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The James Webb Space Telescope (JWST) will measure exoplanet transmission andeclipse spectroscopy at un-precedented precisions to better understand planetstructure, dynamics, chemistry and formation. These are essential tools on themarch towards biosignature searches on potentially habitable planets. Weexplore a range of exoplanet atmospheric conditions and forecast the expectedresults with JWST. We take realistic CHIMERA models that match existing Spitzerand HST results and simulate the spectra achievable with the JWST MIRI + NIRCamGuaranteed Time Observations (GTO) survey. We then retrieve atmosphericparameters from these spectra to estimate the precision to which the planets'atmospheric compositions can be measured. We find that emission spectra havewell-constrained unimodal solutions but transmission spectra near 10X solarabundance and solar C/O ratios can suffer from bimodal solutions. Broadwavelength coverage as well as higher precision data can resolve bimodalsolutions and provide dramatically better atmospheric parameter constraints. Wefind that metallicities can be measured to within 20% to 170%, which approachesthe precisions on Solar System planets, and C/O ratios can be constrained to~10% to 60%, assuming that observers can leverage short wavelength data toselect the correct solution from the bimodal posteriors. These compositionalprecisions are sufficient to validate or refute predictions from disk formationmodels on final atmospheric abundances as long as their history is not erasedby planet evolution processes. We also show the extent to which eclipse mappingwith JWST is possible on our brightest system HD 189733 b.

Clear and Cloudy Exoplanet Forecasts for JWST: Maps, Retrieved Composition and Constraints on Formation with MIRI and NIRCam