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Stellar activity is one of the main obstacles to high-precision exoplanetobservations and has motivated extensive studies in detection andcharacterization problems. Most efforts focused on unocculted starspots inoptical transit spectrophotometry, while the impact of starspot crossings isassumed to be negligible in the near-infrared. Here, we present\textit{HST}/WFC3 transit observations of the active star WASP-52, hosting aninflated hot Jupiter, which present a possible starspot occultation signal. Byusing this data set as a benchmark, we investigated whether the masking of thetransit profile distortion or modeling it with both a starspot model and aGaussian process affects the shape of the transmission spectrum. Differentmethods produced spectra with the same shape and a robust detection of watervapor, and with $\lesssim 1 \sigma$ different reference radii for the planet.The solutions of all methods are in agreement and reached a similar level ofprecision. Our WFC3 light curve of WASP-52b hints that starspot crossings mightbecome more problematic with \textit{JWST}'s higher sensitivity and completecoverage of the transit profile.

Starspot occultations in infrared transit spectroscopy: the case of WASP-52b