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Energetic Neutral Atoms Around the Extrasolar Planet HD 209458b

P-73, 5 th Alfven Conference, 4-8 October, 2010. Energetic Neutral Atoms Around the Extrasolar Planet HD 209458b. M. Holmström 1 , A. Ekenbäck 1 , F. Selsis 2 , T. Penz 3 , H. Lammer 4 and P.Wurz 5. Swedish Institute of Space Physics, Kiruna, Sweden

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Energetic Neutral Atoms Around the Extrasolar Planet HD 209458b

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  1. P-73, 5th Alfven Conference, 4-8 October, 2010 Energetic Neutral Atoms Around the Extrasolar Planet HD 209458b M. Holmström1, A. Ekenbäck1, F. Selsis2, T. Penz3, H. Lammer4 and P.Wurz5 • Swedish Institute of Space Physics, Kiruna, Sweden • Centre de Recherche en Astrophysique de Lyon (CRAL) and École Normale Supérieure (ENS), Lyon, France, • Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Palermo Giuseppe S. Vaiata, Palermo, Italy, • Space Research Institute, Austrian Academy of Sciences, Graz, Austria, • University of Bern, Switzerland Exospheric H Model m/s exoplanet ENAs star Observation 109 m Comparison of model predictions with Ly-α transit observed spectrum Model view from Earth of H cloud • Energetic Neutral Atoms (ENAs) can explain the observed Lyman α absorption near an extrasolar planet • Stellar wind properties can be inferred from Lyman α observations through ENAs matsh@irf.se www.irf.se/~matsh/

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