14800( 4) - 10-Jul-2017 18:36:11 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14800 Version: 4 Check-in Time: 10-Jul-2017 18:36:11 STScI Edit Number: 0 Title Mapping Calcium Rich Ejecta in Two Type Ia Supernovae ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Robert A. Fesen Dartmouth College Y CoI: Dr. Peter A. Hoeflich Florida State University N CoI: Dr. Andrew J. S. Hamilton University of Colorado at Boulder N CoI: Ms. Christine Black Dartmouth College N CoI: Ms. Kathryn Weil Dartmouth College N ------------------------------------------------------------------------------------ Abstract Type Ia supernovae (SNe Ia) are thermonuclear explosions of white dwarfs (WDs) in close binary systems with either a non-degenerate or WD companion. SN Ia explosion computations are quite challenging, involving a complex interplay of turbulent hydrodynamics, nuclear burning, conduction, radiative transfer in iron-group rich material and possibly magnetic fields leading to significant uncertainties. Several key questions about expansion asymmetries and the overall characteristics of SNe Ia could be resolved if one could obtain direct observations of the internal kinematics and elemental distributions of young SN Ia remnants. We propose to use WFC3/UVIS to obtain images of the normal Type Ia supernova remnant 0519-69.0 and the overluminous Type Ia supernova remnant 0509-67.5 in the LMC. The Ca II on-band F390M filter and off-band F336W and FQ422M filters will be used to determine the spatial extent and density distributions of the Ca-rich ejecta via resonance line absorption. Differences in the observed on and off band Ca II fluxes for LMC stars located behind these young 400 - 600 yr old remnants will yield calcium column density estimates for multiple lines-of-sight within these remnants. These results will be compared to the calcium distribution seen in SN 1885, a subluminous SN Ia in M31, already imaged by HST. The resulting calcium density distribution maps for both a normal and overluminous SN Ia events will provide powerful insights regarding the structure and kinematics of calcium-rich ejecta in three different type Ia subclass events, and unique empirical data with which to test current SN Ia explosion models. ------------------------------------------------------------------------------------ Observations Description ------------------------ This project aims at imaging two very young Type Ia supernova remnants in the LMC using three WFC3/UVIS filters. The filters are: F390M, the quad filter FQ422M, and F410M in place of the F336W filter. Both targets have angular dimensions around 35 arcseconds. The reason for the change of filters is in response to a discussion of how best to detect the Ca II 3934, 3968 line absorption. Based on available digital spectra of O to M stars, it has become apparent that several G type stars will 14800( 4) - 10-Jul-2017 18:36:11 - [ 2] have fainter continuum at 3700-3900 Ang which will confuse our identification of potential background stars using the F336W filter which covers this wavelength region. A better approach is to replace the F336W filter with the F410M filter, which is immediately adjacent to the passband of the FQ422M filter but will sensitive to redshifted Ca II absorption like that observed in S And (SN 1885) in M31. (I have received notice that this filter swao has been approved by STScI.) NOTE: REVISION MADE: 7 JULY 2017 - Due to recent ground-based observations, we have replaced the three filters for target 0519-690 to just two filters, namely F225W and F336W so as to detect the remnant's Fe-rich ejecta via strong Fe II absorptions in the F225W bandpass. NOTE: 3rd REVISION: 10 JULY 2017: decreased exposures by 5 seconds (from 730 s to 725) to remove ORBIT VISIBILITY OVERRUN of 9 sec error. Re-ran orbit planner and visit planner in Cycle 25 APT. ------------------------------------------------------------------------------------ 14800( 4) - 10-Jul-2017 18:36:11 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SNR-0509-675 ISM, EJECTA RA=05H09M31.0400S, J2000 V = 22 +/- 2 DEC=-67D31'16.50" Reference Frame: ICRS Extended: YES ------------------------------------------------------------------------------------------------------------------------------------ 2 SNR-0519-690 ISM, EJECTA RA=05H19M34.6000S, J2000 V = 22 +/- 2 DEC=-69D02'6.70" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14800( 4) - 10-Jul-2017 18:36:11 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 14800( 4) - 10-Jul-2017 18:36:11 - [ 5] Visit: 01 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 SNR-0509-67 WFC3/UVI ACCUM UVIS2 F390M FLASH=12 1 700 S PATTERN 1 1 5 S (2800 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SNR-0509-67 WFC3/UVI ACCUM UVIS2 F410M FLASH=12 1 725 S PATTERN 1 2 5 S (2900 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SNR-0509-67 WFC3/UVI ACCUM UVIS-QUAD FQ422M FLASH=12 1 725 S PATTERN 1 3 5 S (2900 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 | ------------------------------------------------------------------------------------------------------------------------------------ SNR-0509-675 1 WFC3/UVI ACCUM UVIS2 F390M 1 none none none 1 N/A S SNR-0509-675 1 WFC3/UVI ACCUM UVIS2 F390M 2 none none none 1 N/A S SNR-0509-675 1 WFC3/UVI ACCUM UVIS2 F390M 3 none none none 1 N/A S SNR-0509-675 1 WFC3/UVI ACCUM UVIS2 F390M 4 none none none 1 N/A S SNR-0509-675 2 WFC3/UVI ACCUM UVIS2 F410M 1 none none none 2 N/A S SNR-0509-675 2 WFC3/UVI ACCUM UVIS2 F410M 2 none none none 2 N/A S SNR-0509-675 2 WFC3/UVI ACCUM UVIS2 F410M 3 none none none 2 N/A S SNR-0509-675 2 WFC3/UVI ACCUM UVIS2 F410M 4 none none none 2 N/A S SNR-0509-675 3 WFC3/UVI ACCUM UVIS-QUA FQ422M 1 none none none 3 N/A S D SNR-0509-675 3 WFC3/UVI ACCUM UVIS-QUA FQ422M 2 none none none 3 N/A S D SNR-0509-675 3 WFC3/UVI ACCUM UVIS-QUA FQ422M 3 none none none 3 N/A S D SNR-0509-675 3 WFC3/UVI ACCUM UVIS-QUA FQ422M 4 none none none 3 N/A S D 14800( 4) - 10-Jul-2017 18:36:11 - [ 6] Visit: 02 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 SNR-0519-69 WFC3/UVI ACCUM UVIS2 F225W FLASH=12 1 700 S PATTERN 1 1 0 S (2800 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SNR-0519-69 WFC3/UVI ACCUM UVIS2 F225W FLASH=12 1 725 S PATTERN 1 2 0 S (2900 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SNR-0519-69 WFC3/UVI ACCUM UVIS2 F336W FLASH=12 1 725 S PATTERN 1 3 0 S (2900 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 | ------------------------------------------------------------------------------------------------------------------------------------ SNR-0519-690 1 WFC3/UVI ACCUM UVIS2 F225W 1 none none none 1 N/A S SNR-0519-690 1 WFC3/UVI ACCUM UVIS2 F225W 2 none none none 1 N/A S SNR-0519-690 1 WFC3/UVI ACCUM UVIS2 F225W 3 none none none 1 N/A S SNR-0519-690 1 WFC3/UVI ACCUM UVIS2 F225W 4 none none none 1 N/A S SNR-0519-690 2 WFC3/UVI ACCUM UVIS2 F225W 1 none none none 2 N/A S SNR-0519-690 2 WFC3/UVI ACCUM UVIS2 F225W 2 none none none 2 N/A S SNR-0519-690 2 WFC3/UVI ACCUM UVIS2 F225W 3 none none none 2 N/A S SNR-0519-690 2 WFC3/UVI ACCUM UVIS2 F225W 4 none none none 2 N/A S SNR-0519-690 3 WFC3/UVI ACCUM UVIS2 F336W 1 none none none 3 N/A S SNR-0519-690 3 WFC3/UVI ACCUM UVIS2 F336W 2 none none none 3 N/A S SNR-0519-690 3 WFC3/UVI ACCUM UVIS2 F336W 3 none none none 3 N/A S SNR-0519-690 3 WFC3/UVI ACCUM UVIS2 F336W 4 none none none 3 N/A S 14800( 4) - 10-Jul-2017 18:36:11 - [ 7] Summary Form for Proposal 14800 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS-QUAD, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=12 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 1 3 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F225W, F336W, F390M, F410M, FQ422M ------------------------------------------------------------------------------------------------------------------------------------ Target Names SNR-0509-675, SNR-0519-690 ------------------------------------------------------------------------------------------------------------------------------------