17775( 3) - 14-Mar-2025 23:07:39 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17775 Version: 3 Check-in Time: 14-Mar-2025 23:07:39 STScI Edit Number: 0 Title Double Trouble: Understanding the Origins of Double Peaked Tidal Disruption Events ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Charlotte Rebecca Angus Queen's University Belfast Y CoI: Dr. Matt Nicholl Queen's University Belfast N CoI: Dr. Sandra Raimundo University of Southampton N CoI: Dr. Katie Auchettl University of Melbourne N CoI: Aprajita Hajela Northwestern University N CoI: Paige Ramsden University of Birmingham N CoI: Xinyue Sheng University of Birmingham N ------------------------------------------------------------------------------------ Abstract Tidal disruption events (TDEs), the flares produced when a star is disrupted by supermassive black hole, present a unique opportunity to study the accretion processes around black holes, and to probe their fundamental properties. For partial TDEs (pTDEs), events where only a small fraction of the star is disrupted, some cases can exhibit multiple peaks within the light curve, where the star undergoes repeat disruptions as its orbit cyclically brings it back within the vicinity of the black hole. Such events are the holy grail of TDE studies, as their intrinsic set-up provides strong constraints upon the disrupting system. However, they are expected to be extremely rare: approximately 0.1% of the TDE population. Long term monitoring from modern transient surveys have now revealed 5 TDE events whose light curves exhibit two distinct peaks. This unprecedented sample of repeating pTDE candidates is troubling, as it implies repeating pTDEs are far more frequent than theory suggests. Here we propose joint HST WFC3 and Gemini GMOS-IFU observations of the host galaxies of repeating pTDEs, to explore their structure, kinematics and gravitational potential on scales of ~100pc. With these data we will determine if the properties of the host galaxy environment are enhancing the likelihood of repeating pTDEs, and thus elucidate why such a large sample of double peaked TDEs exists. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will obtain UVIS imaging in the F438W, F625W and F814W bands of the host galaxies of 4 repeating partial tidal disruption events. We aim to observe each galaxy to a depth of 26 mag arcsec^-2 in each filter. For each target we will split our observations over 3 visits of 1 orbit, as follows: - Visit 1: 4x ~550~s exposure in F438W in a 4-point dither pattern - Visit 2: 2x ~650s exposure in F438W, 2x 400s exposures in F625W. All observations in a 2-point dither pattern - Visit 3: 2x ~650s exposure in F438W, 2x 350s exposures in F814W. All 17775( 3) - 14-Mar-2025 23:07:39 - [ 2] observations in a 2-point dither pattern A POS TARG offset of +/-0.1 arcsec has been applied to the F438W imaging in visits 2 and 3 to assure that if visits are happen to be executed at the same value of roll angle, the stellar pattern is not aligned on the same pixels. ------------------------------------------------------------------------------------ 17775( 3) - 14-Mar-2025 23:07:39 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 AT-2022DBL GALAXY, ELLIPTICAL RA=12H20M45.0100S, J2000 Z = V = 15.50 DEC=+49D33'4.68" 0.0284 Reference Frame: Other: SIMBAD Extended: YES Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2019AALC GALAXY, SPIRAL RA=15H24M16.6600S, J2000 V = 14.45 DEC=+04D51'19.05" Reference Frame: Other: TNS ------------------------------------------------------------------------------------------------------------------------------------ 3 AT-2020VDQ GALAXY, DWARF RA=10H08M53.4400S, J2000 V = 18.31 ELLIPTICAL DEC=+42D43'0.23" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 4 AT-2022EXR GALAXY, ELLIPTICAL RA=17H29M50.5100S, J2000 V = 17.7 DEC=+25D50'31.92" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17775( 3) - 14-Mar-2025 23:07:39 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17775( 3) - 14-Mar-2025 23:07:39 - [ 5] Visit: 01 (AT2022dbl Visit 1) Visit Requirements: 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 AT-2022DBL WFC3/UVI ACCUM UVIS2 F438W FLASH=12 1 567 S PATTERN 2 1 S see below (2269 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 568.0 S S AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 567 S S AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 3 none none none 1 567 S S AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 4 none none none 1 567 S S 17775( 3) - 14-Mar-2025 23:07:39 - [ 6] Visit: 02 (AT2022dbl Visit 2) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first visit if orientation angle the same 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 AT-2022DBL WFC3/UVI ACCUM UVIS2 F438W FLASH=12 1 600 S POS TARG -0.1, -0.1; S see below PATTERN 1 1 (1446 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT-2022DBL WFC3/UVI ACCUM UVIS2 F625W FLASH=12 1 430 S PATTERN 1 2 S see below (800 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 723.0 S S AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 723.0 S S AT-2022DBL 2 WFC3/UVI ACCUM UVIS2 F625W 1 none none none 1 400 S S AT-2022DBL 2 WFC3/UVI ACCUM UVIS2 F625W 2 none none none 1 400 S S 17775( 3) - 14-Mar-2025 23:07:39 - [ 7] Visit: 03 (AT2022dbl Visit 3) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first/second visit if orientation angle the same 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 AT-2022DBL WFC3/UVI ACCUM UVIS2 F438W FLASH=12 1 600 S POS TARG +0.1, +0.1; S see below PATTERN 1 1 (1549 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT-2022DBL WFC3/UVI ACCUM UVIS2 F814W FLASH=12 1 480 S PATTERN 1 2 S see below (700 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 774.0 S S AT-2022DBL 1 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 775.0 S S AT-2022DBL 2 WFC3/UVI ACCUM UVIS2 F814W 1 none none none 1 350.0 S S AT-2022DBL 2 WFC3/UVI ACCUM UVIS2 F814W 2 none none none 1 350.0 S S 17775( 3) - 14-Mar-2025 23:07:39 - [ 8] Visit: 04 (AT2019aalc Visit 1) Visit Requirements: 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 AT2019AALC WFC3/UVI ACCUM UVIS2 F438W FLASH=12 1 1300 S PATTERN 2 1 S see below (2212 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 553.0 S S AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 553.0 S S AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 3 none none none 1 553 S S AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 4 none none none 1 553 S S 17775( 3) - 14-Mar-2025 23:07:39 - [ 9] Visit: 05 (AT2019aalc Visit 2) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first visit if orientation angle the same 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 AT2019AALC WFC3/UVI ACCUM UVIS2 F438W FLASH=12 1 600 S POS TARG -0.1, -0.1; S see below PATTERN 1 1 (1389 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2019AALC WFC3/UVI ACCUM UVIS2 F625W FLASH=12 1 430 S PATTERN 1 2 S see below (800 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 695.0 S S AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 694.0 S S AT2019AALC 2 WFC3/UVI ACCUM UVIS2 F625W 1 none none none 1 400 S S AT2019AALC 2 WFC3/UVI ACCUM UVIS2 F625W 2 none none none 1 400 S S 17775( 3) - 14-Mar-2025 23:07:39 - [ 10] Visit: 06 (AT2019aalc Visit 3) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first/second visit if orientation angle the same 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 AT2019AALC WFC3/UVI ACCUM UVIS2 F438W FLASH=12 1 600 S POS TARG +0.1, +0.1; S see below PATTERN 1 1 (1492 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2019AALC WFC3/UVI ACCUM UVIS2 F814W FLASH=12 1 480 S PATTERN 1 2 S see below (700 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 746.0 S S AT2019AALC 1 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 746.0 S S AT2019AALC 2 WFC3/UVI ACCUM UVIS2 F814W 1 none none none 1 350 S S AT2019AALC 2 WFC3/UVI ACCUM UVIS2 F814W 2 none none none 1 350 S S 17775( 3) - 14-Mar-2025 23:07:39 - [ 11] Visit: 07 (AT2020vdq Visit 1) Visit Requirements: 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 AT-2020VDQ WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 1300 S PATTERN 2 1 S 1C-CTE see below (2256 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 564.0 S S K1C-CTE AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 564.0 S S K1C-CTE AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 564.0 S S K1C-CTE AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none none 1 564.0 S S K1C-CTE 17775( 3) - 14-Mar-2025 23:07:39 - [ 12] Visit: 08 (AT2020vdq Visit 2) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first visit if orientation angle the same 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 AT-2020VDQ WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 600 S POS TARG -0.1, -0.1; S 1C-CTE see below PATTERN 1 1 (1433 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT-2020VDQ WFC3/UVI ACCUM UVIS2-C1K F625W FLASH=12 1 430 S PATTERN 1 2 S 1C-CTE see below (800 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 716.0 S S K1C-CTE AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 717.0 S S K1C-CTE AT-2020VDQ 2 WFC3/UVI ACCUM UVIS2-C1 F625W 1 none none none 1 400 S S K1C-CTE AT-2020VDQ 2 WFC3/UVI ACCUM UVIS2-C1 F625W 2 none none none 1 400 S S K1C-CTE 17775( 3) - 14-Mar-2025 23:07:39 - [ 13] Visit: 09 (AT2020vdq Visit 3) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first/second visit if orientation angle the same 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 AT-2020VDQ WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 600 S POS TARG +0.1, +0.1; S 1C-CTE see below PATTERN 1 1 (1536 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT-2020VDQ WFC3/UVI ACCUM UVIS2-C1K F814W FLASH=10 1 480 S PATTERN 1 2 S 1C-CTE see below (700 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 768.0 S S K1C-CTE AT-2020VDQ 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 768.0 S S K1C-CTE AT-2020VDQ 2 WFC3/UVI ACCUM UVIS2-C1 F814W 1 none none none 1 350 S S K1C-CTE AT-2020VDQ 2 WFC3/UVI ACCUM UVIS2-C1 F814W 2 none none none 1 350 S S K1C-CTE 17775( 3) - 14-Mar-2025 23:07:39 - [ 14] Visit: 10 (AT2022exr Visit 1) Visit Requirements: 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 AT-2022EXR WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 1300 S PATTERN 2 1 S 1C-CTE see below (2239 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 560.0 S S K1C-CTE AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 560.0 S S K1C-CTE AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 3 none none none 1 560.0 S S K1C-CTE AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 4 none none none 1 559.0 S S K1C-CTE 17775( 3) - 14-Mar-2025 23:07:39 - [ 15] Visit: 11 (AT2022exr Visit 2) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first visit if orientation angle the same 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 AT-2022EXR WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 600 S POS TARG -0.1, -0.1; S 1C-CTE see below PATTERN 1 1 (1416 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT-2022EXR WFC3/UVI ACCUM UVIS2-C1K F625W FLASH=10 1 430 S PATTERN 1 2 S 1C-CTE see below (800 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 708.0 S S K1C-CTE AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 708.0 S S K1C-CTE AT-2022EXR 2 WFC3/UVI ACCUM UVIS2-C1 F625W 1 none none none 1 400.0 S S K1C-CTE AT-2022EXR 2 WFC3/UVI ACCUM UVIS2-C1 F625W 2 none none none 1 400.0 S S K1C-CTE 17775( 3) - 14-Mar-2025 23:07:39 - [ 16] Visit: 12 (AT2020exr Visit 3) Visit Requirements: On Hold Comments: Additional Comments: POS TARG offset to avoid same F438W position as first/second visit if orientation angle the same 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 AT-2022EXR WFC3/UVI ACCUM UVIS2-C1K F438W FLASH=12 1 600 S POS TARG +0.1, +0.1; S 1C-CTE see below PATTERN 1 1 (1519 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT-2022EXR WFC3/UVI ACCUM UVIS2-C1K F814W FLASH=10 1 480 S PATTERN 1 2 S 1C-CTE see below (700 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 1 none none none 1 760.0 S S K1C-CTE AT-2022EXR 1 WFC3/UVI ACCUM UVIS2-C1 F438W 2 none none none 1 759.0 S S K1C-CTE AT-2022EXR 2 WFC3/UVI ACCUM UVIS2-C1 F814W 1 none none none 1 350.0 S S K1C-CTE AT-2022EXR 2 WFC3/UVI ACCUM UVIS2-C1 F814W 2 none none none 1 350.0 S S K1C-CTE 17775( 3) - 14-Mar-2025 23:07:39 - [ 17] Summary Form for Proposal 17775 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures UVIS2, UVIS2-C1K1C-CTE ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, FLASH=12 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PATTERN 1 1, PATTERN 1 2, PATTERN 2 1, POS TARG +0.1, +0.1, POS TARG -0.1, -0.1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F438W, F625W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names AT-2020VDQ, AT-2022DBL, AT-2022EXR, AT2019AALC ------------------------------------------------------------------------------------------------------------------------------------