Lomb-Scargle periodogram for the STELLA photometry (upper panel) and the HATnet photometry (lower panel). Horizontal dashed lines denote the power value of false-alarm probability (FAP) 0.01. Vertical dashed lines mark the period found by the sine fit. Middle panel: STELLA periodogram after one pre-whitening step. Significant frequencies remain, which we attribute to the sampling pattern and/or spot evolution.
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