17489( 6) - 23-Oct-2024 16:30:57 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17489 Version: 6 Check-in Time: 23-Oct-2024 16:30:57 STScI Edit Number: 2 Title Hunting for Hazes in the Atmosphere of a Warm Super-Puff ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Shreyas Vissapragada Carnegie Institution for Science, Y Observatories CoI: Dr. Mercedes Lopez-Morales Space Telescope Science Institute N CoI: Carlos Gascon Center for Astrophysics | Harvard & N Smithsonian CoI: David W Latham Smithsonian Institution Astrophysical N Observatory CoI: Dr. Khalid Barkaoui Université de Liège N CoI: Dr. Jessica Spake California Institute of Technology N ------------------------------------------------------------------------------------ Abstract We aim to constrain the presence of aerosols in the atmosphere of TOI-1420b, a warm (Teq = 960 K) super-puff planet with an exceptionally low density (0.08 g/cc). A leading hypothesis for the apparently inflated radii of super-puffs is high-altitude dust/haze lofted by atmospheric outflows. The atmospheres of this planet is indeed outflowing as evidenced by ground-based He 10830 A measurements, making it an ideal laboratory to study the interplay between aerosols and atmospheric outflows. In particular, lofted haze should produce a strong Rayleigh or super-Rayleigh scattering slope for the transmission spectrum in the optical/near-ultraviolet (NUV). In an efficient 10 orbit program with WFC3/UVIS G280, we will obtain an optical transmission spectrum for TOI-1420b between 200--800~nm to either confirm or rule out the presence of hazes. If hazes are ruled out by our observations, our measurement would instead implicate alternate mechanisms like tidal inflation. ------------------------------------------------------------------------------------ Observations Description ------------------------ We will measure the transmission spectrum of TOI-1420b using WFC3 UVIS/G280. We require two transit observations to achieve the required SNR and to mitigate the effects of stellar activity. We acquire in F300X at the beginning of each observation for wavelength calibration. We verified that none of our exposures come close to saturating the detectors using the ETC. Following successful observing methodologies demonstrated by the HUSTLE program, we center the target on chip2 of the detector using POS TARG Y = -50 arcsec. We use the SIZEAXIS keywords to minimize data volume, and the CENTERAXIS keywords to center the subarray readout on the target. On the F300X image, we use FLASH to avoid poor CTE as recommended by the ETC. All of these instrument settings have been extensively tested in previous WFC3 UVIS/G280 exoplanet programs, most notably the HUSTLE treasury program (17183), which limits risk. ------------------------------------------------------------------------------------ 17489( 6) - 23-Oct-2024 16:30:57 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 TOI-1420 STAR, G V-IV RA=21H31M46.0342S, J2000 V = 11.65 DEC=+66D20'56.42" 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 0.007558329922736845 0.031874 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 17489( 6) - 23-Oct-2024 16:30:57 - [ 3] Visit: 01 (TOI-1420 T1) Visit Requirements: Period 6.9561063 D AND ZERO-PHASE HJD2459517.43305 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 TOI-1420 WFC3/UVI ACCUM G280-REF F300X FLASH=16, CENTERAXIS1=2148, 1 30 S (30 POS TARG null, -50; S CENTERAXIS2=1208, S) PHASE 0.9750419123 TO SIZEAXIS1=2100, SIZEAXIS2=600 0.9770385593; SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 7 312 S POS TARG null, -50 S CENTERAXIS2=1208, (2184 S) SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 3 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 3 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 4 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; NEW S CENTERAXIS2=1208, (2272 S) OBSET FULL ACQ; SEQ 4 SIZEAXIS1=2100, SIZEAXIS2=600 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 5 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 5 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 6 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 6 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOI-1420 1 WFC3/UVI ACCUM G280-REF F300X none none none none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 1 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 2 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 3 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 4 none 1 N/A S 17489( 6) - 23-Oct-2024 16:30:57 - [ 4] 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 5 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 6 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 7 none 1 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 1 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 2 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 3 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 4 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 5 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 6 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 7 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 8 none 2 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 1 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 2 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 3 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 4 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 5 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 6 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 7 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 8 none 3 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 1 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 2 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 3 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 4 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 5 none 4 N/A S 17489( 6) - 23-Oct-2024 16:30:57 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 6 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 7 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 8 none 4 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 1 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 2 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 3 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 4 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 5 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 6 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 7 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 8 none 5 N/A S 17489( 6) - 23-Oct-2024 16:30:57 - [ 6] Visit: 02 (TOI-1420 T2) Visit Requirements: Period 6.9561063 D AND ZERO-PHASE HJD2459517.43305 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 TOI-1420 WFC3/UVI ACCUM G280-REF F300X FLASH=16, CENTERAXIS1=2148, 1 30 S (30 POS TARG null, -50; S CENTERAXIS2=1208, S) PHASE 0.9750419123 TO SIZEAXIS1=2100, SIZEAXIS2=600 0.9770385593; SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 7 312 S POS TARG null, -50 S CENTERAXIS2=1208, (2184 S) SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 3 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 3 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 4 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 4 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 5 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 5 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 6 TOI-1420 WFC3/UVI ACCUM UVIS G280 CENTERAXIS1=2148, 8 284 S POS TARG null, -50; SEQ S CENTERAXIS2=1208, (2272 S) 6 NON-INT SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOI-1420 1 WFC3/UVI ACCUM G280-REF F300X none none none none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 1 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 2 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 3 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 4 none 1 N/A S 17489( 6) - 23-Oct-2024 16:30:57 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 5 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 6 none 1 N/A S TOI-1420 2 WFC3/UVI ACCUM UVIS G280 none none 7 none 1 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 1 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 2 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 3 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 4 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 5 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 6 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 7 none 2 N/A S TOI-1420 3 WFC3/UVI ACCUM UVIS G280 none none 8 none 2 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 1 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 2 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 3 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 4 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 5 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 6 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 7 none 3 N/A S TOI-1420 4 WFC3/UVI ACCUM UVIS G280 none none 8 none 3 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 1 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 2 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 3 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 4 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 5 none 4 N/A S 17489( 6) - 23-Oct-2024 16:30:57 - [ 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 | ------------------------------------------------------------------------------------------------------------------------------------ TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 6 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 7 none 4 N/A S TOI-1420 5 WFC3/UVI ACCUM UVIS G280 none none 8 none 4 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 1 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 2 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 3 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 4 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 5 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 6 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 7 none 5 N/A S TOI-1420 6 WFC3/UVI ACCUM UVIS G280 none none 8 none 5 N/A S 17489( 6) - 23-Oct-2024 16:30:57 - [ 9] Summary Form for Proposal 17489 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures G280-REF, UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CENTERAXIS1=2148, CENTERAXIS2=1208, FLASH=16, SIZEAXIS1=2100, SIZEAXIS2=600 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements NEW OBSET FULL ACQ, PHASE 0.9750419123 TO 0.9770385593, POS TARG null, -50, Period 6.9561063 D AND ZERO-PHASE HJD2459517.43305, SEQ 1-2 NON-INT, SEQ 3 NON-INT, SEQ 4 NON-INT, SEQ 5 NON-INT, SEQ 6 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F300X, G280 ------------------------------------------------------------------------------------------------------------------------------------ Target Names TOI-1420 ------------------------------------------------------------------------------------------------------------------------------------