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Fig. 10

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STELLA photometry of K2-138 at a predicted transit of planet b following the ephemeris of Christiansen et al. (2018). Upper panel: five STELLA photometric time series. Middle panel: same photometry, detrended, phase-folded, and binned in 10 min intervals. The solid red line shows the Lopez et al. (2019) transit model. 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.

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