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Hydrodynamical interaction of stellar and planetary winds: effects of charge exchange and radiation pressure on the observed Ly alpha absorption
Stockholm University, Faculty of Science, Department of Astronomy. CONICET – UNC, Argentina; Universidad Nacional de Córdoba, Argentina.
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Number of Authors: 52019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 487, no 4, p. 5788-5798Article in journal (Refereed) Published
Abstract [en]

Lyman alpha observations of the transiting exoplanet HD209458b enable the study of exoplanet exospheres exposed to stellar extreme ultraviolet (EUV) fluxes, as well as the interacting stellar wind properties. In this study we present 3D hydrodynamical models for the stellar-planetary wind interaction including radiation pressure and charge exchange, together with photoionization, recombination, and collisional ionization processes. Our models explore the contribution of the radiation pressure and charge exchange to the Ly alpha absorption profile in a hydrodynamical framework, and for a single set of stellar wind parameters appropriate for HD209458. We find that most of the absorption is produced by the material from the planet, with a secondary contribution of neutralized stellar ions by charge exchange. At the same time, the hydrodynamic shock heats up the planetary material, resulting in a broad thermal profile. Meanwhile, the radiation pressure yields a small velocity shift of the absorbing material. While neither charge exchange nor radiation pressure provides enough neutrals at the velocity needed to explain the observations at -100kms(-1) individually, we find that the two effects combined with the broad thermal profile are able to explain the observations.

Place, publisher, year, edition, pages
2019. Vol. 487, no 4, p. 5788-5798
Keywords [en]
hydrodynamics, radiation mechanisms: general, methods: numerical, planets and satellites: individual: HD 209458b
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-171974DOI: 10.1093/mnras/stz1725ISI: 000475888500099OAI: oai:DiVA.org:su-171974DiVA, id: diva2:1348334
Available from: 2019-09-04 Created: 2019-09-04 Last updated: 2019-09-04Bibliographically approved

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