Fig. 13
Mixing ratios of hydrogen species calculated assuming solar metallicity, equilibrium chemistry, and isothermal temperature. The upper panel is for WASP-33b (2700 K) and the lower panel is for KELT-9b (4000 K). In both planets, H− exists at low altitudes and is the main opacity source of the spectral continuum. The calcium profiles are also plotted as dashed lines.
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