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Energetic Neutral Atoms Around HD 209458b: Estimations of Magnetospheric Properties

hal.structure.identifierSwedish Institute of Space Physics [Kiruna] [IRF]
dc.contributor.authorEKENBÄCK, A.
hal.structure.identifierSwedish Institute of Space Physics [Uppsala / Kiruna] [IRF]
dc.contributor.authorHOLMSTRÖM, M.
hal.structure.identifierPhysikalisches Institut [Bern]
dc.contributor.authorWURZ, P.
dc.contributor.authorGRIESSMEIER, Jean-Mathias
hal.structure.identifierSpace Research Institute of Austrian Academy of Sciences [IWF]
dc.contributor.authorLAMMER, H.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorSELSIS, Franck
hal.structure.identifierINAF - Osservatorio Astronomico di Palermo
dc.contributor.authorPENZ, T.
dc.date.issued2010-02
dc.identifier.issn0004-637X
dc.description.abstractEnHD 209458b is an exoplanet found to transit the disk of its parent star. Observations have shown a broad absorption signature about the Lyα stellar line during transit, suggesting the presence of a thick cloud of atomic hydrogen around the "hot Jupiter" HD 209458b. This work expands on an earlier work studying the production of energetic neutral atoms (ENAs) as a result of the interaction between the stellar wind and the exosphere. We present an improved flow model of HD 209458b and use stellar wind values similar to those in our solar system. We find that the ENA production is high enough to explain the observations, and we show that—using expected values for the stellar wind and exosphere—the spatial and velocity distributions of ENAs would give absorption in good agreement with the observations. We also study how the production of ENAs depends on the exospheric parameters and establish an upper limit for the obstacle standoff distance at approximately 4-10 planetary radii. Finally, we compare the results obtained for the obstacle standoff distance with existing exomagnetospheric models and show how the magnetic moment of HD 209458b can be estimated from ENA observations.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.subject.enmethods: data analysis
dc.subject.enmethods: numerical
dc.subject.enstars: winds
dc.subject.enoutflows
dc.title.enEnergetic Neutral Atoms Around HD 209458b: Estimations of Magnetospheric Properties
dc.typeArticle de revue
dc.identifier.doi10.1088/0004-637X/709/2/670
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.journalThe Astrophysical Journal
bordeaux.page670-679
bordeaux.volume709
bordeaux.peerReviewedoui
hal.identifierhal-00522261
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00522261v1
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