Fig. 8

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STELLA photometry of K2-138 at a predicted transit of planet c. The orbital phase is calculated according to the refined ephemeris of this work, Eq. (1). 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 Lopez 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, and 3 are given as solid, dashed, and dotted lines. For all three light curves, the minimum value of Δ BIC suggests a tentative instead of significant detection.
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