Holmström et al. reply

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Replying to: A. Lecavelier des Etangs, A. Vidal-Madjar & J.-M. Désert Nature 456, 10.1038/nature07402 (2008)

Lecavelier des Etangs et al.1 object to the conclusion by Holmström et al.2 that radiation pressure alone cannot explain the Lyman-α absorption observed3 during transits of HD 209458b. We agree that hydrogen atoms can be accelerated to large velocities by radiation pressure. However, with our model we cannot reproduce the observed spectrum, as shown in the Supplementary Information and Fig. 3 of ref. 2.

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  1. 1

    Lecavelier des Etangs, A., Vidal-Madjar, A. & Désert, J.-M. The origin of hydrogen around HD 209458b. Nature 456 10.1038/nature07402 (2008)

  2. 2

    Holmström, M. et al. Energetic neutral atoms as the explanation for the high-velocity hydrogen around HD 209458b. Nature 451, 970–972 (2008)

  3. 3

    Vidal-Madjar, A. et al. An extended upper atmosphere around the extrasolar planet HD209458b. Nature 422, 143–146 (2003)

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Holmström, M., Ekenbäck, A., Selsis, F. et al. Holmström et al. reply. Nature 456, E1–E2 (2008) doi:10.1038/nature07403

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