0 Assigned ID: 1063 ----- Attempting Submission 1 (Fri Apr 08 23:49:44 GMT 2016) ----- HST Phase I Proposal 1063 (sn2011ht.apt) successfully submitted. Receipt: # 1063-1 0 ----- Attempting Submission 1 (Fri Jul 15 19:18:57 GMT 2016) ----- ----- Attempting Submission 2 (Tue Sep 13 00:08:40 GMT 2016) ----- Death or Survival? Determining the nature of SNe IIn-P explosions An increasing number of transients classifiable as interacting supernovae of Type IIn have become the subject of intense debate, as the death or survival of the precursor star is unclear. This is because giant non-terminal eruptions from massive luminous blue variable (LBV) stars can spectroscopically resemble SNe IIn and achieve comparable luminosities via shock interaction with pre-existing circumstellar material (CSM). The stellar origin of the new SNe IIn-P class of explosions is particularly controversial. Competing interpretations predict stellar progenitors with very different initial masses and explosion outcomes: 1) non-terminal super-Eddington eruptions from LBVs; 2) collapsars from very massive stars that should die within their natal OB associations; and 3) electron-capture SNe from super-AGB stars with dense CSM envelopes. To resolve the uncertain origin of SNe IIn-P, we propose a simple and inexpensive optical imaging experiment to see if there is a luminous surviving star remaining at the site. UV imaging is also proposed to determine the nature of a UV source detected in pre-explosion GALEX images, and to survey the progenitor's environment for sibling O-type stars. WFC3/UVIS exposures will be obtained through filters F275W, F438W, F555W, and F814W. This is a 3-orbit program. The F275W and F438W exposures will each require 1 orbit. The F555W and F814 exposures will both be obtained within the 3rd orbit. For all images the ACCUM mode will be used using the default CR-SPLIT=2 for cosmic ray removal. The optimal UVIS aperture will define the pointing center of the full-frame images. All exposures will receive a post-flash of 12e- to mitiagte the effects of the charge transfer efficiency. Stellar Physics 12 false true false false false false SUPPORTED EXT-STAR SUPERNOVA 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 F438W WFC3/UVIS Imaging No No F555W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 1 false /private/var/folders/ks/llz639qd3n9g91642hnd6zyc0000gn/T/OPVisit316383803274845639.xml The scheduling data was generated by CASM 24.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14614 :visit-id "01" :proposal-version -1 :trans-version "20160601" :date "12-Sep-2016 17:02:28.0" :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 2309952 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14614 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14614 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3068 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3403 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14614 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3180 :al-overhead-at-end 122 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3403 :pcs-gap 0 ) (Tic-Orbit :proposal-id 14614 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3181 :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 3403 :pcs-gap 0 ) true 3 0