0 Made some final changes in ACQ Mirrors and COS ETC Ids as suggested by the Contact Scientist. -307476343 ----- Attempting Submission 1 (Thu Aug 14 15:22:21 GMT 2025) ----- HST Phase II Proposal 18076 successfully submitted. Receipt: # 18076-1 ----- Attempting Submission 2 (Thu Aug 14 15:23:39 GMT 2025) ----- ----- Attempting Submission 3 (Wed Oct 29 13:30:04 GMT 2025) ----- HST Phase II Proposal 18076 successfully submitted. Receipt: # 18076-3 ----- Attempting Submission 4 (Fri Oct 31 15:35:59 GMT 2025) ----- Ok Unveiling the Circumgalactic Medium of M33: A Study of Satellite-Host Interactions in the Local Group Satellite galaxies are cosmic storytellers, revealing how galaxies collide, evolve, and grow. Interactions with their hosts through ram-pressure and tidal stripping--can rapidly quench star formation. However, the circumgalactic medium (CGM), which serves as a protective outer envelope, remains largely unexplored for satellite galaxies, with the Large Magellanic Cloud (LMC) being the only well-studied case. We propose to study the CGM of the Triangulum Galaxy (M33), the most massive satellite of Andromeda (M31) and an analog to the LMC. We request 30 orbits of HST/COS G130M spectroscopy to observe four new quasars. Combining with two archival sightlines, we will map M33's inner CGM (within 0.5 Rvir). Our goals are to: (1) determine if M33 hosts its own CGM or it has merged into M31's CGM, (2) compare it with the LMC to assess how environment and infall history shape CGM evolution, and (3) test predictions from simulations of satellite CGM evolution. This research offers a unique opportunity to advance our understanding of how feedback, host mass, and orbit influence satellite CGMs through direct observational constraints beyond the Milky Way. This is a COS FUV program to observe four QSO targets probing the halo of the M33 galaxy. The science goal is find out if M33 has its own CGM or it is merged with that of M31. I will use UV metal absoption lines in the spectra of G130M spectra of these quasars. The targets will be acquired with a NUV ACQ/IMAGE with the PSA and MIRRORA (object 1,2, 4) MIRRORB (object 4), followed by science observations with the G130M/1291 setting. We used two FP-POS 3 and 4 in each visit. These four objects are spread across 11 visits. All visits are up to 3 orbits in length, following the guidance from the PC. Dr Elena DOnghia is an expert in galaxy dynamics and the circumgalactic medium of dwarf galaxies. She led theoretical work on the pre-processing of dwarf galaxy in low-density environments. Her expertise in galaxy modeling and Local Group structure is directly relevant to interpreting M33s CGM in the context of environmental pre-processing. Co-PI Dr Andrew Fox is an expert in the gaseous halos of galaxies and the analysis of UV spectra. He has led ten HST GO and two AR proposals, and has first-authored over 20 refereed journal papers in related fields. He will coordinate and oversee the analysis and manage the Co-I contributions. Dr Frances Cashman is an expert on the ISM and IGM and on Cloudy simulations of interstellar absorbers, and the properties of interstellar gas near the Galactic Center. Dr Nicolas Lehner has extensive experience leading large-scale studies of the IGM and CGM at both low and high redshifts, as well as investigations of the ISM in nearby galaxies, and the high-velocity population in the Milky Way halo. He has led Project AMIGA on the CGM of M31. He will use his expertise to help infer the observed features on the inner CGM of the M33. Many of his projects have resulted in the release of valuable data products to the community through the igmspec database (http://github.com/specdb), CDS/Vizier, and the NASA Keck Observatory Archive (KOA). Dr Scott Lucchini is an expert on simulations of the Magellanic System. He has published three papers on this subject (including one in Nature). PI Dr Sapna Mishra is an expert in UV and optical quasar absorption line spectroscopy, with a focus on studying the Magellanic systems, CGM, IGM and galaxy clusters. She is leading the analysis on the cool CGM of the LMC from HST archival program 17053. She has led HST-GO proposal on the Magellanic clouds program 17757. Dr Adam Smercina is an expert and uses resolved stellar populations, interstellar content, and satellite populations of local galaxies to understand how they change over time, especially as a result of their interactions with other galaxies. He will help us in interpreting our results in context of galaxy interaction in general. Dr Cameron Trapp is expert in the simulation of theCGM. He will lead the simulations in this program. Dr Jason Tumlinson is expert in the UV and optical absorption line studies both in observation and simulation. He is also expert in the halo gas physics in galaxies of different halo masses. He will assist us in interpreting our results and the oversee the simulation analysis. Dr Anna Wright is an observationally-oriented theorist who specializes in the formation and evolution of dwarf galaxies, with a particular focus on how these galaxies are influenced by their environments. She is the principal investigator on an HST Cycle 31 program aimed at improving the fidelity with which simulations model the gas and stars of dwarf galaxies as they undergo ram pressure stripping. She has experience producing and analyzing synthetic data from simulations. Intergalactic Medium and the Circumgalactic Medium Galaxies 6 false true false false true false false false false false SUPPORTED ISM ABSORPTION LINE SYSTEM ABSORPTION LINE SYSTEM - EXTRAGALACTIC ABSORPTION LINE SYSTEM - GALACTIC HALO NO magnitude is in G-band J2000 J2000 19.09 (FUV) ISM ABSORPTION LINE SYSTEM ABSORPTION LINE SYSTEM - EXTRAGALACTIC ABSORPTION LINE SYSTEM - GALACTIC HALO NO magnitude is in G band J2000 J2000 19.02 (FUV) ISM ABSORPTION LINE SYSTEM ABSORPTION LINE SYSTEM - EXTRAGALACTIC ABSORPTION LINE SYSTEM - GALACTIC HALO NO magnitude is in G band J2000 J2000 18.81 (FUV) ISM ABSORPTION LINE SYSTEM ABSORPTION LINE SYSTEM - EXTRAGALACTIC ABSORPTION LINE SYSTEM - GALACTIC HALO NO magnitude is in G band J2000 J2000 18.06 (FUV) COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 COS/FUV Spectroscopic No No G130M 1291 /Users/smishra/Downloads/OP-cache/18076-v01.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. 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CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "02" :proposal-version -1 :trans-version "20250624" :date "28-Oct-2025 15:03:51.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 217776 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "02" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "02" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "02" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) false 3 0 NUV mag = 18.9134 /Users/smishra/Downloads/OP-cache/18076-v03.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "03" :proposal-version -1 :trans-version "20250624" :date "30-Oct-2025 08:37:07.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 235280 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "03" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "03" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "03" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 3 0 NUV mag = 18.9134 /Users/smishra/Downloads/OP-cache/18076-v04.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "04" :proposal-version -1 :trans-version "20250624" :date "28-Oct-2025 15:02:30.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 235280 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "04" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "04" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "04" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) false 3 0 NUV mag = 18.781 /Users/smishra/Downloads/OP-cache/18076-v05.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "05" :proposal-version -1 :trans-version "20250624" :date "28-Oct-2025 15:02:48.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 148112 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "05" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "05" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) false 2 0 NUV mag = 18.781 /Users/smishra/Downloads/OP-cache/18076-v06.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "06" :proposal-version -1 :trans-version "20250624" :date "28-Oct-2025 15:03:04.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 148112 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "06" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "06" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) false 2 0 NUV mag = 18.781 /Users/smishra/Downloads/OP-cache/18076-v07.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "07" :proposal-version -1 :trans-version "20250624" :date "31-Oct-2025 09:28:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 217776 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "07" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 2286 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "07" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 2286 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "07" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) true 3 0 NUV mag = 18.0356 /Users/smishra/Downloads/OP-cache/18076-v08.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "08" :proposal-version -1 :trans-version "20250624" :date "31-Oct-2025 09:28:20.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 217776 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "08" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 2286 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "08" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 2286 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "08" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) true 3 0 NUV mag = 18.0356 /Users/smishra/Downloads/OP-cache/18076-v09.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "09" :proposal-version -1 :trans-version "20250624" :date "31-Oct-2025 09:28:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 235280 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "09" :obset-id "09" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "09" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 2286 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "09" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 2286 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "09" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2603 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2983 :pcs-gap 0 ) true 3 0 NUV mag = 18.0356 The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. /Users/smishra/Downloads/OP-cache/18076-v10.xml (Tic-Visit :proposal-id 18076 :visit-id "10" :proposal-version -1 :trans-version "20250624" :date "31-Oct-2025 09:24:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 235280 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "10" :obset-id "10" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "10" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "10" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "10" :orbit-number 3 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 3 0 NUV mag = 17.7972 /Users/smishra/Downloads/OP-cache/18076-v11.xml The scheduling data was generated by CASM 33.1. CASM was run in Phase II mode. (Tic-Visit :proposal-id 18076 :visit-id "11" :proposal-version -1 :trans-version "20250624" :date "31-Oct-2025 09:24:59.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 148112 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 18076 :visit-id "11" :obset-id "11" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 18076 :visit-id "11" :orbit-number 1 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 2282 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) (Tic-Orbit :proposal-id 18076 :visit-id "11" :orbit-number 2 :pcs-time 380 :si-vis-utilization 2607 :al-overhead-at-end 0 :internal-dur-at-end 517 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2987 :pcs-gap 0 ) true 2 0 NUV mag = 17.7972