10892( 3) - 05/16/06 08:48 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 10892 Version: 3 Check-in Time: 16-May-2006 12:47:49 STScI Edit Number: Title Imaging Dust Near Type Ia Supernovae: A New Light Echo Candidate ------------------------------------------------------------------------------------ Type Cycle Parallel Pointing Tolerance GO 15 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Peter Garnavich University of Notre Dame CoI: Mr. Jason Quinn University of Notre Dame N CoI: Dr. Kevin Krisciunas University of Notre Dame N ------------------------------------------------------------------------------------ Abstract Light echos are excellent probes of circumstellar and interstellar dust. We have been using the unique power of light echos to study the progenitors of type Ia supernovae, but currently, only two distant echos are known: SN 1991T and 1998bu. Both events show dust close to the progenitors and the echo light curve suggests that the dust actually surrounds SN 1991T. Here we propose to use HST to confirm a third echo and study its size, brightness and color. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to observe the site of the supernova sn1995E in ngc 2441 with HST/ACS to determine is the source discoverd in eariler snap images is a light echo. 1 orbit F435W 1 orbit F555W Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10892( 3) - 05/16/06 08:48 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN1995E EXT-STAR, SUPERNOVA RA=07H51M56.5400S +/- 0.3", J2000 V = 24.0+/-0.3 TYPE IA DEC=+73D00'35.10" +/- 0.3" Reference Frame: ICRS 10892( 3) - 05/16/06 08:48 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 10892( 3) - 05/16/06 08:48 - [ 4] Visit: 01 Visit Priority: Visit Requirements: SEQ 01, 02 WITHIN 10 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN1995E ACS/WFC ACCUM WFC1 F435W CR-SPLIT=NO 1 560 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN1995E 1 ACS/WFC ACCUM WFC1 F435W 1 none none none 1 N/A SN1995E 1 ACS/WFC ACCUM WFC1 F435W 2 none none none 1 N/A SN1995E 1 ACS/WFC ACCUM WFC1 F435W 3 none none none 1 N/A SN1995E 1 ACS/WFC ACCUM WFC1 F435W 4 none none none 1 N/A 10892( 3) - 05/16/06 08:48 - [ 5] Visit: 02 Visit Priority: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN1995E ACS/WFC ACCUM WFC1 F555W CR-SPLIT=NO 1 560 S PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN1995E 1 ACS/WFC ACCUM WFC1 F555W 1 none none none 1 N/A SN1995E 1 ACS/WFC ACCUM WFC1 F555W 2 none none none 1 N/A SN1995E 1 ACS/WFC ACCUM WFC1 F555W 3 none none none 1 N/A SN1995E 1 ACS/WFC ACCUM WFC1 F555W 4 none none none 1 N/A 10892( 3) - 05/16/06 08:48 - [ 6] Summary Form for Proposal 10892 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements SEQ 01, 02 WITHIN 10 D; PATTERN 1 1; ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F435W F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN1995E ------------------------------------------------------------------------------------------------------------------------------------