The origin of hydrogen around HD 209458b

Details The origin of hydrogen around HD 209458b The origin of hydrogen around HD 209458b

Nov 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008natur.456e...1l&link_type=abstract

Nature, Vol. 456, p. E1

Physics

10

Scientific paper

Using numerical simulation, Holmstrom et al. (2008) proposed a plausible alternative explanation of the observed Lyman-alpha absorption that was seen during the transit of HD 209458b (Vidal-Madjar et al. 2003). They conclude that radiation pressure alone cannot explain the observations and that a peculiar stellar wind is needed. Here we show that radiation pressure alone can in fact produce the observed high-velocity hydrogen atoms. We also emphasize that even if the stellar wind is responsible for the observed hydrogen, to have a sufficient number of atoms for charge exchange with stellar wind, the energetic neutral atom (ENA) model also needs a significant escape from the planet atmosphere of similar amplitude as quoted in Vidal-Madjar et al.(2003).

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