TESS light curve analysis for J06574+740. Top: PDCSAP light curves for J06574+740 from sector 40 (left) and 47 (right). The light curves exhibit a ‘beating’ pattern, suggestive of there being two stars with very similar rotation periods. Bottom: periodograms showing a main peak at 0.608 d and a smaller but still highly significant peak at ∼0.63 d, which could be the rotational signal from a binary companion or from differential rotation.