Programs requesting Future Cycles may not contain a Disruptive Target of Opportunity.
0
Assigned ID: 7311
----- Attempting Submission 1 (Thu Apr 16 07:25:03 GMT 2026) -----
HST Phase I Proposal 7311 successfully submitted.
Receipt: # 7311-1
----- Attempting Submission 2 (Thu Apr 16 22:49:34 GMT 2026) -----
The disruptive ToO is for Cycle 34. There are no future-Cycle disruptive ToOs. There is no error. This has been verified by the help desk.
This pattern is not used in this proposal.
This pattern is not used in this proposal.
This pattern is not used in this proposal.
Close to correct. Still need to optimize.
-1852904291
----- Attempting Submission 1 (Mon Aug 17 22:53:19 GMT 2026) -----
HST Phase II Proposal 18412 successfully submitted.
Receipt: # 18412-1
----- Attempting Submission 2 (Tue Aug 18 19:21:47 GMT 2026) -----
----- Attempting Submission 3 (Thu Aug 20 05:13:21 GMT 2026) -----
HST Phase II Proposal 18412 successfully submitted.
Receipt: # 18412-3
----- Attempting Submission 4 (Thu Aug 20 18:48:36 GMT 2026) -----
HST Phase II Proposal 18412 successfully submitted.
Receipt: # 18412-4
----- Attempting Submission 5 (Thu Aug 20 20:07:43 GMT 2026) -----
----- Attempting Submission 6 (Fri Aug 21 03:44:21 GMT 2026) -----
HST Phase II Proposal 18412 successfully submitted.
Receipt: # 18412-6
----- Attempting Submission 7 (Fri Aug 21 17:00:58 GMT 2026) -----
This is an intermediate submission that requires feedback.
Supernova of the Year: A Complete Picture of a Single Extraordinary Type Ia Supernova
Type Ia supernovae (SN Ia) are a fundamental cosmological probe, are critical for enriching the Universe with metals, and provide feedback for star formation. Yet, we do not know which star systems produce them or how they explode. The most progress in these areas has been made when obtaining exceptional datasets for individual SNe. Here we propose an ambitious and comprehensive program to (1) determine the progenitor metallicity and explosion mechanism through UV spectroscopy, (2) separate the SN's intrinsic color from the dust reddening law with UV through NIR photometry, (3) measure the central density of the progenitor star by examining the late-time fading, (4) constrain the progenitor age from observations of its environment, (5) search for any potential companion star using NOIRLab observations in the first few days after explosion, (6) measure the ejecta composition and kinematics with late-time NOIRLab/JWST optical/NIR/MIR spectroscopy, (7) determine circumstellar properties with Chandra X-ray and VLA radio obserations, and (8) measure a precise distance from observations of Cepheid variables. No SN Ia has had all of these measurements, and only the two closest SN Ia since Hubble's launch have six of the eight.
These data will unveil new, detailed understanding of SN Ia physics and be a complete dataset against which theories will betested. This program will be a legacy for SN Ia science for decades.
To be added
Our large team has led several proposals in all areas here. PI Foley and CoIs Filippenko, Kirshner, and Siebert have led similar programs on UV spectra and photometry. CoIs Jha, and Kwok have led similar JWST programs. CoI Margutti has led Chandra and VLA programs. Several CoIs have led NOIRLab proposals.
PI Foley and CoIs Coulter, Dimitriadis, Filippenko, Fox, Jha, Kirshner, Kwok, Margutti, Narayan, Pan, Patra, Rest, and Siebert are accomplished transient observers.
CoIs Kasen, Kromer, Roepke, Sim, and Wheeler are prolific SN theorists.
CoI Davis is a UCSC graduate students whose thesis is on Type Ia supernovae.
Stellar Physics and Stellar Types
Stellar Physics and Stellar Types
6
false
true
false
false
false
false
false
true
PRIMARY
50
3.4
10
8
true
SUPPORTED
EXT-STAR
SUPERNOVA TYPE IA
NO
J2000
EXT-STAR
SUPERNOVA TYPE IA
ToO
STIS/NUV-MAMA
Spectroscopic
No
No
G230L
2376
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/NUV-MAMA
Spectroscopic
No
No
G230L
2376
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
STIS/NUV-MAMA
Spectroscopic
No
No
G230L
2376
STIS/CCD
Spectroscopic
No
No
G430L
4300
STIS/CCD
Spectroscopic
No
No
G750L
7751
WFC3/UVIS
Imaging
No
No
F350LP
WFC3/UVIS
Imaging
No
No
F555W
WFC3/UVIS
Imaging
No
No
F814W
WFC3/IR
Imaging
No
No
F160W
WFC3/IR
Imaging
No
No
F105W
WFC3/IR
Imaging
No
No
F125W
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Imaging
No
No
F160W
WFC3/UVIS
Imaging
No
No
F218W
WFC3/UVIS
Imaging
No
No
F225W
WFC3/UVIS
Imaging
No
No
F275W
WFC3/UVIS
Imaging
No
No
F336W
WFC3/UVIS
Imaging
No
No
F300X
ACS/WFC
Imaging
No
No
F850LP
WFC3/UVIS
Imaging
No
No
F275W
WFC3/UVIS
Imaging
No
No
F300X
WFC3/UVIS
Imaging
No
No
F336W
WFC3/UVIS
Imaging
No
No
F555W
WFC3/IR
Imaging
No
No
F110W
WFC3/IR
Imaging
No
No
F125W
WFC3/IR
Imaging
No
No
F140W
WFC3/IR
Imaging
No
No
F160W
ACS/WFC
Imaging
No
No
F850LP
POS-TARG
DITHER
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LINE
false
false
3
46.84
WFC3-UVIS-DITHER-LINE-3PT
1
false
POS-TARG
DITHER
0.636
LINE
false
false
2
41.788
WFC3-IR-DITHER-LINE
2
false
POS-TARG
DITHER
0.145
LINE
false
false
2
46.84
WFC3-UVIS-DITHER-LINE
3
false
POS-TARG
DITHER
0.636
IR Pattern
LINE
false
false
2
41.788
LINE
4
false
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true
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Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
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Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10)
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:pcs-visibility 2867
:pcs-gap 0
)
true
1
0
).1 for 14th mag star yields a s/n ~50
Time to saturation is 15 seconds.
Timing link suitability includes constraints ([17 After 07 by at most 0.2 days])
Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "17"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:50:54.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1105536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "17"
:obset-id "17"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "17"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2445
:al-overhead-at-end 55
:internal-dur-at-end 970
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
1
0
ToO
Timing link suitability includes constraints ([08 After 01 by 17.0 to 19.0 days] [18 After 08 by at most 0.2 days])
Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "08"
:proposal-version -1
:trans-version "20260618"
:date "20-Aug-2026 20:21:13.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "30"
:si-bright-earth-limb-angle 20.0
:data-volume 356512
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "08"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2487
:al-overhead-at-end 85
:internal-dur-at-end 1017
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2867
:pcs-gap 0
)
true
1
0
).1 for 14th mag star yields a s/n ~50
Time to saturation is 15 seconds.
Timing link suitability includes constraints ([18 After 08 by at most 0.2 days])
Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "18"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:50:56.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1105536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "18"
:obset-id "18"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "18"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2445
:al-overhead-at-end 55
:internal-dur-at-end 970
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
1
0
ToO
Timing link suitability includes constraints ([09 After 01 by 20.0 to 22.0 days] [19 After 09 by at most 0.2 days])
Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "09"
:proposal-version -1
:trans-version "20260618"
:date "20-Aug-2026 20:26:00.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 812128
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "09"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2487
:al-overhead-at-end 85
:internal-dur-at-end 1470
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2867
:pcs-gap 0
)
true
1
0
).1 for 14th mag star yields a s/n ~50
Time to saturation is 15 seconds.
Timing link suitability includes constraints ([19 After 09 by at most 0.2 days])
Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "19"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:50:58.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1105536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "19"
:obset-id "19"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "19"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2445
:al-overhead-at-end 55
:internal-dur-at-end 970
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
1
0
ToO
Timing link suitability includes constraints ([10 After 01 by 26.0 to 32.0 days] [20 After 10 by at most 0.2 days])
Hst Same orient constraint links visits (01 02 03 04 05 06 07 08 09 10)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "10"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:54:58.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1598928
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "10"
:orbit-number 1
:pcs-time 380
:si-vis-utilization 2482
:al-overhead-at-end 123
:internal-dur-at-end 31
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2867
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18412
:visit-id "10"
:orbit-number 2
:pcs-time 380
:si-vis-utilization 2484
:al-overhead-at-end 85
:internal-dur-at-end 1332
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2867
:pcs-gap 0
)
true
2
0
).1 for 14th mag star yields a s/n ~50
Time to saturation is 15 seconds.
).1 for 14th mag star yields a s/n ~50
Time to saturation is 15 seconds.
Timing link suitability includes constraints ([20 After 10 by at most 0.2 days])
Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "20"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:51:05.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 1
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 1105536
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "20"
:obset-id "20"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "20"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2445
:al-overhead-at-end 55
:internal-dur-at-end 970
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
1
0
ToO
Timing link suitability includes constraints ([21 After 01 by 44.0 to 52.0 days])
Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "21"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:58:00.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2323904
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "21"
:obset-id "21"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "21"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2292
:al-overhead-at-end 55
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18412
:visit-id "21"
:orbit-number 2
:pcs-time 301
:si-vis-utilization 2483
:al-overhead-at-end 129
:internal-dur-at-end 357
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
2
0
ToO
Timing link suitability includes constraints ([22 After 01 by 59.0 to 67.0 days])
Hst Same orient constraint links visits (11 12 13 14 15 16 17 18 19 20 21 22)
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18412
:visit-id "21"
:proposal-version -1
:trans-version "20260618"
:date "21-Aug-2026 09:58:00.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2323904
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18412
:visit-id "21"
:obset-id "21"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18412
:visit-id "21"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2292
:al-overhead-at-end 55
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18412
:visit-id "21"
:orbit-number 2
:pcs-time 301
:si-vis-utilization 2483
:al-overhead-at-end 129
:internal-dur-at-end 357
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2979
:pcs-gap 0
)
true
2
0
ToO