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Fig. 7

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STELLA photometry of K2-138 at a predicted transit of planet e. The solid red line shows the best-fit model, including a transit model of fixed shape and time. The solid green line is a second-order time-dependent polynomial without a transit event. 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. At the predicted time of transit (vertical solid line, Lopez et al. 2019), the transit model is significantly disfavored. Vertical dashed lines denote the 1 σ uncertainty of the transit time prediction.

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