16915( 5) - 17-May-2022 14:23:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16915 Version: 5 Check-in Time: 17-May-2022 14:23:33 STScI Edit Number: 0 Title Unravelling the Mysteries of LTT 9779 b - Studying Clouds that Shouldn't Exist on a Planet that Shouldn't Exist ------------------------------------------------------------------------------------ Type Cycle GO 29 ------------------------------------------------------------------------------------ Investigators Contact? PI: Michael Radica Universite de Montreal Y CoI: Jake Taylor Universite de Montreal N CoI: Dr. David Lafreniere Universite de Montreal N CoI: Dr. Hannah Wakeford University of Bristol N CoI: Dr. Vivien Parmentier University of Oxford N CoI: Prof. Nicolas B Cowan McGill University N CoI: Dr. James Jenkins Universidad de Chile N CoI: Sergio Hoyer Laboratoire d'Astrophysique de Marseille N CoI: Dr. Romain Allart Universite de Montreal N ------------------------------------------------------------------------------------ Abstract Our current understanding of the evolution of exoplanet atmospheres predicts the existence of a so-called 'hot-Neptune desert' - a dearth of Neptune-mass planets with orbital periods less than four days, and this prediction has so far been borne-out by observations. The discovery of LTT 9779b, a roughly two Neptune-mass planet with an orbital period of less than a day, thus provides a challenge to the current atmosphere evolution paradigm. LTT 9779b is currently the only known ultra-hot-Neptune, and Spitzer/IRAC observations find tentative evidence for an atmosphere with observable molecular signatures. Although we expect the atmospheres of hot planets to be dark at UV/optical wavelengths, TESS and CHEOPS measurements show evidence of a significant amount of light scattering from the atmosphere of LTT 9779b - likely indicating the presence of clouds. We here propose to leverage the unique capabilities of the WFC3 instrument's UVIS channel to conduct a spectroscopic study of scattered light from the atmosphere of LTT 9779b during its eclipse. Such observations will allow us to constrain the planet's energy budget, as well as robustly discern the presence of, and quantify the composition of clouds in its atmosphere. This program will be highly complementary to the planned JWST/NIRISS observations, and facilitate a deeper understanding of one of the most unique worlds discovered to date. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to measure the energy budget and constrain the presence and composition of clouds in the atmosphere of LTT 9779b, the only known member of the hot-Neptune desert to have retained a substantial gaseous envelope, via observations of scattered light during its eclipse. Due to its extreme levels of irradiation, LTT 9779b is the best sub-Saturn planet for such a study, and we have shown in the previous section that multiple lines of evidence indicate the presence of clouds in its atmosphere. The UVIS channel of HST/WFC3 is the best instrument to carry out these observations. These science goals require observations in the blue-optical and near UV, where the planet's thermal 16915( 5) - 17-May-2022 14:23:33 - [ 2] contribution is negligible, and the scattered signature of cloud condensates can be observed. Such observations will be impossible with the JWST, which only can observe down to 0.6 microns. Wakeford et al. (2020) demonstrated that for targets fainter than V = 7 the G280 grism yields reduced systematics, as well as higher resolution, precision and wavelength coverage than either STIS gratings (the V magnitude of LTT 9779 is 9.79). Our program also requires a sensitivity and stability that is currently beyond the reach of ground-based instruments operating in a similar wavelength range, and the critical NUV wavelength regime which enables the distinguishing between various cloud models is highly attenuated by the Earth's atmospher. Thus, ground based observations, even if they could reach a comparable sensitivity to the HST, would not be of the same scientific value as our proposed program. We include three eclipses in our program, requiring a total of 12 orbits, to ensure that we reach the required sensitivity to provide, at minimum, the most robust upper limit of geometric albedo for an ultra-hot sub-Saturn planet. Using a publicly available tool (Wakeford et al., 2020), we simulated the precision that would be obtained with the G280 grism with three eclipses, as well as the corresponding achievable photometric precision if the spectrum were to be completely binned down. This tool has shown to accurately replicate the precision achieved by the observations of Wakeford et al. (2020). We find a photometric precision of 11 ppm when stacking all three eclipses. This is sufficient to detect the scattered light eclipse of LTT 9779 b at 3sigma if its geometric albedo is at least 0.2. Given that the existing TESS and CHEOPS observations indicate a significant scattered light signal, we predict a geometric albedo for LTT 9779 b of 0.4. We also note that unlike with the IR channel of WFC3, the first orbit of the UVIS channel can be fully used (Wakeford et al., 2020). ------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CD-38-15670 STAR, G V-IV RA=23H54M40.5304S, J2000 V = 9.76 DEC=-37D37'41.61" Reference Frame: Other: SIMBAD Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2015.5 0.020843303178745425 -0.06980099994962075 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 4] Visit: 01 (Eclipse 1) Visit Requirements: ORIENT 17.9D TO 125.3 D; ORIENT 211.8D TO 292.9 D; Period 1.58414044 D AND ZERO-PHASE HJD2458783.51636 On Hold Comments: Additional Comments: We have specified phase constraints of 0.1983 - 0.2005 for the start of each eclipse to ensure that the second orbit is centered on the eclipse midpoint. This assumes a mimum start time of mid eclipse - T14/2 - 96min (single HST orbit) - 5min (using a 5 minute starting window). With such a start window, we should be able to capture the entire ~40min T14 in the 47min observing window, with one orbit for baseline both before and after. Since the period of this planet is <1d, we have doubled the period to 1.584d and halved the resulting phases to overcome the limitations of the APT when handling short periods. We note that the propogated error on our ephemeris (Crossfield+ 2020) is ~2mins. We have placed orient constraints to avoid contamination of the spectral trace by two nearby stars. A bias frame will be taken at the end of each visit as we have specified a custom subarray for which the appropriate calibrations will not be already available. 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 CD-38-15670 WFC3/UVI ACCUM G280-REF F300X FLASH=18, CENTERAXIS1=2136, 1 3 S (3 S) POS TARG null, -50; S CENTERAXIS2=1200, PHASE SIZEAXIS1=2250, SIZEAXIS2=650 0.19521717983105924 TO 0.2035777181647932; SEQ 1-2 NON-INT Comments: FLASH=18 added to reach the 20e- nominal background count. 3s exposure in the F300X filter reaches S/N=427 which is sufficient. ------------------------------------------------------------------------------------------------------------------------------------ 2 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 19 60 S (1140 POS TARG null, -50 S CENTERAXIS2=1200, S) SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 5] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 3 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 4 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 4-5 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 5 BIAS WFC3/UVI ACCUM UVIS DEF CENTERAXIS1=2136, 4 0 S (0 S) S CENTERAXIS2=1200, SIZEAXIS1=2250, SIZEAXIS2=650 Comments: Bias frames with same setup and subarray size as science observations are required since we have used a custom subarray. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 6] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 1 WFC3/UVI ACCUM G280-REF F300X none none none none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 1 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 2 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 3 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 4 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 5 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 6 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 7 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 8 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 9 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 10 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 11 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 12 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 13 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 14 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 15 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 16 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 17 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 18 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 19 none 1 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 1 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 2 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 3 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 4 none 2 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 5 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 6 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 7 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 8 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 9 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 10 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 11 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 12 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 13 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 14 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 15 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 16 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 17 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 18 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 19 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 20 none 2 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 1 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 2 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 3 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 4 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 5 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 6 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 7 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 8 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 8] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 9 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 10 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 11 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 12 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 13 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 14 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 15 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 16 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 17 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 18 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 19 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 20 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 1 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 2 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 3 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 4 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 9] Visit: 02 (Eclipse 2) Visit Requirements: ORIENT 17.9D TO 125.3 D; ORIENT 211.8D TO 292.9 D; Period 1.58414044 D AND ZERO-PHASE HJD2458784.30843022 On Hold Comments: Additional Comments: We have specified phase constraints of 0.1983 - 0.2005 for the start of each eclipse to ensure that the second orbit is centered on the eclipse midpoint. This assumes a mimum start time of mid eclipse - T14/2 - 96min (single HST orbit) - 5min (using a 5 minute starting window). With such a start window, we should be able to capture the entire ~40min T14 in the 47min observing window, with one orbit for baseline both before and after. Since the period of this planet is <1d, we have doubled the period to 1.584d and halved the resulting phases to overcome the limitations of the APT when handling short periods. We note that the propogated error on our ephemeris (Crossfield+ 2020) is ~2mins. We have placed orient constraints to avoid contamination of the spectral trace by two nearby stars. A bias frame will be taken at the end of each visit as we have specified a custom subarray for which the appropriate calibrations will not be already available. 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 CD-38-15670 WFC3/UVI ACCUM G280-REF F300X FLASH=18, CENTERAXIS1=2136, 1 3 S (3 S) POS TARG null, -50; S CENTERAXIS2=1200, PHASE SIZEAXIS1=2250, SIZEAXIS2=650 0.19521717983105924 TO 0.2035777181647932; SEQ 1-2 NON-INT Comments: FLASH=18 added to reach the 20e- nominal background count. 3s exposure in the F300X filter reaches S/N=427 which is sufficient. ------------------------------------------------------------------------------------------------------------------------------------ 2 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 19 60 S (1140 POS TARG null, -50 S CENTERAXIS2=1200, S) SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 10] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 3 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 4 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 4-5 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 5 BIAS WFC3/UVI ACCUM UVIS DEF CENTERAXIS1=2136, 4 0 S (0 S) S CENTERAXIS2=1200, SIZEAXIS1=2250, SIZEAXIS2=650 Comments: Bias frames with same setup and subarray size as science observations are required since we have used a custom subarray. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 1 WFC3/UVI ACCUM G280-REF F300X none none none none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 1 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 2 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 3 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 4 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 5 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 6 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 7 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 8 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 9 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 10 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 11 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 12 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 13 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 14 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 15 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 16 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 17 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 18 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 19 none 1 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 1 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 2 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 3 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 4 none 2 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 12] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 5 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 6 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 7 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 8 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 9 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 10 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 11 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 12 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 13 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 14 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 15 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 16 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 17 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 18 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 19 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 20 none 2 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 1 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 2 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 3 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 4 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 5 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 6 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 7 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 8 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 9 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 10 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 11 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 12 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 13 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 14 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 15 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 16 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 17 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 18 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 19 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 20 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 1 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 2 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 3 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 4 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 14] Visit: 03 (Eclipse 3) Visit Requirements: ORIENT 17.9D TO 125.3 D; ORIENT 211.8D TO 292.9 D; Period 1.58414044 D AND ZERO-PHASE HJD2458783.51636 On Hold Comments: Additional Comments: We have specified phase constraints of 0.1983 - 0.2005 for the start of each eclipse to ensure that the second orbit is centered on the eclipse midpoint. This assumes a mimum start time of mid eclipse - T14/2 - 96min (single HST orbit) - 5min (using a 5 minute starting window). With such a start window, we should be able to capture the entire ~40min T14 in the 47min observing window, with one orbit for baseline both before and after. Since the period of this planet is <1d, we have doubled the period to 1.584d and halved the resulting phases to overcome the limitations of the APT when handling short periods. We note that the propogated error on our ephemeris (Crossfield+ 2020) is ~2mins. We have placed orient constraints to avoid contamination of the spectral trace by two nearby stars. A bias frame will be taken at the end of each visit as we have specified a custom subarray for which the appropriate calibrations will not be already available. 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 CD-38-15670 WFC3/UVI ACCUM G280-REF F300X FLASH=18, CENTERAXIS1=2136, 1 3 S (3 S) POS TARG null, -50; S CENTERAXIS2=1200, PHASE SIZEAXIS1=2250, SIZEAXIS2=650 0.19521717983105924 TO 0.2035777181647932; SEQ 1-2 NON-INT Comments: FLASH=18 added to reach the 20e- nominal background count. 3s exposure in the F300X filter reaches S/N=427 which is sufficient. ------------------------------------------------------------------------------------------------------------------------------------ 2 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 19 60 S (1140 POS TARG null, -50 S CENTERAXIS2=1200, S) SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 15] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 3 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 4 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 4-5 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 5 BIAS WFC3/UVI ACCUM UVIS DEF CENTERAXIS1=2136, 4 0 S (0 S) S CENTERAXIS2=1200, SIZEAXIS1=2250, SIZEAXIS2=650 Comments: Bias frames with same setup and subarray size as science observations are required since we have used a custom subarray. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 16] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 1 WFC3/UVI ACCUM G280-REF F300X none none none none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 1 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 2 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 3 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 4 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 5 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 6 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 7 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 8 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 9 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 10 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 11 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 12 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 13 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 14 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 15 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 16 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 17 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 18 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 19 none 1 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 1 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 2 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 3 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 4 none 2 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 17] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 5 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 6 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 7 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 8 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 9 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 10 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 11 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 12 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 13 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 14 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 15 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 16 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 17 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 18 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 19 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 20 none 2 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 1 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 2 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 3 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 4 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 5 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 6 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 7 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 8 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 18] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 9 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 10 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 11 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 12 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 13 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 14 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 15 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 16 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 17 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 18 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 19 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 20 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 1 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 2 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 3 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 4 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 19] Visit: 04 (Eclipse 4) Visit Requirements: ORIENT 17.9D TO 125.3 D; ORIENT 211.8D TO 292.9 D; Period 1.58414044 D AND ZERO-PHASE HJD2458784.30843022 On Hold Comments: Additional Comments: We have specified phase constraints of 0.1983 - 0.2005 for the start of each eclipse to ensure that the second orbit is centered on the eclipse midpoint. This assumes a mimum start time of mid eclipse - T14/2 - 96min (single HST orbit) - 5min (using a 5 minute starting window). With such a start window, we should be able to capture the entire ~40min T14 in the 47min observing window, with one orbit for baseline both before and after. Since the period of this planet is <1d, we have doubled the period to 1.584d and halved the resulting phases to overcome the limitations of the APT when handling short periods. We note that the propogated error on our ephemeris (Crossfield+ 2020) is ~2mins. We have placed orient constraints to avoid contamination of the spectral trace by two nearby stars. A bias frame will be taken at the end of each visit as we have specified a custom subarray for which the appropriate calibrations will not be already available. 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 CD-38-15670 WFC3/UVI ACCUM G280-REF F300X FLASH=18, CENTERAXIS1=2136, 1 3 S (3 S) POS TARG null, -50; S CENTERAXIS2=1200, PHASE SIZEAXIS1=2250, SIZEAXIS2=650 0.19521717983105924 TO 0.2035777181647932; SEQ 1-2 NON-INT Comments: FLASH=18 added to reach the 20e- nominal background count. 3s exposure in the F300X filter reaches S/N=427 which is sufficient. ------------------------------------------------------------------------------------------------------------------------------------ 2 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 19 60 S (1140 POS TARG null, -50 S CENTERAXIS2=1200, S) SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 20] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 3 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 4 CD-38-15670 WFC3/UVI ACCUM UVIS G280 FLASH=14, CENTERAXIS1=2136, 20 60 S (1200 POS TARG null, -50; SEQ S CENTERAXIS2=1200, S) 4-5 NON-INT SIZEAXIS1=2250, SIZEAXIS2=650 Comments: FLASH=14 added, which when combined with the natural background of about 6 e- per exposure will result in 20 e- and better CTE. To limit data volume, and hence buffer dumps, we have specified SIZEAXIS2=650 and SIZEAXIS1=2250. The target trace will occupy only a narrow range in y, so this is fine. CENTERAXIS1 & CENTERAXIS2 parameters have also been specified to center the target on chip 2. A POSTARG in the y-directon of -50 arcsec has been added to further center the target on chip 2. ------------------------------------------------------------------------------------------------------------------------------------ 5 BIAS WFC3/UVI ACCUM UVIS DEF CENTERAXIS1=2136, 4 0 S (0 S) S CENTERAXIS2=1200, SIZEAXIS1=2250, SIZEAXIS2=650 Comments: Bias frames with same setup and subarray size as science observations are required since we have used a custom subarray. ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ 16915( 5) - 17-May-2022 14:23:33 - [ 21] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 1 WFC3/UVI ACCUM G280-REF F300X none none none none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 1 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 2 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 3 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 4 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 5 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 6 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 7 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 8 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 9 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 10 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 11 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 12 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 13 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 14 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 15 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 16 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 17 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 18 none 1 N/A S CD-38-15670 2 WFC3/UVI ACCUM UVIS G280 none none 19 none 1 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 1 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 2 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 3 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 4 none 2 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 22] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 5 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 6 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 7 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 8 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 9 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 10 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 11 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 12 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 13 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 14 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 15 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 16 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 17 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 18 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 19 none 2 N/A S CD-38-15670 3 WFC3/UVI ACCUM UVIS G280 none none 20 none 2 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 1 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 2 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 3 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 4 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 5 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 6 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 7 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 8 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 23] 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 | ------------------------------------------------------------------------------------------------------------------------------------ CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 9 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 10 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 11 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 12 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 13 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 14 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 15 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 16 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 17 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 18 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 19 none 3 N/A S CD-38-15670 4 WFC3/UVI ACCUM UVIS G280 none none 20 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 1 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 2 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 3 none 3 N/A S BIAS 5 WFC3/UVI ACCUM UVIS DEF none none 4 none 3 N/A S 16915( 5) - 17-May-2022 14:23:33 - [ 24] Summary Form for Proposal 16915 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures G280-REF, UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CENTERAXIS1=2136, CENTERAXIS2=1200, FLASH=14, FLASH=18, SIZEAXIS1=2250, SIZEAXIS2=650 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 17.9D TO 125.3 D, ORIENT 211.8D TO 292.9 D, PHASE 0.19521717983105924 TO 0.2035777181647932, POS TARG null, -50, Period 1.58414044 D AND ZERO-PHASE HJD2458783.51636, Period 1.58414044 D AND ZERO-PHASE HJD2458784.30843022, SEQ 1-2 NON-INT, SEQ 3 NON-INT, SEQ 4-5 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements DEF, F300X, G280 ------------------------------------------------------------------------------------------------------------------------------------ Target Names BIAS, CD-38-15670 ------------------------------------------------------------------------------------------------------------------------------------