K2 light curve of K2-18 phase-folded to the maximum a-posteriori orbital period and time of mid-transit of K2-18c from Model 1. Four transit light curve models are over-plotted for various illustrative values of the assumed size of K2-18c: the 99% upper limit on rp,c (0.52 R⊕), 0.75 R⊕, 1 R⊕, and the size of K2-18b (2.38 R⊕). No transit of K2-18c is detected in the data.
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