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Fig. 2

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Results of the cross-correlation analyses. (a) CCFs at the KP presenting the maximum significance peak. (b) Cross-correlation maps (expressed as S/N) of potential signals for H2O (left), HCN (middle), and NH3 (right) with respect to the exoplanet rest-frame velocity (horizontal axis) and KP (vertical axis). The horizontal dashed lines mark the expected KP of WASP-76 b (~196 km s−1). (c) Cross-correlation matrices in the Earth rest-frame. The transit occurs between the horizontal dashed lines and the tilted dashed lines mark the velocities of the highest significance signal. Larger versions of the cross-correlation matrices in the Earth’s rest frame and in the rest-frame of the exoplanet are shown in Appendix B.

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