Possible New Envelope Types of Hot Jupiters
| Autor: | D. V. Bisikalo, Andrey Zhilkin |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
010308 nuclear & particles physics Magnetosphere Lagrangian point Astronomy and Astrophysics Astrophysics 01 natural sciences Magnetic field Jupiter Space and Planetary Science Planet Physics::Space Physics 0103 physical sciences Hot Jupiter Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Ionosphere 010303 astronomy & astrophysics Envelope (waves) |
| Zdroj: | Astronomy Reports. 64:563-577 |
| ISSN: | 1562-6881 1063-7729 |
| DOI: | 10.1134/s1063772920080090 |
| Popis: | —For the case of the sub-Alfven regime of the stellar wind flyby around the planet, the flow structure in the vicinity of a hot Jupiter have been studied by three-dimensional numerical simulation. As an example, the hot Jupiter HD 209458b was considered. The planet’s magnetic moment was set equal to 10% of the magnetic moment of Jupiter. The average magnetic field at the parent star’s surface was taken to be 0.5 G, corresponding to a relatively strong wind field. Under such conditions, calculations have shown that a quasi-closed ionospheric (gas) envelope with an induced shockless magnetosphere forms around a hot Jupiter. Under the influence of the strong magnetic field of stellar wind, envelope matter outflowing from the inner Lagrange point does not move along the ballistic trajectory, but rather moves along magnetic field lines of the wind toward the star. Therefore, for the sub-Alfven flow regime, a new ionospheric envelope type of hot Jupiters is considered to be discovered, supplementing the classification suggested earlier based on results of purely gas-dynamic modeling. Possible distinctive features of the observational manifestations of such envelopes are discussed. |
| Databáze: | OpenAIRE |
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