17832( 9) - 02-Jul-2025 12:15:07 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17832 Version: 9 Check-in Time: 02-Jul-2025 12:15:07 STScI Edit Number: 3 Title Deciphering an Adolescent Warm Sub-Neptune to Unify Formation Models with Primordial Atmospheres ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Ms. Amy Joan Louca Universiteit Leiden Y CoI: Dr. Billy Edwards Space Research Organization Netherlands Y CoI: Dr. Yamila Miguel Universiteit Leiden N CoI: Dr. Nestor Espinoza Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Prior observations of mature gas giants have shown evidence of metal-enhanced atmospheres with respect to their host-star. This enrichment could happen during the birth of the planet or it could be caused by atmospheric evolution. While formation and evolution models are able to provide various physical explanations, observational evidence to support any specific hypothesis is still missing due to an inability to distinguish the root-cause of metal-enhancement when studying evolved worlds. Atmospheric characterization of very young planets (<100 Myr), which are yet to experience significant atmospheric evolution, allows us to break the formation/evolution degeneracy and uncover the cause of metal-enrichment. We propose to observe the young (45 Myr) planet DS Tuc Ab using simultaneous transmission spectroscopy with HST WFC3 and JWST NIRSpec to measure the atmospheric metallicity and the carbon-to-oxygen ratio. Forward models show that water, methane, and carbon dioxide are the fundamental tracers of these characteristics, which are best distinguished by having a broad wavelength coverage. This can only be achieved by using both facilities. These data will also allow us to constrain the planet's mass which, in combination with the proposed STIS observations of the host star, will allow us to generate models of the planet's evolution to predict its final fate. Therefore, these observations will give us strict constraints on formation and evolution pathways for this adolescent world. By also using observations of analogue mature planets, we will be able to construct a timeline of atmospheric evolution and find the source of metal-enrichment in exoplanetary atmospheres. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will perform a time-series observation using WFC3 G141 to measure the transmission spectrum of DS Tuc A b. As the name suggests, DS Tuc A has a companion star (DS Tuc B) with a projected separation of 6.16". Due to the restraints of RGM, and the brightness of DS Tuc A, the spectra from these stars will overlap before the first NDR. Therefore, in order to correct for contamination from this companion star, each orbit contains a single G141 stare mode spectrum to measure the relative flux of the two stars. We have placed orient constraints such that the spectra of DS Tuc A and DS Tuc B do not 17832( 9) - 02-Jul-2025 12:15:07 - [ 2] overlap in this stare mode image. The scan observations will be taken with the 512x512 subarray. We will use the SPARS25, NSAMP=3 sampling sequence and the spatial scan mode with bi-directional scans to maximize the duty cycle. We will use a scan rate of ~0.93"/s, which will give peak counts of ~30K e-/pix from DS Tuc A and ~20K e-/pix from DS Tuc B. Hence, the regions in which these spectra overlap shall be <50K e-/pix. To mid-orbit avoid buffer dumps, each WFC3 orbit has been made into a different visit. Furthermore, we will utilise 3 orbits of time to observer DS Tuc A with COS and STIS to understand the planet's irradiation environment. We will take exposures with STIS G230L, G430L, and G750L as well as with COS G140L. ------------------------------------------------------------------------------------ 17832( 9) - 02-Jul-2025 12:15:07 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 HD-222259A STAR, EXTRA-SOLAR RA=23H39M39.4808S +/- J2000 V = 8.226 PLANET 0.0736336", DEC=-69D11'44.71" +/- 0.0451044" Reference Frame: ICRS Extended: NO 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 0.014927611885390706 -0.06755100000646053 0.022636700000000003 ------------------------------------------------------------------------------------------------------------------------------------ 17832( 9) - 02-Jul-2025 12:15:07 - [ 4] Visit: 01 (WFC3 G141 Transit) Visit Requirements: SCHED 70%; ORIENT 80D TO 220 D; ORIENT 260D TO 40 D; Period 8.1382123415 D AND ZERO-PHASE HJD2458332.3098858669 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 HD-222259A WFC3/IR MULTIAC GRISM512 F130N NSAMP=3, SAMP-SEQ=RAPID 1 DEF (2.559 PHASE 0.97 TO 0.976; SEQ CUM S) 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A WFC3/IR MULTIAC GRISM256 G141 NSAMP=2, SAMP-SEQ=RAPID 3 DEF (1.667 POS TARG -30, null CUM S) ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 14 DEF POS TARG -30, -27; CUM (1307.475 SPATIAL SCAN 0.930386, S) 90.0 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 WFC3/IR MULTIAC GRISM512 F130N none none none none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 5] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 6] Visit: 02 (WFC3 G141 Transit) Visit Requirements: SCHED 70%; ORIENT 80D TO 220 D; ORIENT 260D TO 40 D; AFTER 01 BY 0.95 Orbits TO 1.05 Orbits 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 HD-222259A WFC3/IR MULTIAC GRISM256 G141 NSAMP=2, SAMP-SEQ=RAPID 2 DEF (1.111 POS TARG -30, null; SEQ CUM S) 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 14 DEF POS TARG -30, -27; CUM (1307.475 SPATIAL SCAN 0.930386, S) 90.0 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A CUM HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 7] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 8] Visit: 03 (WFC3 G141 Transit) Visit Requirements: SCHED 70%; ORIENT 80D TO 220 D; ORIENT 260D TO 40 D; AFTER 02 BY 0.95 Orbits TO 1.05 Orbits 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 HD-222259A WFC3/IR MULTIAC GRISM256 G141 NSAMP=2, SAMP-SEQ=RAPID 2 DEF (1.111 POS TARG -30, null; SEQ CUM S) 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 14 DEF POS TARG -30, -27; CUM (1307.475 SPATIAL SCAN 0.930386, S) 90.0 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 1 DEF POS TARG -30, -27; CUM (46.696 S) SPATIAL SCAN 0.930386, 90.0 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A CUM HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 9] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none none none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 10] Visit: 04 (WFC3 G141 Transit) Visit Requirements: SCHED 70%; ORIENT 80D TO 220 D; ORIENT 260D TO 40 D; AFTER 03 BY 0.95 Orbits TO 1.05 Orbits 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 HD-222259A WFC3/IR MULTIAC GRISM256 G141 NSAMP=2, SAMP-SEQ=RAPID 2 DEF (1.111 POS TARG -30, null; SEQ CUM S) 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 14 DEF POS TARG -30, -27; CUM (1307.475 SPATIAL SCAN 0.930386, S) 90.0 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 1 DEF POS TARG -30, -27; CUM (46.696 S) SPATIAL SCAN 0.930386, 90.0 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A CUM HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 11] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none none none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 12] Visit: 05 (WFC3 G141 Transit) Visit Requirements: SCHED 70%; ORIENT 80D TO 220 D; ORIENT 260D TO 40 D; AFTER 04 BY 0.95 Orbits TO 1.05 Orbits 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 HD-222259A WFC3/IR MULTIAC GRISM256 G141 NSAMP=2, SAMP-SEQ=RAPID 2 DEF (1.111 POS TARG -30, null; SEQ CUM S) 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 14 DEF POS TARG -30, -27; CUM (1307.475 SPATIAL SCAN 0.930386, S) 90.0 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 1 DEF POS TARG -30, -27; CUM (46.696 S) SPATIAL SCAN 0.930386, 90.0 Degrees, Forward ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A CUM HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 13] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none none none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 14] Visit: 06 (WFC3 G141 Transit) Visit Requirements: SCHED 70%; ORIENT 80D TO 220 D; ORIENT 260D TO 40 D; AFTER 05 BY 0.95 Orbits TO 1.05 Orbits 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 HD-222259A WFC3/IR MULTIAC GRISM256 G141 NSAMP=2, SAMP-SEQ=RAPID 3 DEF (1.667 POS TARG -30, null; SAA CUM S) CONTOUR 25; SEQ 1-3 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 14 DEF POS TARG -30, -27; CUM (1307.475 SPATIAL SCAN 0.930386, S) 90.0 Degrees, Round trip; SAA CONTOUR 25 ------------------------------------------------------------------------------------------------------------------------------------ 3 HD-222259A WFC3/IR MULTIAC GRISM512 G141 SAMP-SEQ=SPARS25, NSAMP=3 1 DEF POS TARG -30, -27; CUM (46.696 S) SPATIAL SCAN 0.930386, 90.0 Degrees, Forward; SAA CONTOUR 25 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 1 none 1 N/A CUM HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 2 none 1 N/A CUM HD-222259A 1 WFC3/IR MULTIAC GRISM256 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 1 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 2 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 3 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 4 none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 15] 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 5 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 6 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 7 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 8 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 9 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 10 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 11 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 12 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 13 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 2 WFC3/IR MULTIAC GRISM512 G141 none none 14 none 1 N/A CUM HD-222259A 3 WFC3/IR MULTIAC GRISM512 G141 none none none none 1 N/A CUM 17832( 9) - 02-Jul-2025 12:15:07 - [ 16] Visit: 07 (STIS) Visit Requirements: SCHED 70% 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 HD-222259A STIS/CCD ACQ F28X50OII MIRROR ACQTYPE=POINT 1 2 S (2 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 HD-222259A STIS/CCD ACCUM 52X0.2 G750L 7751 CR-SPLIT=2 1 16 S (16 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 CCDFLAT STIS/CCD ACCUM 0.3X0.09 G750L 7751 2 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 HD-222259A STIS/CCD ACCUM 52X0.2 G430L 4300 CR-SPLIT=2 1 30 S (30 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 HD-222259A STIS/CCD ACCUM 52X0.2 G230LB 2375 CR-SPLIT=6 1 1026 S (1026 S) ------------------------------------------------------------------------------------------------------------------------------------ 6 HD-222259A STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=500 1 2743 S -MAMA G (2743 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 | ------------------------------------------------------------------------------------------------------------------------------------ HD-222259A 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A I HD-222259A 2 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 1 1 N/A HD-222259A 2 STIS/CCD ACCUM 52X0.2 G750L 7751 none none none 2 1 N/A CCDFLAT 3 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 1 N/A CCDFLAT 3 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 1 N/A HD-222259A 4 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none 1 1 N/A HD-222259A 4 STIS/CCD ACCUM 52X0.2 G430L 4300 none none none 2 1 N/A HD-222259A 5 STIS/CCD ACCUM 52X0.2 G230LB 2375 none none none 1 1 N/A HD-222259A 5 STIS/CCD ACCUM 52X0.2 G230LB 2375 none none none 2 1 N/A HD-222259A 5 STIS/CCD ACCUM 52X0.2 G230LB 2375 none none none 3 1 N/A HD-222259A 5 STIS/CCD ACCUM 52X0.2 G230LB 2375 none none none 4 1 N/A HD-222259A 5 STIS/CCD ACCUM 52X0.2 G230LB 2375 none none none 5 1 N/A HD-222259A 5 STIS/CCD ACCUM 52X0.2 G230LB 2375 none none none 6 1 N/A HD-222259A 6 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 2 N/A -MAMA G 17832( 9) - 02-Jul-2025 12:15:07 - [ 17] Summary Form for Proposal 17832 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.3X0.09, 52X0.2, F28X50OII, GRISM256, GRISM512 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, MULTIACCUM, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=POINT, BUFFER-TIME=500, CR-SPLIT=2, CR-SPLIT=6, NSAMP=2, NSAMP=3, SAMP-SEQ=RAPID, SAMP-SEQ=SPARS25 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 0.95 Orbits TO 1.05 Orbits, AFTER 02 BY 0.95 Orbits TO 1.05 Orbits, AFTER 03 BY 0.95 Orbits TO 1.05 Orbits, AFTER 04 BY 0.95 Orbits TO 1.05 Orbits, AFTER 05 BY 0.95 Orbits TO 1.05 Orbits, ORIENT 260D TO 40 D, ORIENT 80D TO 220 D, PHASE 0.97 TO 0.976, POS TARG -30, -27, POS TARG -30, null, Period 8.1382123415 D AND ZERO-PHASE HJD2458332.3098858669, SAA CONTOUR 25, SCHED 70%, SEQ 1-2 NON-INT, SEQ 1-3 NON-INT, SPATIAL SCAN 0.930386, 90.0 Degrees, Forward, SPATIAL SCAN 0.930386, 90.0 Degrees, Round trip ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F130N, G140L, G141, G230LB, G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names CCDFLAT, HD-222259A ------------------------------------------------------------------------------------------------------------------------------------