Gaia G _BP –G _RP color–magnitude diagram of stars hosting imaged substellar companions in this study. With the exception of 51 Eri, the bluest star in the figure, we focus on cool stars of F5 and later to avoid confusion between stellar rotation and pulsations in our light-curve analysis. Host stars are color-coded by rotation period and range from 0.08–44 days. Long rotation periods are either determined from multiple TESS sectors or are adopted from previous measurements in the literature.