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We investigate under which conditions supermassive hot Jupiters can sustainsource regions for radio emission, and whether this emission could propagate toan observer outside the system. We study Tau Bootis b-like planets (asupermassive hot Jupiter with 5.84 Jupiter masses and 1.06 Jupiter radii), butlocated at different orbital distances (between its actual orbit of 0.046 AUand 0.2 AU). Due to the strong gravity of such planets and efficient radiativecooling, the upper atmosphere is (almost) hydrostatic and the exobase remainsvery close to the planet, which makes it a good candidate for radioobservations. We expect similar conditions as for Jupiter, i.e. a regionbetween the exobase and the magnetopause that is filled with a depleted plasmadensity compared with cases where the whole magnetosphere cavity is filled withhydrodynamically outward flowing ionospheric plasma. Thus, unlike classical hotJupiters like the previously studied planets HD 209458b and HD 189733b,supermassive hot Jupiters should be in general better targets for radioobservations.

monthly notices of the royal astronomical society

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