0Assigned ID: 4407
----- Attempting Submission 1 (Wed May 24 16:42:30 GMT 2023) -----
HST Phase I Proposal 4407 successfully submitted.
Receipt: # 4407-10----- Attempting Submission 1 (Thu Sep 14 13:19:20 GMT 2023) -----
HST Phase II Proposal 17489 successfully submitted.
Receipt: # 17489-1
----- Attempting Submission 2 (Sun Apr 07 16:34:16 GMT 2024) -----
----- Attempting Submission 3 (Tue Oct 22 19:18:54 GMT 2024) -----Hunting for Hazes in the Atmosphere of a Warm Super-PuffWe 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.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.Dr. Shreyas Vissapragada is an expert in observations and modeling of exoplanet atmospheric escape. He helped discover TOI-1420b, measure its mass, and detect its outflowing atmosphere.
Mr. Carlos Gascon is an expert in WFC3/UVIS G280 observations and data processing. He has produced a successful data reduction pipeline for this instrument currently being used in the HUSTLE Treasury program.
Dr. Mercedes Lopez-Morales is an expert in observations of transiting exoplanet atmospheres. She has led a number of programs with HST and JWST that have successfully characterized atmospheric physics and composition.
Dr. Khalid Barkaoui is an expert in ground-based photometric observations and processed the LCOGT observations that were initially suggestive of a scattering slope for TOI-1420b.
Dr. David W Latham is an expert in exoplanet mass measurements using the radial velocity technique. He led the HARPS-N group that ultimately measured the mass of TOI-1420b.
Dr. Jessica Spake is an expert in the use of ground- and space-based facilities (especially WFC3) for measuring exoplanet atmospheric composition and atmospheric escape.Exoplanets and Exoplanet Formation6falsefalsetruefalsefalsefalsefalsefalseAVAILABLESTARG V-IVThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000J2000WFC3/UVISSpectroscopicNoNoG280/private/var/folders/jl/jpsf_f1502j0b9g89tkhxxyc0000gn/T/OPVisit9633062117801761144.xmlThe scheduling data was generated by CASM 32.1.3.CASM was run in Phase II mode.1726883591000142.33291619340122(Tic-Visit
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