0 Assigned ID: 6633 ----- Attempting Submission 1 (Thu Apr 10 19:32:48 GMT 2025) ----- HST Phase I Proposal 6633 successfully submitted. Receipt: # 6633-1 ----- Attempting Submission 2 (Thu Apr 10 20:53:54 GMT 2025) ----- HST Phase I Proposal 6633 successfully submitted. Receipt: # 6633-2 ----- Attempting Submission 3 (Thu Apr 10 22:22:16 GMT 2025) ----- HST Phase I Proposal 6633 successfully submitted. Receipt: # 6633-3 ----- Attempting Submission 4 (Thu Apr 10 22:59:07 GMT 2025) ----- HST Phase I Proposal 6633 successfully submitted. Receipt: # 6633-4 0 ----- Attempting Submission 1 (Thu Aug 14 15:39:41 GMT 2025) ----- ----- Attempting Submission 2 (Fri May 01 17:31:43 GMT 2026) ----- ----- Attempting Submission 3 (Fri May 08 19:19:41 GMT 2026) ----- ----- Attempting Submission 4 (Mon May 11 14:08:45 GMT 2026) ----- ----- Attempting Submission 5 (Tue Jul 07 17:27:03 GMT 2026) ----- We have not changed any of the target coordinates since the previous Phase II submission. Searching for the Survivor: Deep HST Imaging of the Explosion Site of SN2022jli Binary physics is important as >60% massive stars form in some kind of interacting binary system. The identification of progenitor systems of stripped-envelope supernovae (SESNe) offers one means to directly constrain binary evolution pathways, with implications ranging from the evolution of massive stars to the integrated stellar light from distant galaxies. Although the method by which SESN progenitors lose their envelopes remains uncertain, growing evidence have been shifting the paradigm from single star models to binary models. In recent years, five direct detections of surviving companions to SESN have been detected. However, the sample size is still too small to be statistically meaningful. Since suitable candidates for this type of search are rare, each additional new data point carries significant statistical weight. Here, we propose deep WFC3/UVIS optical and UV imaging of the only suitable SESNe target for a deep companions search in Cycle 33: SN 2022jli, which already has strong evidence of having a surviving companion. As with other companion searches, we plan to detect or place meaningful limits on any surviving companion. We also propose one orbit each to obtain F555W astrometry on the recent SN2024abfo and SN2024iss for potential future follow-up companion searches. This study will utilize HST's unique UV capabilities and build a statistically significant sample that will advance our current understanding of binary evolution. Given the rarity of relevant events and the limited HST lifetime, acquiring these observations is critical. In this proposal, we will obtain deep WFC3/UVIS optical and UV imaging of the explosion site of SN 2022jli in order to either detect or place meaningful limits on any surviving companion to the supernova progenitor. Specifically, we will observe in the F336W, F438W, and F555W filters with total exposures time of 12880, 8295 and 3807 seconds, respectively. The source is expected to be faint, so we have placed it at the UVIS2-512C-CTE aperture. However, we read out the entire array to increase the number of stars that can be used for image alignment. The impacts of a reduced gyro operations on this program are primarily reduced schedualability due to the smaller field of regard. To help mitigate, we have split the 10 orbits allocated to observations of SN2022jli into four visits with 2 or 3 orbits each. However, as the target is expected to be variabily on the timescale of ~year, and we wish to use the observations in three filters to place constraints on the SED of the surviving companion, we require that all orbits are obtained within ~1 month (30 days) of each other. We have implemented manual dithering via the POS TARG values for the observations in different filters that will be split between different visits. Finally, we also obtain one orbit of imaging each for the fields of SN2024abfo and SN2024iss. Our goal is image the supernova themselves to obtain precise astrometry for the explosions. Our team consists of experts ranging from theory to observation. PI Jenny Su is an expert in observations of SN progenitors and companions with HST. She is supported by Dr. Ori Fox, who has led the HST/COS paper on detecting the companion to SN 1993J (Fox et al. 2014) and was PI of the HST/WFC3 program that led to papers on the companions to SN 2002ap (Co-I Zapartas et al. 2017a) and SN 2001ig (Co-I Ryder et al. 2018). For Observations, Data Reduction, Analysis, and Interpretation: Dr. Jennifer Andrews is an expert observer and works heavily on SNe. With approved time on MMT, she will any necessary supporting ground-based observations. Ms. K. Azalee Bostroem is an expert on HST data, as she used to work at STScI as a Research Instrument Analyst. Dr. Maria Drout is an expert in stripped-envelope SNe. Professor Alex Filippenko has approved time on Keck and Lick that can provide for any necessary supporting ground-based observations. Professor Pat Kelly has long studied the properties of host galaxies of SNe. Dr. Jon Mauerhan is an expert on spectropolarimetry and has much experience regarding the properties of massive stars. Mr. Nathan Miles is an expert on HST/WFC3 data, as he currently works at STScI as a Research Instrument Analyst. Professor Dan Milisavljevic is an expert in SN theory and observations. Dr. Stuart Ryder is an expert in binary companion observations. Professor Nathan Smith is an expert in the properties and evolution of massive stars, and on spectroscopy of SNe. Dr. Schuyler Van Dyk is an expert in HST photometry of SNe and in the study of stripped-envelope SNe. Dr. WeiKang Zheng is an expert at CCD imaging and photometry of SNe, both ground-based and HST; he will construct multifilter light curves of the object. Dr. Ben Williams is an expert in local stellar populations, which is an important aspect of our study in case we need to disentangle line of sight coincidences. Armin Rest is an expert in HST and JWST data processing. For Theory and Interpretation: Professor Selma de Mink is an expert in SN population synthesis theory and modeling. Dr. Niharika Sravan is an expert in binary modeling. Dr. Emmanouil Zapartas is an expert in population synthesis theory and modeling. Dr. Justin Pierel, Dr. Melissa Shahbandeh, and Dr. Sebastian Gomez are postdocs at STScI working with Dr. Ori Fox. All are expert observers with extensive HST data reduction and analysis experience. Stellar Physics and Stellar Types 6 false true false false false false false SUPPORTED EXT-STAR SUPERNOVA J2000 J2000 EXT-STAR SUPERNOVA J2000 J2000 EXT-STAR SUPERNOVA J2000 J2000 WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F555W POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false The scheduling data was generated by CASM 34.1. 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