Fig. 2

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Speed of the equatorial jet throughout an orbit for each planet. The speed is computed as the maximum of the zonal wind speed between 100 and 0.01 bar after averaging over 1/50th of the orbital period, taking the zonal mean across the whole planet and the meridional mean between ±20°. We calculated the equatorial jet speed at 50 times and used cubic interpolation between these 50 times. Note that each panel has a different scaling on the two axes. The equatorial jet speed is quite consistent on HAT-P-2 b, TOI-3362 b, and HD 17156 b, apart from some erratic behaviour around the periastron passage. On HD 80606 b and TOI-4127 b, however, it slows down considerably over the orbit after a period of acceleration after the periastron passage.
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