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We present self-consistent three-dimensional climate simulations of possiblehabitable states for the newly discovered Habitable Zone Earth-sized planet,TOI-700 d. We explore a variety of atmospheric compositions, pressures, androtation states for both ocean-covered and completely desiccated planets inorder to assess the planet's potential for habitability. For all 20 of oursimulated cases, we use our climate model outputs to synthesize transmissionspectra, combined-light spectra, and integrated broadband phase curves. Theseclimatologically-informed observables will help the community assess thetechnological capabilities necessary for future characterization of this planet- as well as similar transiting planets discovered in the future - and willprovide a guide for distinguishing possible climate states if one day we doobtain sensitive spectral observations of a habitable planet around a M-star.We find that TOI-700 d is a strong candidate for a habitable world and canpotentially maintain temperate surface conditions under a wide variety ofatmospheric compositions. Unfortunately, the spectral feature depths from theresulting transmission spectra and the peak flux and variations from oursynthesized phase curves for TOI-700 d do not exceed 10 ppm. This will likelyprohibit the James Webb Space Telescope (JWST) from characterizing itsatmosphere; however, this motivates the community to invest in futureinstrumentation that perhaps can one day reveal the true nature of TOI-700 d,and to continue to search for similar planets around less distant stars.

The First Habitable Zone Earth-sized Planet from TESS. III: Climate States and Characterization Prospects for TOI-700 d