18060( 4) - 29-Oct-2025 15:52:58 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 18060 Version: 4 Check-in Time: 29-Oct-2025 15:52:58 STScI Edit Number: 0 Title Opening the crucial ultraviolet window on carbon dredge-up in white dwarfs ------------------------------------------------------------------------------------ Type Cycle GO 33 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Antoine Bedard University of Warwick Y CoI: Dr. Simon Blouin University of Victoria N CoI: Prof. Boris T. Gaensicke University of Warwick N CoI: Prof. Pier-Emmanuel Tremblay University of Warwick N ------------------------------------------------------------------------------------ Abstract About 30% of white dwarfs have helium-rich envelopes where deep convection occurs, leading to an important but poorly understood phenomenon: the dredge-up of carbon from the core to the otherwise pristine helium surface. This process has far-reaching implications, as the atmospheric carbon content (1) impacts white dwarf age determinations used to probe stellar and Galactic evolution, (2) affects the interpretation of exoplanetary material accreted onto white dwarfs, and (3) provides a rare empirical benchmark for the complex physics of dense plasmas. Yet, observational characterization is severely limited by the insensitivity of the optical window, where the trace carbon often remains spectroscopically invisible and only has a mild effect on the SED. Our understanding of carbon dredge-up thus rests on theoretical models, which depend on uncertain input physics and, crucially, have recently been called into question by Gaia observations. Fortunately, the ultraviolet window, and in particular the far-UV capabilities of HST, offers a clear and unique solution to this problem, as it is expected to reveal many strong carbon features allowing precise abundance determinations. We propose STIS far-UV spectroscopy of 16 bright helium-rich white dwarfs to detect and measure the surface carbon content across a key range of effective temperatures. These observations will enable the first robust test of dredge-up models, in turn providing valuable new constraints for dense matter physics and astrophysical applications of white dwarfs. ------------------------------------------------------------------------------------ Observations Description ------------------------ The goal of this proposal is to obtain low-resolution far-ultraviolet spectroscopy of 16 white dwarfs with helium atmospheres and temperatures of 11000-15000 K to probe for carbon absorption features. We will carry out the target acquisition with the STIS CCD and the F28x50LP broad-band filter, followed by STIS FUV spectroscopy using the G140L grating and the 52x2 aperture to maximise the throughput. Each observation uses one HST orbit. Update 15-08-2025: The target of Visit 11 has been changed. The original target (WDJ160139.76-034540.01) has a bright nearby companion and would have required 18060( 4) - 29-Oct-2025 15:52:58 - [ 2] a specific slit orientation that was unschedulable. The new target (WDJ055231.03+164250.27) does not have this problem, has otherwise similar parameters, and is equally useful for the science goal. Update 29-10-2025: The aperture for the science exposure of Visit 08 has been changed. The target of this visit (WDJ133601.82+482846.25) has an active M-dwarf companion, so we will use the 31x0.05NDA aperture to meet the UV-bright flare safety requirements. A peakup exposure has been added before the science exposure to center the target on the small slit. To maximize the science exposure time, automatic wavecal has been disabled and a GO-wavecal exposure has been added after the science exposure. ------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 WDJ000331.63 STAR, DB RA=00H03M31.6265S, J2000 V = 14.65 -164358.41 DEC=-16D43'58.41" 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 0.01720970408816317 0.0011040000000000002 0.0262578 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ041652.65 STAR, DB RA=04H16M52.6475S, J2000 V = 15.28 -042723.91 DEC=-04D27'23.91" 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 2.8392513650294206E-4 -0.041621000000000005 0.0186001 ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ044427.35 STAR, DB RA=04H44M27.3535S, J2000 V = 15.71 -351745.09 DEC=-35D17'45.09" 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 -0.002199353178082082 -0.072503 0.0169224 ------------------------------------------------------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 4] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 WDJ070357.43 STAR, DB RA=07H03M57.4256S, J2000 V = 13.93 +253418.34 DEC=+25D34'18.33" 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 -0.004318629656732694 -0.055622 0.0390516 ------------------------------------------------------------------------------------------------------------------------------------ 5 WDJ074841.90 STAR, DB RA=07H48M41.8976S, J2000 V = 15.69 -032334.14 DEC=-03D23'34.14" 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 7.811024062911571E-4 -0.04309 0.0169037 ------------------------------------------------------------------------------------------------------------------------------------ 6 WDJ092345.74 STAR, DB RA=09H23M45.7412S, J2000 V = 14.97 -302148.46 DEC=-30D21'48.46" 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 -0.002975535784424953 0.002181 0.0212979 ------------------------------------------------------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 5] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 7 WDJ132550.44 STAR, DB RA=13H25M50.4417S, J2000 V = 14.81 -601508.04 DEC=-60D15'8.04" 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 -0.0063656664707590245 0.077309 0.0278243 ------------------------------------------------------------------------------------------------------------------------------------ 8 WDJ133601.82 STAR, DB RA=13H36M1.8225S, J2000 V = 14.10 +482846.25 DEC=+48D28'46.25" 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 -0.013471158668910185 -0.042905 0.027129 ------------------------------------------------------------------------------------------------------------------------------------ 9 WDJ141329.83 STAR, DB RA=14H13M29.8347S, J2000 V = 14.45 +213739.88 DEC=+21D37'39.88" 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 -0.0043731442464767355 0.104967 0.0241089 ------------------------------------------------------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 6] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 10 WDJ154937.89 STAR, DB RA=15H49M37.8929S, J2000 V = 14.43 -395455.21 DEC=-39D54'55.21" 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 -0.004990134007320578 -0.078888 0.0264573 ------------------------------------------------------------------------------------------------------------------------------------ 11 WDJ055231.03 STAR, DB RA=05H52M31.0336S, J2000 V = 15.10 +164250.27 DEC=+16D42'50.27" 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 8.998149951122964E-4 -0.057890000000000004 0.024968 ------------------------------------------------------------------------------------------------------------------------------------ 12 WDJ165114.11 STAR, DB RA=16H51M14.1099S, J2000 V = 14.86 -143535.30 DEC=-14D35'35.31" 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 0.0034312269931749675 -0.056525 0.0234867 ------------------------------------------------------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 7] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 13 WDJ191144.26 STAR, DB RA=19H11M44.2602S, J2000 V = 14.68 -272954.76 DEC=-27D29'54.76" 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 0.008629167941916179 -0.100185 0.028872 ------------------------------------------------------------------------------------------------------------------------------------ 14 WDJ204930.79 STAR, DB RA=20H49M30.7939S, J2000 V = 15.43 -300502.86 DEC=-30D05'2.86" 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 -3.6519534974273837E-4 -0.093237 0.0203609 ------------------------------------------------------------------------------------------------------------------------------------ 15 WDJ210951.16 STAR, DB RA=21H09M51.1591S, J2000 V = 15.61 +425705.12 DEC=+42D57'5.12" 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 0.017829624374832466 -0.017263999999999998 0.0176643 ------------------------------------------------------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 8] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 16 WDJ214954.57 STAR, DB RA=21H49M54.5666S, J2000 V = 14.65 +281659.59 DEC=+28D16'59.59" 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 0.01880062392168468 -0.07582699999999999 0.028778 ------------------------------------------------------------------------------------------------------------------------------------ 18060( 4) - 29-Oct-2025 15:52:58 - [ 9] Visit: 01 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 WDJ000331.6 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 3-164358.41 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ000331.6 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=953 1 2027 S 3-164358.41 -MAMA G (2027 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ000331.63-164358 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .41 WDJ000331.63-164358 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .41 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 10] Visit: 02 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 WDJ041652.6 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 5-042723.91 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ041652.6 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1077 1 2030 S 5-042723.91 -MAMA G (2030 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ041652.65-042723 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .91 WDJ041652.65-042723 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .91 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 11] Visit: 03 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 WDJ044427.3 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 5-351745.09 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ044427.3 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1061 1 2043 S 5-351745.09 -MAMA G (2043 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ044427.35-351745 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .09 WDJ044427.35-351745 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .09 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 12] Visit: 04 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 WDJ070357.4 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 3+253418.34 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ070357.4 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=978 1 2034 S 3+253418.34 -MAMA G (2034 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ070357.43+253418 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .34 WDJ070357.43+253418 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .34 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 13] Visit: 05 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 WDJ074841.9 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 0-032334.14 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ074841.9 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1166 1 2030 S 0-032334.14 -MAMA G (2030 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ074841.90-032334 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .14 WDJ074841.90-032334 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .14 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 14] Visit: 06 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 WDJ092345.7 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 4-302148.46 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ092345.7 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=962 1 2038 S 4-302148.46 -MAMA G (2038 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ092345.74-302148 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .46 WDJ092345.74-302148 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .46 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 15] Visit: 07 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 WDJ132550.4 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 4-601508.04 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ132550.4 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1158 1 2115 S 4-601508.04 -MAMA G (2115 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ132550.44-601508 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .04 WDJ132550.44-601508 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .04 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 16] Visit: 08 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 WDJ133601.8 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 2+482846.25 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ133601.8 STIS/CCD ACQ/PEA 31X0.05ND MIRROR 1 4 S (4 S) 2+482846.25 K A ------------------------------------------------------------------------------------------------------------------------------------ 3 WDJ133601.8 STIS/FUV TIME-TA 31X0.05ND G140L 1425 BUFFER-TIME=5272, WAVECAL=NO 1 1802 S 2+482846.25 -MAMA G A (1802 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 WAVE STIS/FUV ACCUM 52X0.05 G140L 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ133601.82+482846 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .25 WDJ133601.82+482846 2 STIS/CCD ACQ/PEA 31X0.05N MIRROR none none none none 1 N/A .25 K DA WDJ133601.82+482846 3 STIS/FUV TIME-TA 31X0.05N G140L 1425 none none none none 1 N/A .25 -MAMA G DA WAVE 4 STIS/FUV ACCUM 52X0.05 G140L 1425 none none none none 1 N/A -MAMA 18060( 4) - 29-Oct-2025 15:52:58 - [ 17] Visit: 09 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 WDJ141329.8 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 3+213739.88 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ141329.8 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=709 1 2030 S 3+213739.88 -MAMA G (2030 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ141329.83+213739 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .88 WDJ141329.83+213739 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .88 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 18] Visit: 10 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 WDJ154937.8 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 9-395455.21 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ154937.8 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=841 1 2043 S 9-395455.21 -MAMA G (2043 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ154937.89-395455 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .21 WDJ154937.89-395455 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .21 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 19] Visit: 11 Visit Requirements: On Hold Comments: Additional Comments: The target of this visit has been changed. The original target (WDJ160139.76-034540.01) has a bright nearby companion and would have required a specific slit orientation that was unschedulable. The new target (WDJ055231.03+164250.27) does not have this problem, has otherwise similar parameters, and is equally useful for the science goal. 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 WDJ055231.0 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 3+164250.27 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ055231.0 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1111 1 2027 S 3+164250.27 -MAMA G (2027 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ055231.03+164250 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .27 WDJ055231.03+164250 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .27 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 20] Visit: 12 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 WDJ165114.1 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 1-143535.30 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ165114.1 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=986 1 2025 S 1-143535.30 -MAMA G (2025 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ165114.11-143535 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .30 WDJ165114.11-143535 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .30 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 21] Visit: 13 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 WDJ191144.2 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 6-272954.76 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ191144.2 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1104 1 2034 S 6-272954.76 -MAMA G (2034 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ191144.26-272954 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .76 WDJ191144.26-272954 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .76 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 22] Visit: 14 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 WDJ204930.7 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 9-300502.86 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ204930.7 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1161 1 2038 S 9-300502.86 -MAMA G (2038 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ204930.79-300502 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .86 WDJ204930.79-300502 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .86 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 23] Visit: 15 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 WDJ210951.1 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 6+425705.12 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ210951.1 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1148 1 2052 S 6+425705.12 -MAMA G (2052 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ210951.16+425705 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .12 WDJ210951.16+425705 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .12 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 24] Visit: 16 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 WDJ214954.5 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) 7+281659.59 ------------------------------------------------------------------------------------------------------------------------------------ 2 WDJ214954.5 STIS/FUV TIME-TA 52X2 G140L 1425 BUFFER-TIME=1056 1 2034 S 7+281659.59 -MAMA G (2034 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 | ------------------------------------------------------------------------------------------------------------------------------------ WDJ214954.57+281659 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A .59 WDJ214954.57+281659 2 STIS/FUV TIME-TA 52X2 G140L 1425 none none none none 1 N/A .59 -MAMA G 18060( 4) - 29-Oct-2025 15:52:58 - [ 25] Summary Form for Proposal 18060 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 31X0.05NDA, 52X0.05, 52X2, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, ACQ/PEAK, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters BUFFER-TIME=1056, BUFFER-TIME=1061, BUFFER-TIME=1077, BUFFER-TIME=1104, BUFFER-TIME=1111, BUFFER-TIME=1148, BUFFER-TIME=1158, BUFFER-TIME=1161, BUFFER-TIME=1166, BUFFER-TIME=5272, BUFFER-TIME=709, BUFFER-TIME=841, BUFFER-TIME=953, BUFFER-TIME=962, BUFFER-TIME=978, BUFFER-TIME=986, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names WAVE, WDJ000331.63-164358.41, WDJ041652.65-042723.91, WDJ044427.35-351745.09, WDJ055231.03+164250.27, WDJ070357.43+253418.34, WDJ074841.90-032334.14, WDJ092345.74-302148.46, WDJ132550.44-601508.04, WDJ133601.82+482846.25, WDJ141329.83+213739.88, WDJ154937.89-395455.21, WDJ165114.11-143535.30, WDJ191144.26-272954.76, WDJ204930.79-300502.86, WDJ210951.16+425705.12, WDJ214954.57+281659.59 ------------------------------------------------------------------------------------------------------------------------------------