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Fig. 5


Flux integrated in the blue wing of the Lyman-α line over −94 to −41 km s−1 (upper panel), and in the red wing over 23 – 76 km s−1 (lower panel). Visits A, B, and C are plotted in blue, green, and red. Fluxes are normalized by the average flux over orbits 1, 2, and 5. Time is relative to the mid-transit of GJ 3470b (contacts are shown as vertical dashed lines). Exposures occurring at similar times in each visit have been binned into the black points. Orbit 1 in Visit C has been excluded from the normalization, and the binning because of its spurious flux decreases between +38 and +116 km s−1.

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