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

C Weber 1, 2 N. V. Erkaev 3, 4 V. A. Ivanov 4 P. Odert 5, 6 Jean-Mathias Grießmeier 7, 8 L. Fossati 1 H. Lammer 1 H. O. Rücker 6
1 IWF - Space Research Institute of Austrian Academy of Sciences
2 IAP - Institute of Atmospheric Physics [Prague]
3 ICM SB RAS - Institute of Computational Modelling of the Russian Academy of Sciences
4 SibFU - Siberian Federal University
5 IGAM - Institute for Geophysics, Astrophysics and Meteorology [Graz]
6 OeAW - Austrian Academy of Sciences
7 LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace
8 USN - Unité Scientifique de la Station de Nançay
Abstract : 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.
Keywords : radio continuum: planetary systems planet-star interactions planets and satellites: atmospheres planets and satellites: aurorae planets and satellites: detection planets and satellites: magnetic fields
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C Weber, N. V. Erkaev, V. A. Ivanov, P. Odert, Jean-Mathias Grießmeier, et al.. 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. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2018, 480 (3), pp.3680-3688. ⟨10.1093/mnras/sty2079⟩. ⟨insu-02177017⟩

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