Y CoI: Dr. Daniel J. Eisenstein Harvard University N CoI: Dr. Robert Fisher University of Massachusetts Dartmouth N CoI: Vishal Tiwari University of Massachusetts Dartmouth N ------------------------------------------------------------------------------------ Abstract We ask for 4 orbits of WFC3 to complete observations of the Type Ia supernova (SN Ia) 2018gv conducted by HST program GO-15145. SNe Ia have long been used to measure extragalactic distances and constrain the cosmological parameters. However, the nature of their progenitors remains elusive, which adds a systematic uncertainty to their use as standard candles. Recently, late-time observations of SNe Ia (>500 days after maximum light) have provided a new diagnostic of SN Ia progenitor, explosion, and nebular physics. Here, we ask for 4 orbits of WFC3 to complete observe SN 2018gv out to 700 days past maximum light and explore its NIR light curve. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will visit SN 2018gv four times, with a cadence of 50-100 days. In each visit, we will image the SN with one orbit, split between F350LP and F160W. For the F350LP portion, we will use the WFC3-UVIS-DITHER-LINE-3PT dithering pattern; for the F160W portion - the WFC3-IR-DITHER-LINE pattern. ------------------------------------------------------------------------------------ 15693( 3) - 23-Apr-2019 17:54:57 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-2018GV EXT-STAR, SUPERNOVA RA=08H05M34.6104S, J2000 V = 19 TYPE IA DEC=-11D26'16.30" Reference Frame: Other: NED Extended: NO Comments: This object was generated by the targetselector and retrieved from the NED database. ------------------------------------------------------------------------------------------------------------------------------------ 15693( 3) - 23-Apr-2019 17:54:57 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 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: 3 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 ------------------------------------------------------------------------------------------------------------------------------------ 15693( 3) - 23-Apr-2019 17:54:57 - [ 4] Visit: 01 (SN 2018gv +435) Visit Requirements: BETWEEN 10-APR-2019:00:00:00 AND 14-APR-2019:00:00:00 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-2018GV WFC3/UVI ACCUM UVIS1 F350LP 1 380 S PATTERN 2 1 S (1140 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2018GV WFC3/IR MULTIAC IR-UVIS F160W NSAMP=12, SAMP-SEQ=SPARS50 1 DEF PATTERN 3 2 CUM (1105.875 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-2018GV 1 WFC3/UVI ACCUM UVIS1 F350LP 1 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS1 F350LP 2 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS1 F350LP 3 none none none 1 N/A S SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 1 none none none 1 N/A CUM SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 2 none none none 1 N/A CUM 15693( 3) - 23-Apr-2019 17:54:57 - [ 5] Visit: 02 (SN 2018gv +490) Visit Requirements: ORIENT 121D TO 132 D; BETWEEN 04-JUN-2019:00:00:00 AND 08-JUN-2019:00:00:00 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-2018GV WFC3/UVI ACCUM UVIS F350LP 1 380 S POS TARG S (1140 S) 40.3622627083703, -32.89254764462549; PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2018GV WFC3/IR MULTIAC IR-UVIS F160W NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG CUM (1105.875 40.43764828574987, S) -32.799825344221695; PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 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-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 1 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 2 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 3 none none none 1 N/A S SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 1 none none none 1 N/A CUM SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 2 none none none 1 N/A CUM 15693( 3) - 23-Apr-2019 17:54:57 - [ 6] Visit: 03 (SN 2018gv +600) Visit Requirements: ORIENT 258D TO 269 D; BETWEEN 22-SEP-2019:00:00:00 AND 26-SEP-2019:00:00:00 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-2018GV WFC3/UVI ACCUM UVIS F350LP 1 380 S POS TARG S (1140 S) -34.736091978917386, -37.27656218641934; PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2018GV WFC3/IR MULTIAC IR-UVIS F160W NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG CUM (1105.875 -34.650446832694215, S) -37.356187020364246; PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 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-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 1 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 2 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 3 none none none 1 N/A S SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 1 none none none 1 N/A CUM SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 2 none none none 1 N/A CUM 15693( 3) - 23-Apr-2019 17:54:57 - [ 7] Visit: 05 (SN 2018gv +700) Visit Requirements: ORIENT 310D TO 330 D; BETWEEN 31-DEC-2019:00:00:00 AND 04-JAN-2020:00:00:00 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-2018GV WFC3/UVI ACCUM UVIS F350LP 1 380 S POS TARG S (1140 S) -26.31976002724051, 27.19944123215423; PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2018GV WFC3/IR MULTIAC IR-UVIS F160W NSAMP=12, SAMP-SEQ=SPARS50 1 DEF POS TARG CUM (1105.875 -26.382116306780237, S) 27.1389629574982; PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 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-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 1 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 2 none none none 1 N/A S SN-2018GV 1 WFC3/UVI ACCUM UVIS F350LP 3 none none none 1 N/A S SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 1 none none none 1 N/A CUM SN-2018GV 2 WFC3/IR MULTIAC IR-UVIS F160W 2 none none none 1 N/A CUM 15693( 3) - 23-Apr-2019 17:54:57 - [ 8] Summary Form for Proposal 15693 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR-UVIS, UVIS, UVIS1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 04-JUN-2019:00:00:00 AND 08-JUN-2019:00:00:00, BETWEEN 10-APR-2019:00:00:00 AND 14-APR-2019:00:00:00, BETWEEN 22-SEP-2019:00:00:00 AND 26-SEP-2019:00:00:00, BETWEEN 31-DEC-2019:00:00:00 AND 04-JAN-2020:00:00:00, ORIENT 121D TO 132 D, ORIENT 258D TO 269 D, ORIENT 310D TO 330 D, PATTERN 2 1, PATTERN 3 2, POS TARG -26.31976002724051, 27.19944123215423, POS TARG -26.382116306780237, 27.1389629574982, POS TARG -34.650446832694215, -37.356187020364246, POS TARG -34.736091978917386, -37.27656218641934, POS TARG 40.3622627083703, -32.89254764462549, POS TARG 40.43764828574987, -32.799825344221695 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F350LP ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-2018GV ------------------------------------------------------------------------------------------------------------------------------------