17253( 3) - 18-Oct-2022 21:00:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17253 Version: 3 Check-in Time: 18-Oct-2022 21:00:15 STScI Edit Number: 0 Title Imaging and Spectroscopy of Three Highly Magnified Images of a Supernova at z=1.5 ------------------------------------------------------------------------------------ Type Cycle GO/DD 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Patrick Kelly University of Minnesota - Twin Cities Y CoI: Dr. Louis-Gregory Strolger Space Telescope Science Institute N CoI: Dr. Justin Pierel Space Telescope Science Institute N CoI: Dr. Anton M. Koekemoer Space Telescope Science Institute N CoI: Prof. Tommaso L. Treu University of California - Los Angeles N CoI: Prof. Ryan Foley University of California - Santa Cruz N CoI: Prof. Masamune Oguri Chiba University N CoI: Dr. Wenlei Chen University of Minnesota - Twin Cities N CoI: Ms. Hayley Madeleine Williams University of Minnesota - Twin Cities N CoI: Prof. Thomas J. Broadhurst University of the Basque Country N CoI: Dr. Saurabh W. Jha Rutgers the State University of New Jersey N CoI: Prof. Jens Hjorth University of Copenhagen, Niels Bohr N Institute CoI: Dr. Ismael Perez-Fournon Instituto de Astrofisica de Canarias N CoI: Dr. Frederick Poidevin Instituto de Astrofisica de Canarias N CoI: Prof. Xiaosheng Huang University of San Francisco N CoI: Prof. Alex V. Filippenko University of California - Berkeley N ------------------------------------------------------------------------------------ Abstract We have detected a strongly lensed supernova (SN) in HST imaging of the RX J2129 galaxy-cluster field acquired on August 7, 2022. The SN's apparent F110W magnitude of 24.70+-0.15 and a non-detection in F606W yield an 80% probability that the transient is a Type Ia SN. The foreground galaxy-cluster gravitational lens creates a set of three images of the SN's host galaxy at redshift 1.52, and we have detected the SN in the trailing, or last-arriving image. The other images are predicted to have arrived ~320 and ~1000 days previously. A target-of-opportunity program with HST has been triggered to measure the transient's light curve through late October. Here we propose three single-orbit WFC3 IR F110W/F160W visits followed by a two-orbit visit to measure the SN's light curve through late December. In a joint proposal, we request NIRSpec G140M and PRISM spectroscopy at the locations of all three images in early October, when the field becomes accessible to JWST. If the SN is a Type Ia SN, then we will be able to calibrate its luminosity and directly measure its magnification. This will provide a novel test of galaxy-cluster mass models. The spectra will enable comparision with low-redshift SNe Ia to address an important systematic that may affect SN Ia cosmology. We also propose for deep JWST NIRCam imaging to measure the flux of the previous arrival of the SN. With 5-sigma limiting depth of 29.2, imaging in F150W can be expected to detect the fading image. Its brightness will constrain the SN's age, and therefore the image's relative time delay. A strong detection and well-characterized 17253( 3) - 18-Oct-2022 21:00:15 - [ 2] SN Ia may enable a new, independent measurement of the Hubble constant. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will acquire F110W and F160W imaging in three visits following the final scheduled visit from GO-16264 (PI: Pierel). Each visit will be split between F110W and F160 WFC3 IR imaging acquired with a dither pattern. The F160W imaging is scheduled for the beginning and end of the visit to minimize Zodaical light contamination of the F110W. The field has visibility through December 23rd, 2022. Visit 18 of GO-16264 is scheduled for Oct 31, 2022 - Nov 10, 2022, and there are two remaining visits scheduled to follow by 10-14 days. Therefore, GO-16264 should be able to acquire observations the week of Nov 11 - 21 and then Nov 22 - Dec 1. Therefore, we hope to schedule visit 1, 2, and 3 for Dec 1 - Dec 8, Dec 9-Dec 17, and then Dec 18-23. ------------------------------------------------------------------------------------ 17253( 3) - 18-Oct-2022 21:00:15 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 LENSED-SN-1 EXT-STAR, SUPERNOVA RA=21H29M40.1969S, J2000 V = 25 +/- 0.5 DEC=+00D05'24.62" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17253( 3) - 18-Oct-2022 21:00:15 - [ 4] Visit: 01 (WFC3 F110W/F160W) Visit Requirements: SCHED 100%; BETWEEN 01-DEC-2022:00:00:00 AND 10-DEC-2022:00:00:00; TOO RESPONSE TIME 21.0D On Hold Comments: Additional Comments: 3 short WFC3-IR F110W and 3 short WFC3-IR F160W exposures of new source in RX-J2129 field. 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 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (349.233 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 | ------------------------------------------------------------------------------------------------------------------------------------ LENSED-SN-1 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM LENSED-SN-1 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM LENSED-SN-1 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM LENSED-SN-1 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM LENSED-SN-1 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM LENSED-SN-1 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM 17253( 3) - 18-Oct-2022 21:00:15 - [ 5] Visit: 02 (WFC3 F110W/F160W) Visit Requirements: SCHED 100%; AFTER 01 BY 10 D TO 16 D; BEFORE 25-DEC-2022:00:00:00; TOO RESPONSE TIME 21.0D On Hold Comments: Additional Comments: 3 short WFC3-IR F110W and 3 short WFC3-IR F160W exposures of new source in RX-J2129 field. 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 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0, 0; SEQ 1-6 CUM (349.233 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 2 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.451, 0.403 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .474, .424 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .925, .827 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.376, 1.230 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.902, 0.806 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.333, 0.333; CUM (349.233 SEQ 7-12 NON-INT S) ------------------------------------------------------------------------------------------------------------------------------------ 8 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 0.784, 0.736 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG .8069, .757 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 10 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 1.258, 1.16 CUM (349.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 17253( 3) - 18-Oct-2022 21:00:15 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 11 LENSED-SN-1 WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=STEP50 1 DEF POS TARG 1.70899, 1.563 CUM (399.233 S) ------------------------------------------------------------------------------------------------------------------------------------ 12 LENSED-SN-1 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP50 1 DEF POS TARG 1.235, 1.139 CUM (349.233 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 | ------------------------------------------------------------------------------------------------------------------------------------ LENSED-SN-1 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM LENSED-SN-1 2 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM LENSED-SN-1 3 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM LENSED-SN-1 4 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM LENSED-SN-1 5 WFC3/IR MULTIAC IR F110W none none none none 1 N/A CUM LENSED-SN-1 6 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM LENSED-SN-1 7 WFC3/IR MULTIAC IR F160W none none none none 2 N/A CUM LENSED-SN-1 8 WFC3/IR MULTIAC IR F160W none none none none 2 N/A CUM LENSED-SN-1 9 WFC3/IR MULTIAC IR F110W none none none none 2 N/A CUM LENSED-SN-1 10 WFC3/IR MULTIAC IR F110W none none none none 2 N/A CUM LENSED-SN-1 11 WFC3/IR MULTIAC IR F110W none none none none 2 N/A CUM LENSED-SN-1 12 WFC3/IR MULTIAC IR F160W none none none none 2 N/A CUM 17253( 3) - 18-Oct-2022 21:00:15 - [ 7] Summary Form for Proposal 17253 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, NSAMP=13, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 10 D TO 16 D, BEFORE 25-DEC-2022:00:00:00, BETWEEN 01-DEC-2022:00:00:00 AND 10-DEC-2022:00:00:00, POS TARG .474, .424, POS TARG .8069, .757, POS TARG .925, .827, POS TARG 0, 0, POS TARG 0.333, 0.333, POS TARG 0.451, 0.403, POS TARG 0.784, 0.736, POS TARG 0.902, 0.806, POS TARG 1.235, 1.139, POS TARG 1.258, 1.16, POS TARG 1.376, 1.230, POS TARG 1.70899, 1.563, SCHED 100%, SEQ 1-6 NON-INT, SEQ 7-12 NON-INT, TOO RESPONSE TIME 21.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W ------------------------------------------------------------------------------------------------------------------------------------ Target Names LENSED-SN-1 ------------------------------------------------------------------------------------------------------------------------------------