17610( 3) - 21-Feb-2024 14:24:39 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17610 Version: 3 Check-in Time: 21-Feb-2024 14:24:39 STScI Edit Number: 1 Title Late time UV spectroscopy of SN 2023ixf in M101: Unique constraints on the progenitor mass loss history ------------------------------------------------------------------------------------ Type Cycle GO/DD 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Stefano Valenti University of California - Davis Y CoI: Dr. Kyra Azalee Bostroem University of Arizona Y CoI: Prof. David J. Sand University of Arizona Y CoI: Dr. Aravind Pazhayath Ravi University of California - Davis Y CoI: Mr. Yize Dong University of California - Davis N CoI: Dr. Griffin Hosseinzadeh University of Arizona N CoI: Dr. Michael Jon Lundquist California Association for Research in N Astronomy (CARA) CoI: Dr. Jennifer Andrews Gemini Observatory N CoI: Jeniveve Pearson University of Arizona N ------------------------------------------------------------------------------------ Abstract We request 10 orbits of HST STIS UV spectroscopy to observe the nearby type IIP supernova 2023ixf in order to trace the late-time interaction between the ejecta and surrounding circumstellar material (CSM). Observations of nearby core collapse (CC) supernovae can teach us about the final years of massive stars in the run-up to their explosion, a portion of stellar evolution that is difficult to model. Some recent observations of type II supernovae have shown evidence for strong CSM interaction, implying that the red supergiant (RSG) progenitor star experienced 10^-3-10^-1 solar masses/year of mass loss in their final months, far higher than the 10^-6 solar masses/year seen in RSGs. To try to reconcile these measurements, observations in the nebular-phase are necessary (>=300 days) to probe material that was blown off the progenitor star decades before explosion. For this task, ultraviolet (UV) observations are more sensitive than the optical, where models predict strong Lyman alpha and MgII emission to trace CSM interaction strength. The recent discovery of SN2023ixf in M101 (~6.4 Mpc) gives us a unique chance to trace mass loss to late phases when the CSM interaction dominates in the ultraviolet. HST observations have shown that SN2023ixf, in the UV, experienced clear CSM interaction through 200 days after explosion. This non-disruptive ToO will observe SN2023ixf 300-400 days after explosion and complete our understanding of the mass loss and CSM interaction for a typical type IIP supernova. Given how close SN2023ixf is and the lifetime of HST, this is probably the finally opportunity to fill a crucial gap in our knowledge of the evolution of CC supernovae in the UV. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal will be triggered on SN 2023ixf a nearby SN discovered on 19 May 2023. We will observe the SN with STIS FUV-MAMA G140L observation with the 52x0.2" slit and STIS NUV-MAMA G230L observation with the 52x0.2" slit. 17610( 3) - 21-Feb-2024 14:24:39 - [ 2] The observations should be scheduled between March and April 2024 in the first window of observation to monitor the supernova at the appropriate phase and to ensure available guide stars for this field. Please execute all the visits as close as possible in time of so that we are able to combine this data for a time-varying object Ideally last visit should be within 3 weeks from first visit. visit 1 STIS FUV-MAMA G140L 2 orbits visit 2 STIS FUV-MAMA G140L 2 orbits visit 3 STIS FUV-MAMA G140L 2 orbits visit 4 STIS FUV-MAMA G230L 2 orbits visit 5 STIS FUV-MAMA G230L 2 orbits ------------------------------------------------------------------------------------ 17610( 3) - 21-Feb-2024 14:24:39 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2023IXF EXT-STAR, SUPERNOVA RA=14H03M38.5640S, J2000 V = 19 TYPE II DEC=+54D18'42.00" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17610( 3) - 21-Feb-2024 14:24:39 - [ 4] Visit: 01 (visit_1_G140) Visit Requirements: SCHED 100%; BETWEEN 21-FEB-2024:00:00:00 AND 30-APR-2024:00:00:00 On Hold Comments: Additional Comments: This is visit 1 of 5 that should be executed as close as possible in time to previous visit. 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 SN2023IXF STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023IXF STIS/FUV ACCUM 52X0.2 G140L 1425 1 3000 S -MAMA see below (1994 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023IXF STIS/FUV ACCUM 52X0.2 G140L 1425 1 3000 S -MAMA see below (2506 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023IXF 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023IXF 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 1 1994.0 S -MAMA SN2023IXF 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 2 2506.0 S -MAMA 17610( 3) - 21-Feb-2024 14:24:39 - [ 5] Visit: 02 (visit_2_G140) Visit Requirements: SCHED 100%; AFTER 01 BY 0 D TO 14 D; BETWEEN 21-FEB-2024:00:00:00 AND 30-APR-2024:00:00:00 On Hold Comments: Additional Comments: This is visit 2 of 5 that should be executed as close as possible in time to previous visit. 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 SN2023IXF STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023IXF STIS/FUV ACCUM 52X0.2 G140L 1425 1 3000 S -MAMA see below (1994 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023IXF STIS/FUV ACCUM 52X0.2 G140L 1425 1 3000 S -MAMA see below (2506 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023IXF 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023IXF 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 1 1994.0 S -MAMA SN2023IXF 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 2 2506.0 S -MAMA 17610( 3) - 21-Feb-2024 14:24:39 - [ 6] Visit: 03 (visit_3_G140) Visit Requirements: SCHED 100%; AFTER 01 BY 0 D TO 14 D; BETWEEN 21-FEB-2024:00:00:00 AND 30-APR-2024:00:00:00 On Hold Comments: Additional Comments: This is visit 3 of 5 that should be executed as close as possible in time to previous visit. 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 SN2023IXF STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023IXF STIS/FUV ACCUM 52X0.2 G140L 1425 1 3000 S -MAMA see below (1994 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023IXF STIS/FUV ACCUM 52X0.2 G140L 1425 1 3000 S -MAMA see below (2506 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023IXF 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023IXF 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 1 1994.0 S -MAMA SN2023IXF 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 2 2506.0 S -MAMA 17610( 3) - 21-Feb-2024 14:24:39 - [ 7] Visit: 04 (visit_4_G230) Visit Requirements: SCHED 100%; BETWEEN 21-FEB-2024:00:00:00 AND 30-APR-2024:00:00:00 On Hold Comments: Additional Comments: This is visit 4 of 5 that should be executed as close as possible in time to previous visit. 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 SN2023IXF STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023IXF STIS/NUV ACCUM 52X0.2 G230L 2376 1 3000 S -MAMA see below (1994 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023IXF STIS/NUV ACCUM 52X0.2 G230L 2376 1 3000 S -MAMA see below (2506 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023IXF 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023IXF 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1994.0 S -MAMA SN2023IXF 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2506.0 S -MAMA 17610( 3) - 21-Feb-2024 14:24:39 - [ 8] Visit: 05 (visit_5_G230) Visit Requirements: SCHED 100%; AFTER 04 BY 0 D TO 14 D; BETWEEN 21-FEB-2024:00:00:00 AND 30-APR-2024:00:00:00 On Hold Comments: Additional Comments: This is visit 5 of 5 that should be executed as close as possible in time to previous visit. 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 SN2023IXF STIS/CCD ACQ F28X50LP MIRROR 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2023IXF STIS/NUV ACCUM 52X0.2 G230L 2376 1 3000 S -MAMA see below (1994 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2023IXF STIS/NUV ACCUM 52X0.2 G230L 2376 1 3000 S -MAMA see below (2506 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2023IXF 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2023IXF 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1994.0 S -MAMA SN2023IXF 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2506.0 S -MAMA 17610( 3) - 21-Feb-2024 14:24:39 - [ 9] Summary Form for Proposal 17610 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 0 D TO 14 D, AFTER 04 BY 0 D TO 14 D, BETWEEN 21-FEB-2024:00:00:00 AND 30-APR-2024:00:00:00, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2023IXF ------------------------------------------------------------------------------------------------------------------------------------