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EP: Fachverband Extraterrestrische Physik

EP 3: Astrobiologie

EP 3.4: Vortrag

Dienstag, 13. März 2012, 15:00–15:15, V55.02

Characterization of the plasma environment around Hot Jupiters — •Kristina Kislyakova^1,6, Helmut Lammer², Mats Holmström³, Maxim Khodachenko², Jean-Mathias Grießmeier⁴, Igor Alexeev⁵, Elena Belenkaya⁵, Arnold Hanslmeier⁶, and Erkaev Nikolai⁷ — ¹N. I. Lobachevsky State University, University of Nizhnij Novgorod, Russian Federation — ²Austrian Academy of Sciences, Space Research Institute, Graz, Austria — ³Swedish Institute of Space Physics, Kiruna, Sweden — ⁴Laboratoire de Physique et Chimie de l'Environnement et de l'Espace and Observatoire des Sciences de l'Univers en region Centre, Orleans, France — ⁵Skobelitsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Russian Federation — ⁶Institut für Physik, IGAM, Universität Graz, Austria — ⁷Institute of Computational Modeling, Russian Academy of Sciences, Krasnoyarsk, Russian Federation

Spectroscopic observations with the Hubble Space Telescope (HST) of the Jupiter-type gas giant HD 209458b have shown a broad absorption signature at the Lyman-α stellar line during transit, suggesting the presence of a thick cloud of low and high velocity H atoms around the exosolar gas giant. The production of high velocity energetic neutral atoms (ENAs) as a result between the interaction of the stellar wind and the exosphere of the exoplanet will be discussed and shown that the HST/STIS observations of fast H atoms can be explained by assuming expected values for the stellar wind plasma, exosphere, and magnetosphere parameters.