0 Assigned ID: 6002 ----- Attempting Submission 1 (Fri Nov 08 00:28:21 GMT 2024) ----- HST Phase I Proposal 6002 successfully submitted. Receipt: # 6002-1 POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. POS TARG & PATTERN should be used carefully with ACS ramp filters as central wavelengths & transmission efficiencies vary within the apertures. We have modified the final orbit of ASASSN-14li to ensure that all of the FR505N exposures have similar enough exposure times for drizzling. -2006614488 ----- Attempting Submission 1 (Thu Jan 30 00:52:05 GMT 2025) ----- HST Phase II Proposal 17909 successfully submitted. Receipt: # 17909-1 ----- Attempting Submission 2 (Thu Mar 06 22:39:21 GMT 2025) ----- HST Phase II Proposal 17909 successfully submitted. Receipt: # 17909-2 ----- Attempting Submission 3 (Wed Mar 12 02:08:39 GMT 2025) ----- The warnings are all about the use of a dither pattern with the ramp filters FR505N and FR647M. We have updated the pattern orientation and spacing to work with the ramp filters, following further guidance based on our initial Phase II submission. Rest-Frame [O III] Imaging of Post-Starburst TDE Hosts with Extended Emission Line Regions Post-starburst galaxies, with little current star formation but evidence of a recent large burst, are promising probes of the transition between star-forming and quiescent galaxies. The cause of the rapid quenching of star formation is debated, with gas-rich mergers, stellar feedback, and active galactic nucleus (AGN) feedback all plausible explanations. Recent studies have discovered extended [O III] emission line regions (EELRs) in several post-starburst galaxies, inconsistent with current AGN activity but compatible with AGN activity over the past several thousand years. Interestingly, many post-starburst galaxies with EELRs have also been hosts to recent tidal disruption events (TDEs), a transient class for which post-starburst galaxies are highly overrepresented as host galaxies. Here we propose to obtain an epoch of narrow-band rest-frame [O III] (FR505N) and medium-band continuum (FR647M) imaging of three post-starburst TDE hosts with observed EELRs to more finely map their spatial distribution. These observations require the use of the ramp filters on ACS/WFC. The high spatial resolution [O III] images will address important questions about the interplay between AGN activity and the nature of post-starburst galaxies. We will (1) test the possibility that TDEs power the EELRs through a search for shells of emission, (2) constrain the AGN active lifetime from the most distant EELR, and (3) provide insight into the connection between diverse forms of nuclear SMBH activity like AGNs, TDEs, and quasi-periodic eruptions. This program aims to observe extended emission line regions (EELRs) in three nearby TDE host galaxies. The three host galaxies are those of ASASSN-14li, iPTF16fl, and ASASSN-19dj. Each has exisiting IFU data showing the prescence and distribution of known EELRs. These HST ACS/WFC data will dramatically increase the spatial resolution with which we can measure the difuse [O III] flux in addition to modestly expanding the field of view allowing us to observe more distant EELRs. We will use the FR505N ramp filter of ACS/WFC to obtain rest-frame [O III] imaging for these host galaixes. For the redshifts of the hosts, ASASSN-14li (z = 0.0206), iPTF16fnl (z = 0.016328), and ASASSN-19dj (z = 0.022346), the strong [O III] line at lambda = 5007 is at an observed wavelength of 5110 A, 5089 A, and 5119 A respectively, all accessible to FR505N. Given the low equivalent widths of some known EELRs, we additionally will use the FR647M ramp filter to measure the spatial distribution of the stellar continuum emission, which can then be subtracted to yield an [O III]-only image. The known EELR positions for ASASSN-14li and ASASSN-19dj allow for any orientation to capture the EELRs within the monochromatic extent of the ramp filters. However, the known positions of EELRs in the host galaxy of iPTF16fnl means that some orientation angles will exclude known regions. Using APT and the WFC1-MRAMPQ aperture for the FR505N filter, we find that orient ranges of 75 - 130 degrees and 255 - 310 degrees will include the known EELRs within the monochromatic extent of FR505N. Other orientations will miss more distant EELRs and are therefore not feasible. We have maximized the acceptable orient range to increase the schedulability of the observations. The members have a long history of collaboration on tidal distruption events, supernovae (SNe), and other transients. PI Jason Hinkle is a TDE, AGN, and ambigious nuclear transient expert and has led 11 papers on these topics. He has has worked on nuclear transient data sets spanning from the X-rays to sub-mm and is a broad observer. Many of the transient discovery papers he has led include characterization of the host galaxies. Co-I Ben Shappee is an expert in SN physics and observations. He is also an expert on image subtraction, as a founding member of the All-Sky Automated Survey for Supernovae (ASAS-SN). Galaxies Supermassive Black Holes and Active Galaxies 6 false false false false false false false SUPPORTED GALAXY ELLIPTICAL SHELL YES J2000 J2000 Host-galaxy V-band magnitude estimated from ASAS-SN light curve. GALAXY DISK SHELL YES J2000 J2000 Host-galaxy V-band magnitude estimated from ASAS-SN light curve. GALAXY ELLIPTICAL SHELL YES J2000 J2000 Host-galaxy V-band magnitude estimated from ASAS-SN light curve. ACS/WFC RampFilter No No FR505N ACS/WFC RampFilter No No FR647M ACS/WFC RampFilter No No FR505N ACS/WFC RampFilter No No FR647M ACS/WFC RampFilter No No FR505N ACS/WFC RampFilter No No FR647M POS-TARG DITHER 0.125 LINE false false 3 135 ACS-WFC-DITHER-LINE 2 false POS-TARG DITHER 0.125 LINE false false 2 135 ACS-WFC-DITHER-LINE 3 false The scheduling data was generated by CASM 32.1.3. 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CASM was run in Phase II mode. /System/Volumes/Data/solaris/user1/mdocher/hst-work/OP-cache/17909-v03.xml 1758858496000 288.0614042949092 (Tic-Visit :proposal-id 17909 :visit-id "03" :proposal-version -1 :trans-version "20250929" :date "05-May-2026 11:49:06.0" :trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 426464 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17909 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17909 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2647 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2979 :pcs-gap 0 ) true 1 1 /System/Volumes/Data/solaris/user1/mdocher/hst-work/OP-cache/17909-v2A.xml The scheduling data was generated by CASM 34.0. CASM was run in Phase II mode. 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