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We present the first results from MOPSS, The Michigan Optical PlanetarySpectra Survey, aimed at creating a database of optical planetary transmissionspectra all observed, reduced, and analyzed with a uniform method for thebenefit of enabling comparative exoplanet studies. We discuss our methods, andpresent results for our first two targets observed with the Magellan Baade 6.5mtelescope, one transit of the Hot Jupiter WASP-4b and two transits of the HotSaturn WASP-52b. Both targets present flat, featureless spectra, correspondingto the presence of aerosols. We find that the cloud decks must begin no lowerthan 10$^{-4}$ bar for both planets. For WASP-52b, we also consider the effectsof star spots on the transmission spectrum, including unocculted spots andspots on the stellar limb influencing the light curve limb darkeningparameters. We discuss the usefulness of this program in the coming James WebbSpace Telescope era.

MOPSS I: Flat Optical Spectra for the Hot Jupiters WASP-4 b and WASP-52b