Fig. 1
Mean line profile of a single KELT-20 spectrum obtained with the LSD software and Teff = 10 000 K (solid blue line) along with the rotational broadening fit (dash-dotted orange line). For comparison, the mean line profile of the same spectrum with the Teff = 9000 K is shown (dashed green line). The Doppler shadow of the planet is clearly visible as a bump in both lines.
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