Top: part of KOI-1452 light curve. There are clear periodic variations, suggesting the appearance of spots in the visible stellar hemispheres (see text for details). The primary eclipses are indicated with green markers. Middle: the L-S periodogram of the total Kepler light curve. The unshaded part around the area with the most significant periodicities is shown enlarged in the lower panel. Bottom: the red shaded area shows the values of the periodogram with false alarm probability higher than 10^-3. The four most prominent periods of the L-S periodogram with periods of P₁ = 1.516 days, P₂ = 1.4097 days, P₃ = 1.1978 days and P₄ = 1.1702 days are indicated by black arrows, while the red arrow indicates the orbital period of the system (P_orb = 1.1522 days).