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We developed a dedicated statistical test for a massive detection of spot-and facula-crossing anomalies in multiple exoplanetary transit lightcurves,based on the frequentist $p$-value thresholding. This test was used to augmentour algorithmic pipeline for transit lightcurves analysis. It was applied to$1598$ amateur and professional transit observations of $26$ targets beingmonitored in the EXPANSION project. We detected $109$ statistically significantcandidate events revealing a roughly $2:1$ asymmetry in favor ofspots-crossings over faculae-crossings. Although some candidate anomalieslikely appear non-physical and originate from systematic errors, such asymmetrybetween negative and positive events should indicate a physical differencebetween the frequency of star spots and faculae. Detected spot-crossing eventsalso reveal positive correlation between their amplitude and width, possiblyowed to spot size correlation. However, the frequency of all detectablecrossing events appears just about a few per cent, so they cannot explainexcessive transit timing noise observed for several targets.

Massive search of spot- and facula-crossing events in 1598 exoplanetary transit lightcurves