17701( 5) - 27-May-2025 20:40:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17701 Version: 5 Check-in Time: 27-May-2025 20:40:42 STScI Edit Number: 1 Title Confirming Onion-Shell Accretion in T Tauri Stars ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Thanawuth Thanathibodee Chulalongkorn University Y CoI: Dr. Catherine Espaillat Boston University N CoI: Dr. Nuria Calvet University of Michigan N CoI: Prof. Zhaohuan Zhu University of Nevada - Las Vegas N CoI: Caeley Pittman Boston University N ------------------------------------------------------------------------------------ Abstract Accretion from disks onto low-mass, pre-main sequence stars (T Tauri stars) is an important process in star and planet formation. Close-in, rocky planets form in an environment affected by magnetospheric accretion in T Tauri disks. Numerical simulations have been used to study this dynamic process, confirming key observable results. In recent years, advances in numerical methods and increases in computational power have enabled detailed studies of accretion by simulating the interaction between the star, its magnetosphere, and an MRI-active inner disk. New simulations suggest the existence of inner filaments, where mass proceeds horizontally and accretes onto the star in an onion-shell-like structure. Observational evidence of such a structure exists as a low-velocity redshifted absorption feature in the H-alpha profiles of T Tauri stars accreting at very low rates, but an independent verification is required. Here, we propose to confirm onion-shell accretion in five low accretors with joint HST/STIS and Gemini/GHOST observations. Modeling the accretion shock emission can help to distinguish between models with inner filaments and models where accretion occurs strictly through high-latitude flows. Our results will provide insight into young stars' immediate environment -- a region crucial for close-in planet formation. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will use 9 HST orbits to obtain NUV-optical spectra of 5 T Tauri stars with very low accretion rates (low accretors) to search for evidence of Onion-shell accretion using multi-column accretion shock models. For each star, we will obtain the NUV spectrum with STIS/NUV-MAMA+G230L and the optical spectra with STIS/CCD+G430L+G750L. We will use the 52x2 slit for all configurations. The NUV spectra are needed to measure the accretion luminosity, while the optical spectra will be used for scaling with photospheric templates. We aim for SNR greater than 3 redward of 2300 Angstrom for the NUV spectra and SNR~50 in the optical. To estimate the NUV exposure times, we scaled the spectrum of a low accretor RECX-11 by distance, and we used the Kurucz/Bruzual synthetic spectra for SNR estimation in the optical. To complement the HST observations, we also request coordinated observations with NOIRLab to use the GHOST instrument on Gemini-South within a few days of the HST observations. The GHOST spectra will provide additional accretion diagnostics for accretion flow modeling to confirm 17701( 5) - 27-May-2025 20:40:42 - [ 2] the Onion-shell geometry. ------------------------------------------------------------------------------------ 17701( 5) - 27-May-2025 20:40:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CVSO-1335 STAR, T TAURI STAR RA=05H32M10.1680S, J2000 V = 13.8 DEC=-00D37'12.51" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 8.927189564787301E-5 -9.090000048672664E-4 0.0027494999999999998 ------------------------------------------------------------------------------------------------------------------------------------ 2 CVSO-40 STAR, T TAURI STAR RA=05H26M41.6246S, J2000 V = 14.96 DEC=-00D40'52.44" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 6.13376688281374E-6 1.9E-5 0.0023935 ------------------------------------------------------------------------------------------------------------------------------------ 3 CVSO-1763 STAR, T TAURI STAR RA=05H37M26.0136S, J2000 V = 14.85 +/- 0.858 DEC=-05D34'1.33" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 1.1212886955122671E-4 -3.859999424093985E-4 0.0025203 ------------------------------------------------------------------------------------------------------------------------------------ 17701( 5) - 27-May-2025 20:40:42 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 SO-682 STAR, T TAURI STAR RA=05H38M42.2801S, J2000 V = 15.27 DEC=-02D37'14.82" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. The SIMBAD-resolvable name is [HHM2007] 682. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 7.154149555058083E-5 -3.490000608508126E-4 0.0024402 ------------------------------------------------------------------------------------------------------------------------------------ 5 2MASS-J16253 STAR, T TAURI STAR RA=16H25M38.4801S, J2000 V = 11.4 849-2613540 DEC=-26D13'54.29" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. SIMBAD listed proper motion for this target. When retrieving targets with PM from SIMBAD, APT requests the coordinates be calculated with an epoch of the year 2000. Do not modify this epoch. Always review coordinates using the Target Confirmation tool, which graphically displays the PM. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -7.283427318769284E-4 -0.021499999911611667 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17701( 5) - 27-May-2025 20:40:42 - [ 5] Visit: 01 (CVSO 1335) Visit Requirements: PCS MODE FINE 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 CVSO-1335 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 2 S (2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CVSO-1335 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1366 1 923 S (923 -MAMA G S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CVSO-1335 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2 1 130 S (130 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 CVSO-1335 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2 1 40 S (40 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X2 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ CVSO-1335 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A CVSO-1335 2 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 1 N/A -MAMA G CVSO-1335 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A CVSO-1335 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A CVSO-1335 4 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A CVSO-1335 4 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A CCDFLAT 5 STIS/CCD ACCUM 52X2 G750L 7751 none none 1 none 1 N/A CCDFLAT 5 STIS/CCD ACCUM 52X2 G750L 7751 none none 2 none 1 N/A 17701( 5) - 27-May-2025 20:40:42 - [ 6] Visit: 02 (CVSO 40) Visit Requirements: PCS MODE FINE 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 CVSO-40 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CVSO-40 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1162 1 2018 S -MAMA G (2018 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CVSO-40 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1162 1 2597 S -MAMA G (2597 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 CVSO-40 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1162 1 777 S (777 -MAMA G S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CVSO-40 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=4 1 700 S (700 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CVSO-40 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2 1 70 S (70 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 CCDFLAT STIS/CCD ACCUM 52X2 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ CVSO-40 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A CVSO-40 2 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 1 N/A -MAMA G CVSO-40 3 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 2 N/A -MAMA G CVSO-40 4 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 3 N/A -MAMA G CVSO-40 5 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 3 N/A CVSO-40 5 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 3 N/A CVSO-40 5 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 3 3 N/A CVSO-40 5 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 4 3 N/A CVSO-40 6 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 3 N/A CVSO-40 6 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 3 N/A CCDFLAT 7 STIS/CCD ACCUM 52X2 G750L 7751 none none 1 none 3 N/A CCDFLAT 7 STIS/CCD ACCUM 52X2 G750L 7751 none none 2 none 3 N/A 17701( 5) - 27-May-2025 20:40:42 - [ 7] Visit: 03 (CVSO 1763) Visit Requirements: PCS MODE FINE 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 CVSO-1763 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 CVSO-1763 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1156 1 2023 S -MAMA G (2023 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CVSO-1763 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1156 1 857 S (857 -MAMA G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 CVSO-1763 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=4 1 480 S (480 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 CVSO-1763 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2 1 120 S (120 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X2 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ CVSO-1763 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A CVSO-1763 2 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 1 N/A -MAMA G CVSO-1763 3 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 2 N/A -MAMA G CVSO-1763 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 2 N/A CVSO-1763 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 2 N/A CVSO-1763 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 3 2 N/A CVSO-1763 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 4 2 N/A CVSO-1763 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 2 N/A CVSO-1763 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X2 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X2 G750L 7751 none none 2 none 2 N/A 17701( 5) - 27-May-2025 20:40:42 - [ 8] Visit: 04 (SO 682) Visit Requirements: PCS MODE FINE 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 SO-682 STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 5 S (5 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SO-682 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1158 1 2018 S -MAMA G (2018 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SO-682 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1158 1 682 S (682 -MAMA G S) ------------------------------------------------------------------------------------------------------------------------------------ 4 SO-682 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=4 1 700 S (700 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 SO-682 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2 1 70 S (70 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 CCDFLAT STIS/CCD ACCUM 52X2 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ SO-682 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A SO-682 2 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 1 N/A -MAMA G SO-682 3 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 2 N/A -MAMA G SO-682 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 2 N/A SO-682 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 2 N/A SO-682 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 3 2 N/A SO-682 4 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 4 2 N/A SO-682 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 2 N/A SO-682 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X2 G750L 7751 none none 1 none 2 N/A CCDFLAT 6 STIS/CCD ACCUM 52X2 G750L 7751 none none 2 none 2 N/A 17701( 5) - 27-May-2025 20:40:42 - [ 9] Visit: 05 (2MASS-J16253849-2613540) Visit Requirements: PCS MODE FINE 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 2MASS-J1625 STIS/CCD ACQ F28X50OII MIRROR ACQTYPE=POINT 1 5 S (5 S) 3849-261354 I 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J1625 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1109 1 1027 S 3849-261354 -MAMA G (1027 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J1625 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2 1 30 S (30 3849-261354 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J1625 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2 1 5 S (5 S) 3849-261354 0 ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X2 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16253849-261 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A 3540 II 2MASS-J16253849-261 2 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 1 N/A 3540 -MAMA G 2MASS-J16253849-261 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A 3540 2MASS-J16253849-261 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A 3540 2MASS-J16253849-261 4 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A 3540 2MASS-J16253849-261 4 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A 3540 CCDFLAT 5 STIS/CCD ACCUM 52X2 G750L 7751 none none 1 none 1 N/A CCDFLAT 5 STIS/CCD ACCUM 52X2 G750L 7751 none none 2 none 1 N/A 17701( 5) - 27-May-2025 20:40:42 - [ 10] Visit: 06 (visit 05 failure repeat) Visit Requirements: PCS MODE FINE 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 2MASS-J1625 STIS/CCD ACQ F28X50OII MIRROR ACQTYPE=POINT 1 5 S (5 S) 3849-261354 I 0 ------------------------------------------------------------------------------------------------------------------------------------ 2 2MASS-J1625 STIS/NUV TIME-TA 52X2 G230L 2376 BUFFER-TIME=1109 1 1027 S 3849-261354 -MAMA G (1027 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 3 2MASS-J1625 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2 1 30 S (30 3849-261354 S) 0 ------------------------------------------------------------------------------------------------------------------------------------ 4 2MASS-J1625 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2 1 5 S (5 S) 3849-261354 0 ------------------------------------------------------------------------------------------------------------------------------------ 5 CCDFLAT STIS/CCD ACCUM 52X2 G750L 7751 2 DEF (0 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 | ------------------------------------------------------------------------------------------------------------------------------------ 2MASS-J16253849-261 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A 3540 II 2MASS-J16253849-261 2 STIS/NUV TIME-TA 52X2 G230L 2376 none none none none 1 N/A 3540 -MAMA G 2MASS-J16253849-261 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A 3540 2MASS-J16253849-261 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A 3540 2MASS-J16253849-261 4 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A 3540 2MASS-J16253849-261 4 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A 3540 CCDFLAT 5 STIS/CCD ACCUM 52X2 G750L 7751 none none 1 none 1 N/A CCDFLAT 5 STIS/CCD ACCUM 52X2 G750L 7751 none none 2 none 1 N/A 17701( 5) - 27-May-2025 20:40:42 - [ 11] Summary Form for Proposal 17701 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X2, 52X2E1, F28X50LP, F28X50OIII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, BUFFER-TIME=1109, BUFFER-TIME=1156, BUFFER-TIME=1158, BUFFER-TIME=1162, BUFFER-TIME=1366, CR-SPLIT=2, CR-SPLIT=4 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements PCS MODE FINE ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G230L, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names 2MASS-J16253849-2613540, CCDFLAT, CVSO-1335, CVSO-1763, CVSO-40, SO-682 ------------------------------------------------------------------------------------------------------------------------------------