0 Assigned ID: 290 ----- Attempting Submission 1 (Thu Mar 05 20:18:41 GMT 2020) ----- HST Phase I Proposal 290 successfully submitted. Receipt: # 290-1 ----- Attempting Submission 2 (Fri Mar 06 16:32:06 GMT 2020) ----- 0 ----- Attempting Submission 1 (Mon Jun 29 15:22:59 GMT 2020) ----- Recently, the TESS spacecraft uncovered an exciting three-planet system that included its first habitable zone terrestrial planet, TOI-700 d. This system orbits an M2V dwarf located 31 pc away from Earth. Previous studies of the TOI-700 system have not included photochemistry, but photochemistry can strongly impact planetary atmospheric composition, habitability, and observable spectral features. A critical input for accurate photochemical modeling of this system is the UV spectrum of the host star, TOI-700. Measured UV spectra of exoplanet host stars have been heavily used for a diverse range of modeling efforts and are a critical in-demand need of the exoplanet community. We will measure the UV spectrum of TOI-700 (1150-5000 A), use it to update previous modeling efforts of possible atmospheres and spectra of TOI-700 d, and make the spectrum available to the community. This will result in the first self-consistent model atmospheres for TOI-700 d using a 3-D climate model with clouds and atmospheric dynamics coupled to a photochemical and spectral model. We will be able to put this new analysis into the context of previous works considering climatically and photochemically self-consistent atmospheres and spectra of potentially habitable M dwarf planets. TOI-700 will be the earliest M dwarf for which such a study has been performed for a specific known planet and will thus provide a useful point of comparison against potentially habitable worlds around later M dwarfs, including TRAPPIST-1 (M8V). The stellar UV spectrum we measure will also be able to be used in future works considering the atmospheres and spectral features of all planets in the TOI-700 system. We will obtain a ~1150-5500 Ang spectrum of the M2 dwarf TOI-700 (d=31 pc) with the COS and STIS instruments over 15 orbits. The modes used are COS G140L (1121-2148 Ang; 10 orbits), STIS G230L (1570-3180 Ang; 5 orbits), and STIS G430L (2900-5700 Ang; short exposure at the end of one of the STIS G230L orbits). All UV MAMA exposures will use TIME-TAG mode to identify any flares. For both STIS gratings, we will use the 52"x0.2" slit, the minimum recommended slit width for accurate absolute flux calibration. For the COS target acquisition, we will forgo the time-intensive ACQ/SEARCH exposure because our target's coordinates are very precise (Gaia DR2). We have constrained our observations to take place within a period of 2 weeks to minimize the effects of stellar variability on the spectrum. Impact of reduced-gyro operations: low. This program has no orientation constraints, no spatial scans, and lots of orbital visibility in the visit planner. The only constraint we impose that could make scheduling difficulty in reduced-gyro mode is that all our visits take place within a period of 2 weeks. This constraint could be relaxed in the event of reduced-gyro operations with only a moderate impact on the science goals. Our team consists of experts in stellar observing, and in exoplanet climate, photochemical, and spectral modeling. The PI, Giada Arney, has extensively studied how photochemistry can impact the atmospheres, habitability, and observable properties of terrestrial planets within and beyond the solar system. She has led and co-authored numerous papers on this subject, including papers that involved coupling climate, photochemical, and spectral models. She is an expert and developer of the publicly-available Atmos photochemical code to be used here. She will lead the photochemical modeling and will update the Atmos code to include TOI-700. Co-I Allison Youngblood is a member of the HST MUSCLES stellar treasury survey. She has been the PI of three HST GO proposals, 1 AR proposal, and has been co-I on several others, including the Mega-MUSCLES program. She will lead the observations of TOI-700 and processing of the resulting stellar spectrum. Co-I Eric Wolf is an expert on the CAM 3-D climate model and will lead the climate modeling of TOI-700, coordinating with PI Arney to include the photochemical model results. Co-I Gabrielle Suissa led the first previous study analyzing the climate and spectraof TOI-700 d. She will integrate results from the coupled 3-D climate model and photochemical model, and she will generate photochemically self-consistent spectra of TOI-700 d with the assistance of Co-I Ravi Kopparapu, an expert in climate and atmosphere modeling, and Co-I Thomas Fauchez, an expert in climate, photochemical, and spectral modeling. Co-I Emily Gilbert led the discovery paper of TOI-700. Gilbert will, together with Co-I Joshua Schlieder, co-discover of TOI-700, provide expertise on the TOI-700 system. Co-Is Knicole Colon, Elisa Quintana, and Tom Barclay are experienced observers and who can provide advice and expertise on stellar characterization and HST observations. Co-I Eric Lopez is an expert in planet evolution and atmospheric escape and will guide insights into modeling atmospheric retention for all three planets in the system. 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