0 Assigned ID: 4656 ----- Attempting Submission 1 (Wed May 24 21:12:53 GMT 2023) ----- This pattern is not used in this proposal. Based on conversations with Jay and Christian, split this into 12 individual visits and limited to 1 guide star. -237302577 ----- Attempting Submission 1 (Fri Sep 15 01:39:46 GMT 2023) ----- ----- Attempting Submission 2 (Fri Sep 22 11:36:07 GMT 2023) ----- ----- Attempting Submission 3 (Mon Dec 04 20:50:16 GMT 2023) ----- ----- Attempting Submission 4 (Wed Sep 03 14:09:09 GMT 2025) ----- pattern there just in case Adding the Stripped-Envelope Supernova iPTF 13bvn to the Ongoing Search for Surviving Companion Stars The mass-loss mechanism for stripped-envelope supernovae (SESNe) remains debated, but evidence is starting to mount in support of binary star mass-transfer. There are now five direct post-explosion detections of surviving companions. A statistically complete sample of companion-masses can provide important constraints on the underlying physics used in binary evolution models, which have implications on many stellar systems, including merger sources for gravitational waves. The sample is still too small. Every additional data point is impactful. But building the proper dataset is a tedious and painstaking process given the small number of reasonable candidates each year. We confirm that all other viable nearby SESNe at <20 Mpc have already been targeted. Here we propose optical+UV observations of the next most feasible and interesting target, iPTF 13bvn at 22 Mpc, to detect (or place meaningful limits on) any surviving companion. iPTF 13bvn was the very first SN Ib to have a progenitor identification, but the details have remained shrouded in ambiguity. A follow-up search for a surviving companion was never fully explored because the distance initially seemed prohibitive. We show that despite these limitations, deep UV/F336W imaging can now offer an optimum detection strategy for the expected hot, blue stellar companion, while optical imaging can constrain the companion star model, rule out shock interaction contributions, and probe less likely, but possible, cooler star companions. Given HST's time horizon and the requisite waiting period to allow new SNe to fade before conducting a companion search, now is the time to take full advantage of HST's unique UV capabilities. WFC3: - Use entire array to aquire fiducial stars for alignment purposes - Use 512_UVIS2_CTE aperture to minimize photon transfer losses - When scheduled, please have CS contact PI to finalize pos_tag based on final orientation - EXPTIME (actual): -SN iPTF13bvn (12 orbits) -F336W (17500 s) -F555W (13500 s) - FLASH = varies with aim of minimizing photon transfer losses and read noise - Here is the situation: *We are trying to detect a single, very faint source (surviving star from a supernova). We only care about one position, not the entire field. *We have placed the pointing in the center of the UVIS2-512C-CTE aperture, so that will help with the CTE. *We are not sure what the background from the galaxy looks like, but it may contribute to the flux slightly (or not at all). *It is easy to adjust the Flash value in APT to turn the warning off, but we are hoping we aren't adding too much noise unnecessarily, as this source is faint. -For dithering, we use 5 different POS TARGS instead *Impact of Gyros* We have considered the impact of reduced gyro operations on our program, which has 12 orbits requested. We were able to successfully reduce this target to 4 visits, each with 3 orits per visit. The only condition is that all filters must be obtained in the same orientation for several reasons, including time variablility and optimized sampling and reductions. Therefore, we have added the constraint that all be scheduled within 1 day of each other. Our team consists of experts ranging from theory to observation. PI Dr. Ori Fox is an expert in observations of SN companions with HST. He 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. 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 PI 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 SUPPORTED EXT-STAR SUPERNOVA TYPE IB This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F336W 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 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. 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CASM was run in Phase II mode. /private/var/folders/yh/kl4y3s1x3_j3ywy3qq67g3vc0001kc/T/OPVisit16143041341509506897.xml (Tic-Visit :proposal-id 17529 :visit-id "02" :proposal-version -1 :trans-version "20250624" :date "03-Sep-2025 07:10:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 577488 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17529 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17529 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. /private/var/folders/yh/kl4y3s1x3_j3ywy3qq67g3vc0001kc/T/OPVisit11146580862686222356.xml (Tic-Visit :proposal-id 17529 :visit-id "03" :proposal-version -1 :trans-version "20250624" :date "03-Sep-2025 07:10:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 577488 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17529 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17529 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. /private/var/folders/yh/kl4y3s1x3_j3ywy3qq67g3vc0001kc/T/OPVisit16807536550966269993.xml (Tic-Visit :proposal-id 17529 :visit-id "04" :proposal-version -1 :trans-version "20250624" :date "03-Sep-2025 07:10:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 577488 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17529 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17529 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2599 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. 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CASM was run in Phase II mode. /private/var/folders/yh/kl4y3s1x3_j3ywy3qq67g3vc0001kc/T/OPVisit11158902009581744456.xml (Tic-Visit :proposal-id 17529 :visit-id "06" :proposal-version -1 :trans-version "20250624" :date "03-Sep-2025 07:10:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 577488 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17529 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17529 :visit-id "06" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. 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CASM was run in Phase II mode. /private/var/folders/yh/kl4y3s1x3_j3ywy3qq67g3vc0001kc/T/OPVisit7840220600316837222.xml (Tic-Visit :proposal-id 17529 :visit-id "08" :proposal-version -1 :trans-version "20250624" :date "03-Sep-2025 07:10:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 577488 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17529 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17529 :visit-id "08" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. /private/var/folders/yh/kl4y3s1x3_j3ywy3qq67g3vc0001kc/T/OPVisit13266730980227681535.xml (Tic-Visit :proposal-id 17529 :visit-id "09" :proposal-version -1 :trans-version "20250624" :date "03-Sep-2025 07:10:14.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 577488 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17529 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17529 :visit-id "09" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2598 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 0 Timing link suitability includes constraints ([Group (01 02 03 04 05 06 07 08 09 10 11 12) Within 7.0 days]) The scheduling data was generated by CASM 33.1. 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