14614( 4) - 13-Sep-2016 13:53:01 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14614 Version: 4 Check-in Time: 13-Sep-2016 13:53:01 STScI Edit Number: 0 Title Death or Survival? Determining the nature of SNe IIn-P explosions ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Jon Mauerhan University of California - Berkeley Y CoI: Dr. Nathan Smith University of Arizona N CoI: Dr. Ori Dosovitz Fox Space Telescope Science Institute N CoI: Prof. Alex V. Filippenko University of California - Berkeley N ------------------------------------------------------------------------------------ Abstract 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. ------------------------------------------------------------------------------------ Observations Description ------------------------ 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. ------------------------------------------------------------------------------------ 14614( 4) - 13-Sep-2016 13:53:01 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-2011HT EXT-STAR, SUPERNOVA RA=10H08M10.5800S, J2000 V = 25.5 +/- .5 DEC=+51D50'57.10" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 14614( 4) - 13-Sep-2016 13:53:01 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 14614( 4) - 13-Sep-2016 13:53:01 - [ 4] Visit: 01 Visit Requirements: PCS MODE FINE On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-2011HT WFC3/UVI ACCUM UVIS F438W 1 1481 S PATTERN 1 1 S see below (2932 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-2011HT WFC3/UVI ACCUM UVIS F275W FLASH=9 1 1519 S PATTERN 1 2 S (3038 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-2011HT WFC3/UVI ACCUM UVIS F555W 1 700 S PATTERN 1 3 S see below (1386 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-2011HT WFC3/UVI ACCUM UVIS F814W 1 1150 S PATTERN 1 4 S see below (1386 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SN-2011HT 1 WFC3/UVI ACCUM UVIS F438W 1 none none none 1 1466.0 S S SN-2011HT 1 WFC3/UVI ACCUM UVIS F438W 2 none none none 1 1466.0 S S SN-2011HT 2 WFC3/UVI ACCUM UVIS F275W 1 none none none 2 N/A S SN-2011HT 2 WFC3/UVI ACCUM UVIS F275W 2 none none none 2 N/A S SN-2011HT 3 WFC3/UVI ACCUM UVIS F555W 1 none none none 3 693.0 S S SN-2011HT 3 WFC3/UVI ACCUM UVIS F555W 2 none none none 3 693.0 S S SN-2011HT 4 WFC3/UVI ACCUM UVIS F814W 1 none none none 3 693.0 S S SN-2011HT 4 WFC3/UVI ACCUM UVIS F814W 2 none none none 3 693.0 S S 14614( 4) - 13-Sep-2016 13:53:01 - [ 5] Summary Form for Proposal 14614 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=9 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 1 4, PCS MODE FINE ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F275W, F438W, F555W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-2011HT ------------------------------------------------------------------------------------------------------------------------------------