15928( 3) - 19-Jul-2019 17:24:16 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15928 Version: 3 Check-in Time: 19-Jul-2019 17:24:16 STScI Edit Number: 2 Title Imaging the transition of SN 1987A to SNR 1987A ------------------------------------------------------------------------------------ Type Cycle GO 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Claes Fransson Stockholm University Y CoI: Dr. Josefin Larsson Royal Institute of Technology N CoI: Prof. Robert P. Kirshner Harvard University N CoI: Mr. Peter Challis Harvard University N CoI: Dr. Roger A. Chevalier The University of Virginia N CoI: Dr. Kevin France University of Colorado at Boulder N CoI: Prof. Peter Lundqvist Stockholm University N CoI: Dr. Jason Spyromilio European Southern Observatory - Germany N CoI: Dr. Richard McCray University of Colorado at Boulder N CoI: Prof. Kevin Heng University of Bern N CoI: Dr. J. Craig Wheeler University of Texas at Austin N CoI: Dr. Stephen S. Lawrence Hofstra University N CoI: Dr. Jesper Sollerman Stockholm University N CoI: Dr. Nicholas B. Suntzeff Texas A & M University N CoI: Mr. Dennis Alp Royal Institute of Technology N CoI: Dr. Seppo Mattila University of Turku N CoI: Dr. George Sonneborn NASA Goddard Space Flight Center N CoI: Ms. Katia Migotto Stockholm University N CoI: Dr. Bruno Leibundgut European Southern Observatory - Germany N ------------------------------------------------------------------------------------ Abstract SN 1987A is the great supernova (SN) of the HST era. An unbroken string of observations is the essential tool for detecting change and establishing a uniform legacy archive. Previous imaging has shown that the SN ejecta has changed from being powered by radioactive 44Ti up to day 5000, to being powered by the X-rays from the ring collision. This is seen both in the light curve and the rapidly changing morphology of the ejecta. As the X-rays penetrate further in we expect the metal rich core to also become illuminated. As the ejecta expand the dust in the center may become transparent and our limits on a compact object will become stronger, or yield a detection. Also the circumstellar ring surrounding the SN is undergoing a dramatic change. After a rapid increase, the flux reached a maximum around day 8000 and is now decaying rapidly. This marks the final destruction of the ring and we estimate that by 2025 it will be dissolved. At the same time, diffuse emission and new hot spots outside the inner ring are becoming visible, providing a tool to study the unknown circumstellar environment outside the ring. Imaging in both narrow and broad bands allow us to follow these developments. The HST observations have a unique blend of photometric fidelity and angular resolution that makes them the indispensable partner to ongoing ground-based, X-ray and sub-mm ALMA observations, providing the morphology of both the inner metal rich core and the H-rich envelope. They will also be a necessary complement to our approved STIS and COS observations and by 2019 also of the JWST GTO observations. This is a long 15928( 3) - 19-Jul-2019 17:24:16 - [ 2] term study: given the rapid change we see, sampling every year is necessary. ------------------------------------------------------------------------------------ Observations Description ------------------------ The WFC3/UVIS observations using filters F438W, F625W, F502N and F657N connect with our earlier observations at similar, or better S/N ratio through drizzled observations. As described above, these new images will allow us to follow the light curve, the morphology of the ejecta, the ring emission as well as new spots and diffuse gas outside the ring. Broad band images: We request imaging with F438W and F625W in all three years. To obtain a similar quality as our previous observations we need half an orbit per filter. This is our request for F438W all three years and for F625W in year one and year three. In year two, we request a significantly deeper observation of 1.5 orbits for F625W. This observation will allow us to probe the faintest structures in the ejecta, ring and reverse shock. Such a deep observation also offers the possibility of detecting previously unseen emission components. The total request for the broad filters is thus 1+2+1=4 orbits. Narrow band images: We request imaging in F502N and F657N in year one and year three only. To obtain similar quality as our previous observations we need two orbits for F502N and one orbit for F657N. ------------------------------------------------------------------------------------ 15928( 3) - 19-Jul-2019 17:24:16 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-1987A EXT-STAR, SUPERNOVA, RA=05H35M28.1000S, J2000 V = 23.0 SUPERNOVA TYPE II DEC=-69D16'11.07" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. frpk our astrometric STIS image 5:35:28.107 -69:16:11.050 fk5 514 503 142.747 ------------------------------------------------------------------------------------------------------------------------------------ 15928( 3) - 19-Jul-2019 17:24:16 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15928( 3) - 19-Jul-2019 17:24:16 - [ 5] Visit: 21 Visit Requirements: BETWEEN 01-JUL-2020:00:00:00 AND 30-SEP-2020:00:00:00; SEQ 21, 22 WITHIN 7 D 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-1987A WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=10 1 290 S PATTERN 1 1-2 S 1C-SUB (1160 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1987A WFC3/UVI ACCUM UVIS2-C1K F625W FLASH=5 1 290 S S 1C-SUB (1160 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-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 N/A S K1C-SUB SN-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 N/A S K1C-SUB SN-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 N/A S K1C-SUB SN-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none none 1 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F625W 1 none none none 1 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F625W 2 none none none 1 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F625W 3 none none none 1 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F625W 4 none none none 1 N/A S K1C-SUB 15928( 3) - 19-Jul-2019 17:24:16 - [ 6] Visit: 22 Visit Requirements: 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-1987A WFC3/UVI ACCUM UVIS2-C1K F502N FLASH=12 1 700 S PATTERN 1 1-3 S 1C-SUB (2800 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1987A WFC3/UVI ACCUM UVIS2-C1K F502N FLASH=12 1 700 S S 1C-SUB (2800 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1987A WFC3/UVI ACCUM UVIS2-C1K F657N FLASH=12 1 720 S S 1C-SUB (2880 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-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F502N 1 none none none 1 N/A S K1C-SUB SN-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F502N 2 none none none 1 N/A S K1C-SUB SN-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F502N 3 none none none 2 N/A S K1C-SUB SN-1987A 1 WFC3/UVI ACCUM UVIS2-C1 F502N 4 none none none 3 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F502N 1 none none none 1 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F502N 2 none none none 2 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F502N 3 none none none 2 N/A S K1C-SUB SN-1987A 2 WFC3/UVI ACCUM UVIS2-C1 F502N 4 none none none 3 N/A S K1C-SUB SN-1987A 3 WFC3/UVI ACCUM UVIS2-C1 F657N 1 none none none 1 N/A S K1C-SUB SN-1987A 3 WFC3/UVI ACCUM UVIS2-C1 F657N 2 none none none 2 N/A S K1C-SUB SN-1987A 3 WFC3/UVI ACCUM UVIS2-C1 F657N 3 none none none 3 N/A S K1C-SUB SN-1987A 3 WFC3/UVI ACCUM UVIS2-C1 F657N 4 none none none 3 N/A S K1C-SUB 15928( 3) - 19-Jul-2019 17:24:16 - [ 7] Summary Form for Proposal 15928 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=12, FLASH=5 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-JUL-2020:00:00:00 AND 30-SEP-2020:00:00:00, PATTERN 1 1-2, PATTERN 1 1-3, SEQ 21, 22 WITHIN 7 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F438W, F502N, F625W, F657N ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-1987A ------------------------------------------------------------------------------------------------------------------------------------