17614( 5) - 14-Aug-2024 15:41:21 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17614 Version: 5 Check-in Time: 14-Aug-2024 15:41:21 STScI Edit Number: 0 Title Exploring the Ultraviolet Evolution of SN 2024ggi: Unveiling Red Supergiant Mass Loss with HST Spectroscopy ------------------------------------------------------------------------------------ Type Cycle GO/DD 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Kyra Azalee Bostroem University of Arizona Y CoI: Prof. David J. Sand University of Arizona N CoI: Dr. Jennifer Andrews NOIRLab - Gemini North (HI) N CoI: Dr. Manisha Shrestha University of Arizona N CoI: Jeniveve Pearson University of Arizona N CoI: Dr. Griffin Hosseinzadeh University of Arizona N CoI: Dr. Stefano Valenti University of California - Davis N CoI: Mr. Nicolas Eduardo Meza Retamal University of California - Davis N CoI: Dr. Michael Jon Lundquist California Association for Research in N Astronomy (CARA) CoI: Mr. Yize Dong University of California - Davis N CoI: Emily Hoang University of California - Davis N CoI: Dr. Aravind Pazhayath Ravi University of California - Davis N ------------------------------------------------------------------------------------ Abstract Hydrogen-rich supernovae, the end phase of massive star evolution, offer critical insights into stellar evolution and the interplay between stars and their surroundings. SN 2024ggi exploded on Apr 10, 2024 in NGC 3621(D=6.5-7.5 Mpc). This nearby event presents a rare opportunity to investigate the interaction between the SN ejecta and circumstellar material in unprecedented detail. Leveraging the unique ultraviolet capabilities of the Hubble Space Telescope (HST), we propose to map the mass loss history of the progenitor star over the its last 25 years by observing the supernova at 10, 20, 50 and 100 days post-explosion. With these observations, we can not only trace the evolution of circumstellar interaction, but also study the elemental composition of the circumstellar material and shed light on the mechanisms driving mass loss in massive stars. By comparing our observations with the extensively studied hydrogen-rich SN 2023ixf, we will determine commonalities and differences in their mass loss processes and their impact on supernova evolution. Beyond fundamental questions in stellar astrophysics this proposal also lays the groundwork for interpreting high-redshift hydrogen-rich supernovae. Additionally, this proposal fills a critical gap in our understanding of of the evolution of hydrogen-rich supernovae as there are only a handful of core-collapse supernovae with HST ultraviolet observations and the majority of them occur within 3 weeks of explosion. Probing the late phases of ultraviolet evolution, after the flux has normally faded can only be done for a supernova this nearby and only with HST. ------------------------------------------------------------------------------------ Observations Description ------------------------ This is a disruptive ToO to monitor the evolution CSM interaction with the ejecta of SN 2024ggi. We request observations at 20, 50, and 100d. Day 20 will be with the STIS/CCD detector to allow rapid schedulability without 17614( 5) - 14-Aug-2024 15:41:21 - [ 2] the need for a BOP review and day 50 and 100 will be with the STIS/NUV detector. We allow the first visit to execute between 15-25d The second and third visit have a +/-10 d window around our preferred epoch ------------------------------------------------------------------------------------ 17614( 5) - 14-Aug-2024 15:41:21 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SN2024GGI EXT-STAR, SUPERNOVA, RA=11H18M22.0870S +/- 0.05", J2000 V = 12.05 SUPERNOVA TYPE II DEC=-32D50'15.27" +/- 0.05" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17614( 5) - 14-Aug-2024 15:41:21 - [ 4] Visit: 01 (Day 20) Visit Requirements: BETWEEN 12-MAY-2024:00:00:00 AND 31-MAY-2024:00:00:00; TOO RESPONSE TIME 11.0D On Hold Comments: Additional Comments: WITHDRAW THIS VISIT - REPLACED WITH VISIT 4 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 SN2024GGI STIS/CCD ACQ F28X50LP MIRROR 1 2 S (2 S) Comments: STIS DD 23ixf visit 2 spectrum renormalized to V=12.35 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2024GGI STIS/CCD ACCUM 52X0.2E1 G230LB 2375 CR-SPLIT=4 1 1800 S (1800 S) Comments: STIS DD 23ixf visit 2 spectrum renormalized to V=12.35 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2024GGI STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=2 1 36 S (36 S) Comments: STIS DD 23ixf visit 2 spectrum renormalized to V=12.35 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2024GGI 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2024GGI 2 STIS/CCD ACCUM 52X0.2E1 G230LB 2375 none none none 1 1 N/A SN2024GGI 2 STIS/CCD ACCUM 52X0.2E1 G230LB 2375 none none none 2 1 N/A SN2024GGI 2 STIS/CCD ACCUM 52X0.2E1 G230LB 2375 none none none 3 1 N/A SN2024GGI 2 STIS/CCD ACCUM 52X0.2E1 G230LB 2375 none none none 4 1 N/A SN2024GGI 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 1 1 N/A SN2024GGI 3 STIS/CCD ACCUM 52X0.2E1 G430L 4300 none none none 2 1 N/A 17614( 5) - 14-Aug-2024 15:41:21 - [ 5] Visit: 02 (Day 50) Visit Requirements: BETWEEN 20-MAY-2024:00:00:00 AND 06-JUN-2024:00:00:00 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 SN2024GGI STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) Comments: STIS DD 23ixf visit 5 spectrum renormalized to V=12.9 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2243 S) Comments: STIS DD 23ixf visit 5 spectrum renormalized to V=12.9 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2455 S -MAMA see below (2739 S) Comments: STIS DD 23ixf visit 5 spectrum renormalized to V=12.9 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2024GGI 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2024GGI 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2243.0 S -MAMA SN2024GGI 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2739.0 S -MAMA 17614( 5) - 14-Aug-2024 15:41:21 - [ 6] Visit: 03 (Day 100) Visit Requirements: BETWEEN 09-JUL-2024:00:00:00 AND 29-JUL-2024:00:00:00 On Hold Comments: Additional Comments: WITHDRAW THIS VISIT - REPLACED WITH VISIT 4 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 SN2024GGI STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) Comments: FLOYDS 23ixf 8/26 (day 100) spectrum renormalized to V=15.6 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2200 S -MAMA see below (2243 S) Comments: STIS DD 23ixf visit 2 spectrum renormalized to V=15.6 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2455 S -MAMA see below (2739 S) Comments: STIS DD 23ixf visit 2 spectrum renormalized to V=15.6 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2455 S -MAMA see below (2739 S) Comments: STIS DD 23ixf visit 2 spectrum renormalized to V=15.6 w/ E(B-V)=0.3 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2024GGI 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2024GGI 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2243.0 S -MAMA SN2024GGI 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2739.0 S -MAMA SN2024GGI 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 3 2739.0 S -MAMA 17614( 5) - 14-Aug-2024 15:41:21 - [ 7] Visit: 04 (Day 200) Visit Requirements: BETWEEN 21-NOV-2024:00:00:00 AND 06-DEC-2024:00:00:00 On Hold Comments: Additional Comments: Estimated brightness V=17.5 is from SN 2018zd V band light curve (with 24ggi distance and extinction) at 225d based on match to the light curve. SN 2018zd had a large fall from plateau so we consider this a conservative estimate Inclusion of FUV approved by TTRB - but this will need a new BOP check 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 SN2024GGI STIS/CCD ACQ F28X50LP MIRROR 1 3 S (3 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2170 S -MAMA (2170 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SN2024GGI STIS/NUV ACCUM 52X0.2 G230L 2376 1 2625 S -MAMA (2625 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SN2024GGI STIS/FUV ACCUM 52X0.2 G140L 1425 1 2625 S -MAMA (2625 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SN2024GGI STIS/FUV ACCUM 52X0.2 G140L 1425 1 2625 S -MAMA (2625 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 | ------------------------------------------------------------------------------------------------------------------------------------ SN2024GGI 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SN2024GGI 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA SN2024GGI 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA SN2024GGI 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 N/A -MAMA SN2024GGI 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 N/A -MAMA 17614( 5) - 14-Aug-2024 15:41:21 - [ 8] Summary Form for Proposal 17614 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2, 52X0.2E1, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, CR-SPLIT=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 09-JUL-2024:00:00:00 AND 29-JUL-2024:00:00:00, BETWEEN 12-MAY-2024:00:00:00 AND 31-MAY-2024:00:00:00, BETWEEN 20-MAY-2024:00:00:00 AND 06-JUN-2024:00:00:00, BETWEEN 21-NOV-2024:00:00:00 AND 06-DEC-2024:00:00:00, TOO RESPONSE TIME 11.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, G230LB, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names SN2024GGI ------------------------------------------------------------------------------------------------------------------------------------