Stuttgart 2012 – wissenschaftliches Programm
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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 Kislyakova1,6, 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.