0
Assigned ID: 7715
----- Attempting Submission 1 (Thu Apr 16 22:15:11 GMT 2026) -----
HST Phase I Proposal 7715 successfully submitted.
Receipt: # 7715-1
----- Attempting Submission 2 (Thu Apr 16 22:43:26 GMT 2026) -----
0
----- Attempting Submission 1 (Fri Aug 14 20:57:21 GMT 2026) -----
Probing SMBH Locations, Properties, and Accretion Physics with Late-time observations of TDEs
Supermassive black holes (SMBHs) are fundamental components of galaxies, closely linked to their evolution through established scaling relations and feedback processes. Despite their significance, we know very little about their properties because most SMBHs in the nearby universe are inactive and difficult to detect. Although they are widely assumed to reside at galaxy centers, their alignment with host galaxies has not been tested at parsec scales. Processes such as mergers and gravitational recoil can displace SMBHs for Gyr, affecting gas accretion and feedback. Measuring SMBH offsets therefore opens a direct probe of galaxy dynamical evolution. Tidal disruption events (TDEs), in which stars are ripped apart and accreted by SMBHs, temporarily illuminate these otherwise dormant systems and provide a unique probe of SMBH properties. At late times, TDEs exhibit persistent UV emission that traces the SMBH position, enabling precise localization. With high-resolution HST imaging, we can measure the offset of the TDE/SMBH (traced by UV) from the center of the stellar light (traced by optical). We propose HST UV and optical imaging of 28 TDEs at ~1000-2000 days post-peak, increasing the existing sample with such data by a factor of ~2.5. This statistically significant sample will enable the first robust test of SMBH-host alignment at parsec scales, providing new constraints on galaxy dynamical evolution and the origin of TDE host preferences. In addition, this program will provide unprecedented constraints on the evolution of late-time UV emission in TDEs, probing the physics of accretion discs and enabling independent SMBH mass measurements.
We plan to observe 28 targets using a total of 56 HST orbits with WFC3/UVIS in two filters, F225W and F625W. For each target, one orbit will be allocated to each filter. The two orbits will be scheduled consecutively within the same visit to ensure a consistent telescope orientation, thereby maximizing the number of common sources available for relative astrometric alignment between the two filters. We will use a four-point box dither pattern for all observations to improve spatial sampling and image resolution.
The team combines extensive expertise in HST observations and tidal disruption event (TDE) science, ensuring strong technical execution and scientific return for the proposed program.
Xinze Guo is a graduate student advised by Prof. Edo Berger and Dr. Peter Blanchard at Harvard University. She has direct experience working with archival HST data from WFC3-UVIS and has developed and applied the analysis methodology proposed here to existing datasets. Dr. Peter Blanchard has extensive experience analyzing HST data, including the instrument proposed for in this program, obtained through current/previous HST programs. Prof. Edo Berger is a leading expert in time-domain astrophysics, including TDEs, and gamma-ray bursts and has led several previous HST programs. Prof. Matt Nicholl, an expert in transients, brings expertise in TDEs and their host galaxies and will contribute to the interpretation of the host environment. Dr. Harsh Kumar and Dr. Yuyang Chen provide additional expertise in TDE science and will support the analysis and physical interpretation of the data.
Supermassive Black Holes and Active Galaxies
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The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "11"
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:trans-version "20260618"
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:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2310000
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)
(Tic-Obset
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(Tic-Orbit
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)
(Tic-Orbit
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true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "12"
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:trans-version "20260618"
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:data-volume 2310000
:tdrss-contact-duration 0
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)
(Tic-Obset
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(Tic-Orbit
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true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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:trans-version "20260618"
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true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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(Tic-Obset
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(Tic-Orbit
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)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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(Tic-Obset
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(Tic-Orbit
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true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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)
(Tic-Orbit
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:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
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:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "19"
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:trans-version "20260618"
:date "12-Aug-2026 21:02:34.0"
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:data-volume 2310000
:tdrss-contact-duration 0
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)
(Tic-Obset
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(Tic-Orbit
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)
(Tic-Orbit
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:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
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:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "20"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:05:07.0"
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:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
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:orbit-number 1
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)
(Tic-Orbit
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:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2976
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "21"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:05:47.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
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:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
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:al-overhead-at-end 125
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)
(Tic-Orbit
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:si-vis-utilization 2741
:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3044
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "22"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:07:09.0"
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:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
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)
(Tic-Orbit
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:si-vis-utilization 2685
:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2987
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "23"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:08:19.0"
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:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
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)
(Tic-Orbit
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:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3225
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "24"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:10:37.0"
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:number-of-orbits 2
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:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
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)
(Tic-Orbit
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:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "25"
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:date "12-Aug-2026 21:11:12.0"
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:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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)
(Tic-Orbit
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:pcs-visibility 3001
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)
(Tic-Orbit
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:si-vis-utilization 2697
:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3001
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
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:number-of-orbits 2
:saa-model "29"
:si-bright-earth-limb-angle 20.0
:data-volume 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
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:obset-id "26"
:pcs-mode "FGS"
)
(Tic-Orbit
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:orbit-number 1
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:si-vis-utilization 2679
:al-overhead-at-end 125
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:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18392
:visit-id "26"
:orbit-number 2
:pcs-time 301
:si-vis-utilization 2681
:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "27"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:19:36.0"
: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 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18392
:visit-id "27"
:obset-id "27"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18392
:visit-id "27"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2723
:al-overhead-at-end 125
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18392
:visit-id "27"
:orbit-number 2
:pcs-time 301
:si-vis-utilization 2725
:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3026
:pcs-gap 0
)
true
2
0
The scheduling data was generated by CASM 34.2.
CASM was run in Phase II mode.
(Tic-Visit
:proposal-id 18392
:visit-id "28"
:proposal-version -1
:trans-version "20260618"
:date "12-Aug-2026 21:20:04.0"
: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 2310000
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 18392
:visit-id "28"
:obset-id "28"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 18392
:visit-id "28"
:orbit-number 1
:pcs-time 301
:si-vis-utilization 2679
:al-overhead-at-end 125
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 18392
:visit-id "28"
:orbit-number 2
:pcs-time 301
:si-vis-utilization 2681
:al-overhead-at-end 119
:internal-dur-at-end 668
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 2983
:pcs-gap 0
)
true
2
0