13351( 4) - 16-Mar-2014 22:29:00 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13351 Version: 4 Check-in Time: 16-Mar-2014 22:29:00 STScI Edit Number: 0 Title UV Spectroscopy of a Peculiar White Dwarf Supernova ------------------------------------------------------------------------------------ Type Cycle GO 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Saurabh W. Jha Rutgers the State University of New Jersey Y CoI: Mr. Curtis McCully Rutgers the State University of New Jersey N CoI: Dr. Ryan Foley University of Illinois at Urbana - N Champaign CoI: Dr. Peter Garnavich University of Notre Dame N ------------------------------------------------------------------------------------ Abstract While type Ia supernovae (SNe Ia) have been extremely useful for studying the cosmic expansion history, their explosion mechanism and progenitor system remain unsolved problems. Moreover, as large samples of SNe are observed, the diversity among these explosions has grown: not all exploding white dwarfs look like normal SNe Ia. Understanding why these "peculiar" objects are different from the normal ones can help explain the standard SN Ia scenario, as well as give us a better understanding of the many endpoints of stellar evolution. Connecting observations to physical models has been difficult for both normal and peculiar white dwarf supernovae. The ultraviolet is a largely unexplored wavelength region for peculiar SNe Ia; the high opacity in the UV from typical thermonuclear burning products means that the UV flux in white dwarf supernovae is very sensitive to the outermost layers of ejecta. This material is the least processed, and is thus an ideal place to look for clues to progenitors and explosion mechanisms. Here we propose to take advantage of the Cycle 21 UV Initiative to obtain target-of-opportunity STIS UV spectroscopy of a peculiar white dwarf supernova to add a unique piece of the puzzle connecting peculiar SNe Ia and their progenitors. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our goal is to observe a single peculiar white-dwarf supernova using the STIS CCD for optical spectra and the STIS NUV_MAMA instrument for the near-UV. Many peculiar SNe Ia are faint, so we will restrict ourselves to low redshift events (z < 0.03). Peculiar SNe Ia evolve differently in the UV than their normal counterparts; we will therefore have two visits on our object. The first will be 2 of our 6 allotted orbits, with approximately half of an orbit being used for the optical spectrum using the STIS CCD, and the other 1.5 orbits being used for the STIS NUV-MAMA spectrum. This visit should cover the SN at maximum or prefereably a few days before maximum. By the time of the second visit, the SN will have faded considerably. The second visit will consist of 4 orbits: 0.5 orbits for the STIS CCD optical spectrum and 3.5 orbits with the NUV-MAMA instrument. We request that the second visit be scheduled approximately 1 week after the initial visit. Real Time Justification 13351( 4) - 16-Mar-2014 22:29:00 - [ 2] ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13351( 4) - 16-Mar-2014 22:29:00 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-MRK1309 STAR, SUPERNOVA, RA=11H57M44.4400S +/- 0.2", J2000 V = 15 +/- 1.0 SUPERNOVA TYPE IA DEC=-10D10'15.70" +/- 0.2" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13351( 4) - 16-Mar-2014 22:29:00 - [ 4] Visit: 01 Visit Requirements: SCHED 90%; ON HOLD ; TOO RESPONSE TIME 2.0D On Hold Comments: Target of Opportunity 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-MRK1309 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-MRK1309 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2167 S POS TARG 0.0, 0.5 -MAMA (2167 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-MRK1309 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1311 S POS TARG 0.0, 0.0 -MAMA (1311 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-MRK1309 STIS/CCD ACCUM 52X0.2 G430L 4300 CR-SPLIT=2 1 400 S (400 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-MRK1309 STIS/CCD ACCUM 52X0.2 G750L 7751 CR-SPLIT=2 1 400 S (400 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.2 G750L 7751 2 DEF (0 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-MRK1309 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN-MRK1309 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA SN-MRK1309 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA SN-MRK1309 4 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none 1 2 N/A SN-MRK1309 4 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none 2 2 N/A SN-MRK1309 5 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 1 2 N/A SN-MRK1309 5 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.2 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.2 G750L 7751 none none 2 none 2 N/A 13351( 4) - 16-Mar-2014 22:29:00 - [ 5] Visit: 02 Visit Requirements: SCHED 90%; AFTER 01 BY 4 D TO 9 D; ON HOLD ; TOO RESPONSE TIME 2.0D On Hold Comments: Target of Opportunity 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-MRK1309 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN-MRK1309 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2167 S POS TARG 0.0, 0.0 -MAMA (2167 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN-MRK1309 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2779 S POS TARG 0.0, -0.5 -MAMA (2779 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN-MRK1309 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2779 S POS TARG 0.0, 0.5 -MAMA (2779 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN-MRK1309 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1096 S POS TARG 0.0, 0.0 -MAMA (1096 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN-MRK1309 STIS/CCD ACCUM 52X0.2 G430L 4300 CR-SPLIT=2 1 700 S (700 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 SN-MRK1309 STIS/CCD ACCUM 52X0.2 G750L 7751 CR-SPLIT=2 1 400 S (400 S) ------------------------------------------------------------------------------------------------------------------------------------ 8 CCDFLAT STIS/CCD ACCUM 52X0.2 G750L 7751 2 DEF (0 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-MRK1309 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN-MRK1309 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA SN-MRK1309 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA SN-MRK1309 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 3 N/A -MAMA SN-MRK1309 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 4 N/A -MAMA SN-MRK1309 6 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none 1 4 N/A SN-MRK1309 6 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none 2 4 N/A SN-MRK1309 7 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 1 4 N/A SN-MRK1309 7 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 2 4 N/A 13351( 4) - 16-Mar-2014 22:29:00 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CCDFLAT 8 STIS/CCD ACCUM 52X0.2 G750L 7751 none none 1 none 4 N/A CCDFLAT 8 STIS/CCD ACCUM 52X0.2 G750L 7751 none none 2 none 4 N/A 13351( 4) - 16-Mar-2014 22:29:00 - [ 7] Summary Form for Proposal 13351 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 4 D TO 9 D, ON HOLD , POS TARG 0.0, -0.5, POS TARG 0.0, 0.0, POS TARG 0.0, 0.5, SCHED 90%, TOO RESPONSE TIME 2.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, SN-MRK1309 ------------------------------------------------------------------------------------------------------------------------------------