STELLA photometry of K2-100b. The orbital phase is calculated according to the ephemeris of Barragán et al. (2019). The best-fit models with k and T₀ as free parameter are overplotted as solid red lines. The predicted times of first and forth contact are marked with vertical dotted lines. Lower panel: difference in the BIC of the best-fit model including the transit, in which the shape is fixed to the Barragán et al. (2019) transit parameters, and a model without the transit (detrending-only), when the transit is shifted along the x-axis. Values for light curves 1, 2, 3, 4, and 5 are given as solid, dashed, dotted, dashed-dotted, and long-dashed lines. The fifth light curve presents a significant detection crossing the Δ BIC threshold,while the second to forth light curves present tentative detections with minimum Δ BIC lower than −5.