0 Assigned ID: 4869 ----- Attempting Submission 1 (Wed May 24 23:58:28 GMT 2023) ----- HST Phase I Proposal 4869 successfully submitted. Receipt: # 4869-1 ----- Attempting Submission 2 (Thu May 25 00:00:12 GMT 2023) ----- All timing constraints set to be the same BETWEEN - Jan 15 2025 thru Feb 15 2025. The SEQUENCE has been removed. --v2-- Updated dithering and offsets between different exposures to better sample PSF and bad pixels. --v3-- approving repeat visits for failed acq visits -1131075941 ----- Attempting Submission 1 (Mon Sep 04 14:46:03 GMT 2023) ----- HST Phase II Proposal 17429 successfully submitted. Receipt: # 17429-1 ----- Attempting Submission 2 (Thu Sep 07 12:48:28 GMT 2023) ----- HST Phase II Proposal 17429 successfully submitted. Receipt: # 17429-2 ----- Attempting Submission 3 (Tue Oct 24 19:16:28 GMT 2023) ----- Your proposal could not be saved. Submission aborted. ----- Attempting Submission 4 (Mon Oct 30 16:46:45 GMT 2023) ----- HST Phase II Proposal 17429 successfully submitted. Receipt: # 17429-4 ----- Attempting Submission 5 (Wed Nov 01 15:50:38 GMT 2023) ----- ----- Attempting Submission 6 (Tue Jul 30 19:50:42 GMT 2024) ----- HST Phase II Proposal 17837 successfully submitted. Receipt: # 17837-6 ----- Attempting Submission 7 (Thu Aug 08 20:43:55 GMT 2024) ----- ----- Attempting Submission 8 (Fri Oct 18 22:05:20 GMT 2024) ----- ----- Attempting Submission 9 (Sat Feb 01 17:22:24 GMT 2025) ----- Elevating the Scientific Output of JWST by using HST to Examine the Heart of Type Ia Supernova 2021aefx Despite Type Ia supernovae (SNe Ia) remaining a benchmark of precision cosmology, a consensus on how and why some white dwarfs explode as SNe Ia eludes the astronomical community. Photometric observations of SNe Ia at late times measure the conversion efficiency of radioactive decay energy into photons. We request 10 orbits of HST/WFC3 observations in Cycle 31 and 8 orbits in Cycle 32 to observe the normal SN Ia 2021aefx at 750d, 1000d, and 1150d after the explosion in conjunction with already awarded JWST near- and mid-infrared spectra. These complimentary HST and JWST observations provide complete wavelength coverage from 0.4-14 microns spanning years after the explosion. Such data are non-existent in the literature and we do not foresee similar opportunities in the overlapping lifetimes of HST and JWST. Measuring the complete spectral energy distribution at nebular phases allows a direct estimate of the total radioactive decay energy, which in turn depends on the nucleosynthetic yield of the explosion. Many correlations have been proposed for estimating the nucleosynthetic yield of a SN Ia but uncertainties regarding emission in the mid-IR prevented definitive conclusions. With the proposed HST/WFC3 time we can elevate the scientific output from this SN to a level that JWST cannot reach alone, and SN~2021aefx will become a once-in-a-decade event that paves the way for the next generation of SN Ia models. Late-time observations of SN Ia 2021aefx at 750d and 1000d coinciding with JWST observations using F438W, F555W, F600LP, F110W, and F160W filters. PI Dr. Michael Tucker is an expert on SNe Ia in the nebular phase. Co-I Peter Hoeflich is the main developer of the non-LTE radiation-transport code HYDRA which has been widely applied to analyze light curves of spectra of SNe including JWST spectra of SN2021aefx. Co-I Benjamin Shappee is an expert in the reduction and analysis of HST data and SNe Ia. Co-Is Ashall and DerKacy are experts on synthesizing observations and models for SNe Ia. Co-I Melissa Shahbandeh is an expert on HST data and SNe Ia. Stellar Physics and Stellar Types 6 false false false false false false SUPPORTED EXT-STAR SUPERNOVA SUPERNOVA TYPE IA J2000 J2000 WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F600LP WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F600LP WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F600LP POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 2 false POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 4 false POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 5 false The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /private/var/folders/5m/hd1kc3ks4m1_z9sk_wdrd3680000gq/T/OPVisit6057787387825246518.xml 1150d after peak brightness. Observations in F438W and F555W 1737141412000 49.8135922907675 (Tic-Visit :proposal-id 17837 :visit-id "01" :proposal-version -1 :trans-version "20241216" :date "01-Feb-2025 12:21:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17837 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17837 :visit-id "01" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2718 :al-overhead-at-end 96 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "01" :orbit-number 2 :pcs-time 301 :si-vis-utilization 2697 :al-overhead-at-end 103 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "01" :orbit-number 3 :pcs-time 301 :si-vis-utilization 2677 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /private/var/folders/5m/hd1kc3ks4m1_z9sk_wdrd3680000gq/T/OPVisit17507324584812558414.xml 1150d after peak brightness. Observations in F438W and F555W (Tic-Visit :proposal-id 17837 :visit-id "51" :proposal-version -1 :trans-version "20241216" :date "01-Feb-2025 12:21:31.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17837 :visit-id "51" :obset-id "51" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17837 :visit-id "51" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2718 :al-overhead-at-end 96 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "51" :orbit-number 2 :pcs-time 301 :si-vis-utilization 2697 :al-overhead-at-end 103 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "51" :orbit-number 3 :pcs-time 301 :si-vis-utilization 2677 :al-overhead-at-end 123 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /private/var/folders/5m/hd1kc3ks4m1_z9sk_wdrd3680000gq/T/OPVisit13542003406188513833.xml F600LP exposures, 3 orbits 1737158419000 50.00628668146601 (Tic-Visit :proposal-id 17837 :visit-id "02" :proposal-version -1 :trans-version "20241216" :date "01-Feb-2025 12:21:32.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1732464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17837 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17837 :visit-id "02" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2718 :al-overhead-at-end 96 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "02" :orbit-number 2 :pcs-time 301 :si-vis-utilization 2698 :al-overhead-at-end 96 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "02" :orbit-number 3 :pcs-time 301 :si-vis-utilization 2678 :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 3078 :pcs-gap 0 ) true 3 0 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /private/var/folders/5m/hd1kc3ks4m1_z9sk_wdrd3680000gq/T/OPVisit8995001251419123823.xml Additional F555W and F600LP exposures 1737254796000 51.099415658960794 (Tic-Visit :proposal-id 17837 :visit-id "03" :proposal-version -1 :trans-version "20241216" :date "01-Feb-2025 12:21:33.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154976 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17837 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17837 :visit-id "03" :orbit-number 1 :pcs-time 301 :si-vis-utilization 2718 :al-overhead-at-end 96 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3078 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17837 :visit-id "03" :orbit-number 2 :pcs-time 301 :si-vis-utilization 2678 :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 3078 :pcs-gap 0 ) true 2 0 The scheduling data was generated by CASM 33.0. CASM was run in Phase II mode. /Users/tucker.957/Library/CloudStorage/OneDrive-TheOhioStateUniversity/HSTcycle32/OP-cache/2021aefx_v3-v53.xml Additional F555W and F600LP exposures (Tic-Visit :proposal-id 17837 :visit-id "53" :proposal-version -1 :trans-version "20241216" :date "01-Feb-2025 12:20:14.0" :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 17837 :visit-id "53" :obset-id "53" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17837 :visit-id "53" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2678 :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 3078 :pcs-gap 0 ) true 1 0