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We present an optical to near-infrared transmission spectrum of the inflatedhot Jupiter WASP-52b using three transit observations from the Space TelescopeImaging Spectrograph (STIS) mounted on the Hubble Space Telescope, combinedwith Spitzer/Infrared Array Camera (IRAC) photometry at 3.6 microns and 4.5microns. Since WASP-52 is a moderately active (log(Lx/Lbol) = -4.7) star, wecorrect the transit light curves for the effect of stellar activity usingground-based photometric monitoring data from the All-Sky Automated Survey forSupernovae (ASAS-SN) and Tennessee State University's Automatic ImagingTelescope (AIT). We bin the data in 38 spectrophotometric light curves from0.29 to 4.5 microns and measure the transit depths to a median precision of 90ppm. We compare the transmission spectrum to a grid of forward atmosphericmodels and find that our results are consistent with a cloudy spectrum andevidence of sodium at 2.3-sigma confidence, but no observable evidence ofpotassium absorption even in the narrowest spectroscopic channel. We find thatthe optical transmission spectrum of WASP-52b is similar to that of thewell-studied inflated hot Jupiter HAT-P-1b, which has comparable surfacegravity, equilibrium temperature, mass, radius, and stellar irradiation levels.At longer wavelengths, however, the best fitting models for WASP-52b andHAT-P-1b predict quite dissimilar properties, which could be confirmed withobservations at wavelengths longer than ~1 micron. The identification ofplanets with common atmospheric properties and similar system parameters willbe insightful for comparative atmospheric studies with the James Webb SpaceTelescope.

The HST PanCET Program: Hints of Na I & Evidence of a Cloudy Atmosphere for the Inflated Hot Jupiter WASP-52b