10098( 2) - 05/07/04 09:50 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 10098 Version: 2 Check-in Date: 07-May-2004 13:46:21 1.Proposal Title: Probing the nature of Type Ia SNe through HST astrometry ------------------------------------------------------------------------------------ 2. Proposal For 3. Cycle 4. Parallel Pointing Tolerance GO 13 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Prof. Pilar Ruiz-Lapuente University of Barcelona CoI: Prof. Adam Seth Burrows University of Arizona N CoI: Prof. Ramon Canal University of Barcelona N CoI: Mr. Ryan Chornock University of California - Berkeley N CoI: Dr. Fernando Comeron European Southern Observatory - Germany N CoI: Prof. Alex V. Filippenko University of California - Berkeley N CoI: Dr. Roberto Mignani European Southern Observatory - Germany N CoI: Dr. Robert L. Kurucz Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ 6. Abstract Type Ia supernovae are of key importance in cosmology. Empirical relations allow their use as cosmological standard candles. The generally accepted picture is that the exploding star is a C+O white dwarf which accretes matter from a companion in a binary system. However, the nature of the companion is still unknown. It could either be another WD, or be a giant, subgiant, or main-sequence star. Calculations have shown that it is possible to distinguish among those possibilities by the effect that the supernova explosion has on the companion star. We propose to identify the companion star of the two historical well-known SNeIa through ACS imaging of the targets complemented by WFPC2 observations. A radial-velocity study of the stars in those two Galactic SNeIa has been done from ground-based facilities. To obtain the full motion vector of those stars, we plan to use ACS for high- resolution astrometry in two different epochs. That should allow to detect motion imparted during the explosion in the d ir ection perpendicular to the line of sight, down to a level of a few milliarcsecs/yr. ------------------------------------------------------------------------------------ 10098( 2) - 05/07/04 09:50 - [ 2] Observations Description ------------------------ We plan to devote 3 orbits of our 6 orbits in Cycle 12 (each orbit is 1 visit of a target) to WFPC2 observations of the fields of SN 1572 and SN 1006 - these observations will be coupled to the archived WFPC2 ones for SN 1572 (Tycho SN) and SN 1006 done in 1999 in Cycle 6. From the 3 orbits (=3 visits) with WFPC2, 2 will go to Tycho and 1 to SN 1006 (this choice is justified for the better use that one can make of the archived images of SN 1572 and the need to get as good proper motion measurements as possible due to its distance). Proper motions measurements down to 1 mas yr-1 would be achieved for the 70$\%$ of the candidates (unsaturated candidates in archived images). The other three orbits (corresponding to 2 visits) in Cycle 12 (1 orbit for Tycho and 2 orbits for SN 1006) plus the six orbits in Cycle 13 using the ACS/WFC would serve to provide proper motions to the level of 3-4 mas yr-1 for the rest of the stars in SN 1572 and SN 1006. The combination of the different visits done to the targets along Cycle 12 and 13 should ensure that the result proposed in the programme is achieved. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 10098( 2) - 05/07/04 09:50 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-1572A- STAR, SUPERNOVA TYPE IA RA=00H25M18.5S +/- 0.1", J2000 V = 14.0 WFPC2 DEC=+64D08'8.6" +/- 0.1", PLATE- ID=01YC Coordinate Source: GUIDE_STAR_CATALOG 2 SN-1572A-ACS STAR, SUPERNOVA TYPE IA RA=00H25M19.9S +/- 0.1", J2000 V = 14.0 DEC=+64D08'18.2" +/- 0.1", PLATE-ID=01YC Coordinate Source: GUIDE_STAR_CATALOG 3 SN-1006 STAR, SUPERNOVA TYPE IA RA=15H02M55.0S +/- 0.1", DEC=- J2000 V = 14.0 41D55'12.0" +/- 0.1", PLATE- ID=02F5 Coordinate Source: GUIDE_STAR_CATALOG 10098( 2) - 05/07/04 09:50 - [ 4] Visit: 06 Visit Priority: Visit Requirements: PCS MODE FINE; CVZ 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 SN-1572A-WF WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 4 400 S PC2 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1572A-WF WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 6 1 S PC2 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1572A-WF WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 6 0.2 S PC2 ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-1572A-WF WFPC2 IMAGE WF3-FIX F555W CR-SPLIT=NO 5 100 S PC2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 06 1 none none 1 none tbd tbd 06 1 none none 2 none tbd tbd 06 1 none none 3 none tbd tbd 06 1 none none 4 none tbd tbd 06 2 none none 1 none tbd tbd 06 2 none none 2 none tbd tbd 06 2 none none 3 none tbd tbd 06 2 none none 4 none tbd tbd 06 2 none none 5 none tbd tbd 06 2 none none 6 none tbd tbd 06 3 none none 1 none tbd tbd 06 3 none none 2 none tbd tbd 06 3 none none 3 none tbd tbd 06 3 none none 4 none tbd tbd 06 3 none none 5 none tbd tbd 06 3 none none 6 none tbd tbd 06 4 none none 1 none tbd tbd 06 4 none none 2 none tbd tbd 06 4 none none 3 none tbd tbd 06 4 none none 4 none tbd tbd 06 4 none none 5 none tbd tbd 10098( 2) - 05/07/04 09:50 - [ 5] Visit: 07 Visit Priority: Visit Requirements: PCS MODE FINE; CVZ 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 SN-1572A-AC ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=4 1 1440 S S ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1572A-AC ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 0.5 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1572A-AC ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 10 S S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 07 1 none none none 1 tbd tbd 07 1 none none none 2 tbd tbd 07 1 none none none 3 tbd tbd 07 1 none none none 4 tbd tbd 07 2 none none 1 none tbd tbd 07 2 none none 2 none tbd tbd 07 2 none none 3 none tbd tbd 07 3 none none 1 none tbd tbd 07 3 none none 2 none tbd tbd 07 3 none none 3 none tbd tbd 10098( 2) - 05/07/04 09:50 - [ 6] Visit: 08 Visit Priority: Visit Requirements: PCS MODE FINE; CVZ; AFTER 07 BY 200 D TO 300 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 SN-1572A-AC ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=4 1 1440 S S ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1572A-AC ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 0.5 S S ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1572A-AC ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 10 S S ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 08 1 none none none 1 tbd tbd 08 1 none none none 2 tbd tbd 08 1 none none none 3 tbd tbd 08 1 none none none 4 tbd tbd 08 2 none none 1 none tbd tbd 08 2 none none 2 none tbd tbd 08 2 none none 3 none tbd tbd 08 3 none none 1 none tbd tbd 08 3 none none 2 none tbd tbd 08 3 none none 3 none tbd tbd 10098( 2) - 05/07/04 09:50 - [ 7] Visit: 09 Visit Priority: 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SN-1006 ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 0.5 S ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1006 ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 10 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 09 1 none none 1 none 1 39.5 09 1 none none 2 none 1 39.5 09 1 none none 3 none 1 39.5 09 2 none none 1 none 1 39.0 09 2 none none 2 none 1 39.0 09 2 none none 3 none 1 39.0 10098( 2) - 05/07/04 09:50 - [ 8] Visit: 10 Visit Priority: Visit Requirements: PCS MODE FINE; AFTER 09 BY 200 D TO 300 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 SN-1006 ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=5 1 2000 S ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-1006 ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 0.5 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-1006 ACS/WFC ACCUM WFC2-FIX F555W CR-SPLIT=NO 3 10 S SAME POS AS 1 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Visit Id| Exp Id |Primary |Secondary |Iteration |CR-SPLIT |Orbit Num |Duration | |Pattern Pos |Pattern Pos |Num |Num | | ------------------------------------------------------------------------------------------------------------------------------------ 10 1 none none none 1 1 429.0 10 1 none none none 2 1 429.0 10 1 none none none 3 1 429.0 10 1 none none none 4 1 429.0 10 1 none none none 5 1 429.0 10 2 none none 1 none 2 59.5 10 2 none none 2 none 2 59.5 10 2 none none 3 none 2 59.5 10 3 none none 1 none 2 69.0 10 3 none none 2 none 2 69.0 10 3 none none 3 none 2 69.0 10098( 2) - 05/07/04 09:50 - [ 9] Summary Form for Proposal 10098 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WF3-FIX WFC2-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFPC2 ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes IMAGE ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO CR-SPLIT=4 CR-SPLIT=5 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE; CVZ PCS MODE FINE; CVZ; AFTER 07 BY 200 D TO 300 D PCS MODE FINE SAME POS AS 1 PCS MODE FINE; AFTER 09 BY 200 D TO 300 D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F555W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN-1572A-WFPC2 SN-1572A-ACS SN-1006 ------------------------------------------------------------------------------------------------------------------------------------