Supermassive hot Jupiters provide more favourable conditions for the generation of radio emission via the cyclotron maser instability - a case study based on Tau Bootis b
Erkaev, N. V.
Ivanov, V. A.
Rucker, H. O.
Кафедра прикладной механики
Journal Name:Monthly Notices of the Royal Astronomical Society
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q1
Bibliographic Citation:Weber, C. Supermassive hot Jupiters provide more favourable conditions for the generation of radio emission via the cyclotron maser instability - a case study based on Tau Bootis b [Текст] / C. Weber, N. V. Erkaev, V. A. Ivanov, P. Odert, Grießmeier J.-M., L. Fossati, H. Lammer, H. O. Rucker // Monthly Notices of the Royal Astronomical Society. — 2018. — Т. 480 (№ 3). — С. 3680-3688
We investigate under which conditions supermassive hot Jupiters can sustain source regions for radio emission, and whether this emission could propagate to an observer outside the system. We study Tau Bootis b-like planets (a supermassive hot Jupiter with 5.84 Jupiter masses and 1.06 Jupiter radii), but located at different orbital distances (between its actual orbit of 0.046 and 0.2 au). Due to the strong gravity of such planets and efficient radiative cooling, the upper atmosphere is (almost) hydrostatic and the exobase remains very close to the planet, which makes it a good candidate for radio observations. We expect similar conditions as for Jupiter, i.e. a region between the exobase and the magnetopause that is filled with a depleted plasma density compared with cases where the whole magnetosphere cavity is filled with hydrodynamically outward flowing ionospheric plasma. Thus, unlike classical hot Jupiters like the previously studied planets HD 209458b and HD 189733b, supermassive hot Jupiters should be in general better targets for radio observations.
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