Fig. 1

WASP-91b discovery data. Top panel: WASP lightcurve folded on the transit ephemeris. Middle panel: transit lightcurves from WASP (grey), TRAPPIST (green) and EulerCam (blue), offset for clarity, binned with a bin width of two minutes, and plotted chronologically with the most recent at the bottom. The best-fitting transit model is superimposed. Bottom panel: the CORALIE radial velocities with the best-fitting circular orbital model.
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