Abstract
The orientation parameter effect of a hot Jupiter’s intrinsic dipole magnetic field on the flow structure in an extended gaseous (ionospheric) envelope of the planet is studied with a three-dimensional numerical simulation. For example, the hot Jupiter HD 209458b is considered. The magnitude of the planet’s magnetic momentum was set equal to 0.1 of the magnetic momentum of Jupiter. The parameters of the stellar wind’s magnetic field corresponding to the case of a super-Alfvén flow regime around the planet’s atmosphere was taken into account. Under such conditions, calculations have shown that a quasi-closed gaseous (ionospheric) envelope with an induced shock magnetosphere is formed around a hot Jupiter, with a detailed structure determined by the magnetic dipole’s slope angle. In this case, the mass-loss rate depends on the orientation of the planet’s dipole magnetic field and increases with an increasing angle between the direction to the star and the direction closest to the inner Lagrange point’s magnetic pole. This is due to the electromagnetic force increase that impedes the free movement of the matter in the emerging outflow when the magnetic pole approaches the inner Lagrange point.
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This study was supported by the Russian Science Foundation (contract no. 18-12-00447). The study was carried out using capacities of the collective usage center “Complex for modeling of the data of mega-class research equipment” of the National Research Center “Kurchatov Institute” (http://ckp.nrcki.ru/) and Interdepartmental Supercomputer Center of the Russian Academy of Sciences.
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Zhilkin, A.G., Bisikalo, D.V. & Kaygorodov, P.V. The Orientation Influence of a Hot Jupiter’s Intrinsic Dipole Magnetic Field on the Flow Structure in Its Extended Envelope. Astron. Rep. 64, 259–271 (2020). https://doi.org/10.1134/S1063772920030063
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DOI: https://doi.org/10.1134/S1063772920030063