17170( 8) - 26-Jun-2023 21:08:23 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17170 Version: 8 Check-in Time: 26-Jun-2023 21:08:23 STScI Edit Number: 1 Title Measuring the Effect of Progenitor Metallicity on Type Ia Supernova Distance Estimates ------------------------------------------------------------------------------------ Type Cycle GO 30 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Matthew Ryan Siebert Space Telescope Science Institute Y CoI: Prof. Ryan Foley University of California - Santa Cruz N CoI: Kyle Davis University of California - Santa Cruz N CoI: Dr. Georgios Dimitriadis University of Dublin, Trinity College N CoI: Prof. Alex V. Filippenko University of California - Berkeley N CoI: Dr. Ori Dosovitz Fox Space Telescope Science Institute N CoI: David Oscar Jones NOIRLab - Gemini North (HI) N CoI: Prof. Robert P. Kirshner California Institute of Technology N CoI: Yen-Chen Pan National Central University N CoI: Prof. Friedrich Roepke Universitat Heidelberg N CoI: Mr. Cesar Rojas-Bravo University of California - Santa Cruz N CoI: Dr. Stuart A. Sim The Queen's University of Belfast N CoI: Dr. Stefan Taubenberger Max Planck Institute for Astrophysics N CoI: Dr. J. Craig Wheeler University of Texas at Austin N ------------------------------------------------------------------------------------ Abstract Despite using Type Ia supernovae (SN Ia) to precisely measure cosmological parameters, we do not know basic facts about the progenitor systems and explosions. Theory suggests that SN Ia progenitor metallicity is correlated with peak luminosity, but not how quickly it fades, which we use to calibrate the luminosity and measure distances. This effect should lead to an increased Hubble scatter, reducing the precision with which we measure distances. If the mean progenitor metallicity changes with redshift or population, cosmological measurements such as the dark energy equation-of-state parameter and the Hubble constant could be biased. Models also indicate that changing progenitor metallicity will have little effect on the appearance of optical/NIR SN data, but significantly alter UV spectra. These data can only be obtained with HST. HST observations of 2 "twin" SN (having nearly identical optical spectra and light-curve shapes) with different UV spectra and peak optical luminosities indicate progenitor metallicity differences consistent with models. The current sample of SN Ia with near-peak spectra is siginificantly lacking in its representation of high-velocity (HV) SN Ia. To determine the overall impact of progenitor metallicity on cosmological measurements, we must increase this sample. The community now discovers ~20 SN Ia each year >2 weeks before peak. With the increased discovery rate of young SN, we can expect to observe 4 HV SN Ia in the UV in a single Cycle and constrain how velocity affects the diversity of SN Ia UV properties. This is our best opportunity to further our understanding of SN Ia while directly improving the utility of SN Ia for cosmology. ------------------------------------------------------------------------------------ 17170( 8) - 26-Jun-2023 21:08:23 - [ 2] Observations Description ------------------------ There are 4 separate TOO targets, each will obtain a single spectrum. Each of these targets will require 2 orbits. Fast turn around is important, and we will work closely to speed this process up. Some tweaking to the visits will be required for each trigger. ------------------------------------------------------------------------------------ 17170( 8) - 26-Jun-2023 21:08:23 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2023BEE EXT-STAR, SUPERNOVA RA=08H56M11.6400S, J2000 V = 13 TYPE IA DEC=-03D19'31.91" Reference Frame: ICRS Comments: Rising SN Ia ------------------------------------------------------------------------------------------------------------------------------------ 6 SN2023GFT EXT-STAR, SUPERNOVA RA=21H26M1.3200S, J2000 V = 14 TYPE IA DEC=-03D47'53.65" Reference Frame: ICRS Comments: Rising SN Ia ------------------------------------------------------------------------------------------------------------------------------------ 7 SN2023LNH EXT-STAR, SUPERNOVA RA=00H34M2.2400S, J2000 V = 14.5 TYPE IA DEC=-09D42'14.20" Reference Frame: ICRS Comments: Rising SN Ia ------------------------------------------------------------------------------------------------------------------------------------ 17170( 8) - 26-Jun-2023 21:08:23 - [ 4] TARGET LIST Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN1 EXT-STAR, SUPERNOVA TOO V = 15 TYPE IA ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2 EXT-STAR, SUPERNOVA TOO V = 15 TYPE IA ------------------------------------------------------------------------------------------------------------------------------------ 3 SN3 EXT-STAR, SUPERNOVA TOO V = 15 TYPE IA ------------------------------------------------------------------------------------------------------------------------------------ 4 SN4 EXT-STAR, SUPERNOVA TOO V = 15 TYPE IA ------------------------------------------------------------------------------------------------------------------------------------ 17170( 8) - 26-Jun-2023 21:08:23 - [ 5] Visit: 01 Visit Requirements: SCHED 70%; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Activate upon discovery of first viable target 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 SN2023BEE STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023BEE STIS/NUV ACCUM 52X0.2 G230L 2376 1 2170 S -MAMA see below (2170 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023BEE STIS/NUV ACCUM 52X0.2 G230L 2376 1 1420 S -MAMA see below (1420 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2023BEE STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2023BEE STIS/CCD ACCUM 52X0.2E1 G750L 7751 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.1 G750L 7751 2 25 S (50 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023BEE 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023BEE 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2170 S -MAMA SN2023BEE 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 1420 S -MAMA SN2023BEE 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 2 N/A SN2023BEE 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 2 N/A SN2023BEE 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 1 2 N/A SN2023BEE 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 2 none 2 N/A 17170( 8) - 26-Jun-2023 21:08:23 - [ 6] Visit: 02 Visit Requirements: SCHED 70%; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Activate upon discovery of second viable target 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 SN2023GFT STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023GFT STIS/NUV ACCUM 52X0.2 G230L 2376 1 2170 S -MAMA see below (2170 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023GFT STIS/NUV ACCUM 52X0.2 G230L 2376 1 1420 S -MAMA see below (1420 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2023GFT STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2023GFT STIS/CCD ACCUM 52X0.2E1 G750L 7751 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.1 G750L 7751 2 25 S (50 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023GFT 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023GFT 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2170 S -MAMA SN2023GFT 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 1420 S -MAMA SN2023GFT 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 2 N/A SN2023GFT 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 2 N/A SN2023GFT 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 1 2 N/A SN2023GFT 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 2 none 2 N/A 17170( 8) - 26-Jun-2023 21:08:23 - [ 7] Visit: 03 Visit Requirements: SCHED 70%; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Activate upon discovery of third viable target 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 SN2023LNH STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023LNH STIS/NUV ACCUM 52X0.2 G230L 2376 1 2168 S -MAMA see below (2168 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023LNH STIS/NUV ACCUM 52X0.2 G230L 2376 1 1418 S -MAMA see below (1418 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2023LNH STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2023LNH STIS/CCD ACCUM 52X0.2E1 G750L 7751 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.1 G750L 7751 2 25 S (50 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023LNH 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023LNH 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2168 S -MAMA SN2023LNH 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 1418 S -MAMA SN2023LNH 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 2 N/A SN2023LNH 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 2 N/A SN2023LNH 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 1 2 N/A SN2023LNH 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 2 none 2 N/A 17170( 8) - 26-Jun-2023 21:08:23 - [ 8] Visit: 04 Visit Requirements: ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Activate upon discovery of fourth viable target 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 SN4 STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN4 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2100 S -MAMA (2100 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN4 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1400 S -MAMA (1400 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN4 STIS/CCD ACCUM 52X0.2E1 G750L 7751 CR-SPLIT=2 1 200 S (200 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X0.1 G750L 7751 2 25 S (50 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN4 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN4 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA SN4 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA SN4 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 2 N/A SN4 4 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 2 N/A SN4 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 1 2 N/A SN4 5 STIS/CCD ACCUM 52X0.2E1 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none 2 none 2 N/A 17170( 8) - 26-Jun-2023 21:08:23 - [ 9] Summary Form for Proposal 17170 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.1, 52X0.2, 52X0.2E1, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD , SCHED 70%, TOO RESPONSE TIME 21.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, SN2023BEE, SN2023GFT, SN2023LNH, SN4 ------------------------------------------------------------------------------------------------------------------------------------