The Orientation Influence of a Hot Jupiter’s Intrinsic Dipole Magnetic Field on the Flow Structure in Its Extended Envelope
| Autor: | A. G. Zhilkin, P. V. Kaygorodov, Dmitry Bisikalo |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
010308 nuclear & particles physics Magnetosphere Astronomy and Astrophysics 01 natural sciences Computational physics Magnetic field Atmosphere Jupiter Dipole Space and Planetary Science Planet Physics::Space Physics 0103 physical sciences Hot Jupiter Astrophysics::Earth and Planetary Astrophysics 010303 astronomy & astrophysics Magnetic dipole |
| Zdroj: | Astronomy Reports. 64:259-271 |
| ISSN: | 1562-6881 1063-7729 |
| Popis: | 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-Alfven 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. |
| Databáze: | OpenAIRE |
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