HR: 0800h
AN: SH12A-0857    [Abstracts]
TI: Energetic Neutral Atoms Around the Extrasolar Planet HD 209458b
AU: * Holmström, M
EM: matsh@irf.se
AF: Swedish Institute of Space Physics, PO Box 812, Kiruna, 98128, Sweden
AU: Ekenbäck, A
EM: andreas@irf.se
AF: Swedish Institute of Space Physics, PO Box 812, Kiruna, 98128, Sweden
AU: Selsis, F
EM: franck.selsis@ens-lyon.fr
AF: Centre de Recherche en Astrophysique de Lyon (CRAL), and École Normale Supérieure (ENS), 46, allée d'Italie, Lyon, 69364, France
AU: Penz, T
EM: tpenz@astropa.inaf.it
AF: Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Palermo Giuseppe S.\ Vaiata, Piazza del Parlamento 1, Palermo, 90134, Italy
AU: Lammer, H
EM: helmut.lammer@oeaw.ac.at
AF: Space Research Institute, Austrian Academy of Sciences, Schmiedlstraße 6, Graz, 8042, Austria
AU: Wurz, P
EM: peter.wurz@space.unibe.ch
AF: University of Bern, Hochschulstrasse 4, Bern, 3012, Switzerland
AB: Observed atomic hydrogen absorption in the stellar Lyman-alpha line by the planet HD 209458b shows hydrogen with high velocity at great distances from the planet. This has been interpreted as hydrogen atoms undergoing hydrodynamic escape. We estimate the production of energetic neutral atoms from the interaction of the stellar wind with the extrasolar planet HD 209458b, and the implications for observations of atomic hydrogen. The estimated production of hydrogen-energetic neutral atoms is compared with observations.
DE: 0328 Exosphere
DE: 0343 Planetary atmospheres (5210, 5405, 5704)
DE: 0545 Modeling (4255)
DE: 2151 Neutral particles (7837)
DE: 6296 Extra-solar planets
SC: SPA-Solar and Heliospheric Physics [SH]
MN: 2007 Fall Meeting