Photochemistry in TESS's first habitable zone terrestrial planet, TOI-700 d

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 …