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Fig. 3

image

Influence of the temperature at the lower boundary on the mass-loss rates. Temperature structure a) and the heating rate b) in the lower atmosphere of HD 209458 b are shown along with the change in the mass-loss rate c) in the planets HD 209458 b and HD 189733 b. The color scheme in panels a) and b) indicates the boundary temperature from −400 K (dark blue) to + 400 K (green). A higher boundary temperature results in a slightly higher mass-loss rate.

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