14144( 4) - 07-May-2016 00:12:52 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14144 Version: 4 Check-in Time: 07-May-2016 00:12:52 STScI Edit Number: 0 Title An Ultraviolet View of Overluminous Type Ia Supernonovae ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Peter J. Brown Texas A & M University Y ------------------------------------------------------------------------------------ Abstract Type Ia supernova (SNe) are important cosmological tools because of their standardizable luminosities in the optical and near-infrared. Ultraviolet (UV) wavelengths, however, show a great diversity even in normal objects. Though all SNe Ia are UV-faint, a small and heterogeneous group of SNe have UV luminosities ten times larger than the brightest "normal" SNe Ia. We refer to these as UV-bright, even though the spectral energy distribution still peaks in the optical. The origin of this UV flux is uncertain but could result from hotter explosions (with reduced line opacities) or interaction with a companion star or the circumstellar medium. While evidence of such would be important for understanding these standard candles, these scenarios cannot be distinguished by UV photometry alone. We propose to follow up a UV-bright SN Ia (to be identified by Swift/UVOT observations) with HST/STIS to obtain high quality UV spectra near peak brightness. We will use the HST spectra to search for a hot thermal component arising from ejecta-companion or ejecta-CSM interaction. If the UV excess is not caused by a thermal component, the HST spectra can be used to model the elements responsible for the excess UV emission (or lack of absorption). The origin of the UV flux is key to understanding the progenitor star, companion, local environment, or the explosion. The time to understand the physics behind the UV luminosity is now with Swift/UVOT and HST. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will observe for three epochs/visits separated by about 5 days, with 2, 2, and 3 orbits. Each epoch includes 1000 sec in STIS/CCD 52x0.2E1 and the rest in STIS/NUV-MAMA G230L 52x0.2. The target will likely have an optical magnitude V ~16. For the case where the SN is especially nearby and bright, we would like to shorten the observation times in the other epochs and add an observation in the G140L filter to extend the observation to even shorter wavelengths as was done for SN~2011fe. ------------------------------------------------------------------------------------ 14144( 4) - 07-May-2016 00:12:52 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2016CCJ EXT-STAR, SUPERNOVA, RA=17H10M23.9710S +/- 0.2", J2000 Z = 0.03 V = 17.1 +/- 0.1 uvm2=17.8 (Swift/UVOT) SUPERNOVA TYPE IA DEC=+26D23'48.85" +/- 0.2" Reference Frame: ICRS Extended: NO Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0 ------------------------------------------------------------------------------------------------------------------------------------ 14144( 4) - 07-May-2016 00:12:52 - [ 3] Visit: 01 (visit1) Visit Requirements: SCHED 100%; BETWEEN 05-MAY-2016:00:00:00 AND 15-MAY-2016:00:00:00 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 SN2016CCJ STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2016CCJ STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 3 S (3 S) K ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2016CCJ STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 1000 S see below (637 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 1000 S -MAMA see below (922 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 2700 S -MAMA see below (2743 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2016CCJ 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2016CCJ 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K SN2016CCJ 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 215.0 S SN2016CCJ 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 422.0 S SN2016CCJ 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 922.0 S -MAMA SN2016CCJ 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2743.0 S -MAMA 14144( 4) - 07-May-2016 00:12:52 - [ 4] Visit: 02 (visit2) Visit Requirements: SCHED 100%; AFTER 01 BY 5 D TO 8 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 SN2016CCJ STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2016CCJ STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 3 S (3 S) K ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2016CCJ STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 800 S see below (506 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 1200 S -MAMA see below (1053 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 2700 S -MAMA see below (2743 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2016CCJ 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2016CCJ 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K SN2016CCJ 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 253.0 S SN2016CCJ 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 253.0 S SN2016CCJ 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1053.0 S -MAMA SN2016CCJ 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2743.0 S -MAMA 14144( 4) - 07-May-2016 00:12:52 - [ 5] Visit: 03 (visit3) Visit Requirements: SCHED 100%; AFTER 02 BY 5 D TO 8 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 SN2016CCJ STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2016CCJ STIS/CCD ACQ/PEA 52X0.1E1 MIRROR 1 3 S (3 S) K ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2016CCJ STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 1000 S see below (696 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 1000 S -MAMA see below (862 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 2700 S -MAMA see below (2743 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 SN2016CCJ STIS/NUV ACCUM 52X0.2 G230L 2376 1 2700 S -MAMA see below (2743 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2016CCJ 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2016CCJ 2 STIS/CCD ACQ/PEA 52X0.1E1 MIRROR none none none none 1 N/A K SN2016CCJ 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 348.0 S SN2016CCJ 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 348.0 S SN2016CCJ 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 862.0 S -MAMA SN2016CCJ 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2743.0 S -MAMA SN2016CCJ 6 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 3 2743.0 S -MAMA 14144( 4) - 07-May-2016 00:12:52 - [ 6] Summary Form for Proposal 14144 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1E1, 52X0.2, 52X0.2E1, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 5 D TO 8 D, AFTER 02 BY 5 D TO 8 D, BETWEEN 05-MAY-2016:00:00:00 AND 15-MAY-2016:00:00:00, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2016CCJ ------------------------------------------------------------------------------------------------------------------------------------