Fig. 3
RM +CLV effects of the Ca II K 3933.66 Å line for KELT-9b. Upper panel: observed transmission spectral matrix. Middle panel: simulated stellar line profile changes due to the RM + CLV effects with an f factor f = 2.1 (see text). Separate models of the CLV effect and RM effect are presented in Fig. 2. Bottom panel: transmission spectrum after the correction of the RM + CLV effects. The white horizontal lines label ingress and egress. The obvious shadow with a RV drift from −90 km s−1 at ingress to +90 km s−1 at egress is the planetary absorption.
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