0 Assigned ID: 4928 ----- Attempting Submission 1 (Thu Nov 16 00:57:47 GMT 2023) ----- HST Phase I Proposal 4928 successfully submitted. Receipt: # 4928-1 FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser Orbit number out of range (must be equal to or 1 greater than that of the previous sub-exposure). To learn more about orbit numbers, please read the full error text in the Diagnostic Report. FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser FLASH level may be too high for this exposure or a long subexposure. See extended explanation in the diagnostic browser Orbit number out of range (must be equal to or 1 greater than that of the previous sub-exposure). To learn more about orbit numbers, please read the full error text in the Diagnostic Report. Have updated the NSAMP and SPARS for the F160W observations to get more samples than was requested in the original phase 2 submission. Post-flash levels have been set to 20e- 657185386 ----- Attempting Submission 1 (Sun Jan 28 21:43:12 GMT 2024) ----- HST Phase II Proposal 17603 successfully submitted. Receipt: # 17603-1 ----- Attempting Submission 2 (Thu Feb 08 20:58:52 GMT 2024) ----- HST Phase II Proposal 17603 successfully submitted. Receipt: # 17603-2 ----- Attempting Submission 3 (Tue Feb 13 16:24:58 GMT 2024) ----- When the APT was loaded, there was no WIFI connection - hence the reported error about no connection being possible (which has obviously been corrected since then) Did the progenitor of the Type IIb SN2011dh actually have a binary companion? The progenitors of Type IIb SNe retain a small amount of hydrogen (<0.1Msun), making them sensitive probes of the mass loss processes (stellar winds, interactions with binary companions) that affect the evolution of massive stars. SN 2011dh is one of the best observed SNe in the last 20 years, with a peculiar Yellow Supergiant progenitor detected in HST pre-explosion images. Since 2011, late-time UV imaging of the site of SN2011dh had revealed a constant UV-bright source that was assumed for the last 11 years to be the companion to the progenitor, responsible for its peculiar appearance. In 2023, observations of the host galaxy of SN2011dh have revealed that, in the time since the last multiwavelength observations in 2017, the UV brightness of SN2011dh was not constant but has plummeted! Here we propose a deep, multi-wavelength set of observations to probe whether a companion star is truly present, and eliminate other scenarios including the formation of new dust in the fading SN and the role of a light echo. We require deep UV to near-infrared imaging of the site of SN2011dh. In order to capture the evolution of SN2011dh, we require an observation in the next 2 - 3 months (which has been implemented in the visit planner). Each observation, with each filter, is split into two subexposures with a dither offset. We are using the default 2-point line dither patterns for the UVIS and IR channels to allow for rejection of cosmic rays, hot pixels and blobs. We have grouped filters ([F657N and F336W], [F275W and F814W], [F555W, F125W and F160W]) to acquire exposures with alternating filters within the 2-point dither pattern so all observations can fit within the 5 orbit allocation. The pointing is centered on the position of SN2011dh, and we are using the 1k x 1k CTE subarray (for UVIS) to minimize readout time and the effects of CTE - for the IR image we are acquiring the full frame. Maund is an expert in the study of the progenitors of CCSNe; having worked on the topic for 20 years. Maund has been PI of a number of HST proposals to study the progenitors of SNe, in particular establishing the importance of late-time observations for confirming the identities of the progenitors and studying their surrounding environments. Maund has led 2 HST proposals to specifically look at SN2011dh and developed the light echo code used for studying the previous observations. Stellar Physics and Stellar Types Stellar Populations and the Interstellar Medium 3 false false false false false true false false SUPPORTED EXT-STAR SUPERNOVA TYPE II NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F275W WFC3/UVIS Imaging No No F336W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F657N WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F125W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.636 LINE false false 2 41.788 WFC3-IR-DITHER-LINE 1 false POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 2 false /Users/justyn/Downloads/OP-cache/HST_midcycle-v01.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17603 :visit-id "01" :proposal-version -1 :trans-version "20230626" :date "08-Feb-2024 20:21:35.0" :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 17603 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17603 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2876 :al-overhead-at-end 127 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3263 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17603 :visit-id "01" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2871 :al-overhead-at-end 127 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3263 :pcs-gap 0 ) true 2 0 /private/var/folders/6z/cjqjbyhs7_3gnswzmy0z1h3r0000gn/T/OPVisit18297397944414494241.xml The scheduling data was generated by CASM 32.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 17603 :visit-id "02" :proposal-version -1 :trans-version "20230626" :date "13-Feb-2024 16:20:47.0" :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 2498480 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 17603 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 17603 :visit-id "02" :orbit-number 1 :pcs-time 383 :si-vis-utilization 2880 :al-overhead-at-end 127 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3263 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17603 :visit-id "02" :orbit-number 2 :pcs-time 392 :si-vis-utilization 2870 :al-overhead-at-end 127 :internal-dur-at-end 31 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3263 :pcs-gap 0 ) (Tic-Orbit :proposal-id 17603 :visit-id "02" :orbit-number 3 :pcs-time 392 :si-vis-utilization 2864 :al-overhead-at-end 127 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3263 :pcs-gap 0 ) true 3 0