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Short wavelength exoplanet transit measurements have been used to probemass-loss in exoplanet atmospheres. We present the Swift-UVOT transit lightcurves for five hot Jupiters orbiting UV-bright F-type stars: XO-3, KELT-3,WASP-3, WASP-62, and HAT-P-6. We report one positive transit detection of XO-3band one marginal detection of KELT-3b. We place upper limits on the remainingthree transit depths. The planetary radii derived from the NUV transit depthsof both potential detections are 50-100% larger than their optical radiusmeasurements. We examine the ratio $R_{\rm NUV}/R_{\rm opt}$ for trends as afunction of estimated mass-loss rate, which we derive from X-ray luminosityobtained from the Swift-XRT, or XMM-Newton in the case of WASP-62. We find nocorrelation between the energy-limited photoevaporative mass-loss rate and the$R_{\rm NUV}/R_{\rm opt}$ ratio. We also search for trends based on theequilibrium temperature of the hot Jupiters. We find a possible indication of atransition in the $R_{\rm NUV}/R_{\rm opt}$ ratio around $T_{\rm eq} =1700~{\rm K}$, analogous to the trends found for NIR water features intransmission spectra. This might be explained by the formation of extendedcloud decks with silicate particles $\leq 1~\mu{\rm m}$. We demonstrate thatthe Swift-UVOT filters could be sensitive to absorption from aerosols inexoplanet atmospheres.

Five new hot-Jupiter transits investigated with Swift-UVOT