Can radio emission escape from the magnetosphere of ? Andromedae b – a new method to constrain the minimum mass of Hot Jupiters

ABSTRACT We investigate the atmospheric and magnetospheric conditions of massive, close-in exoplanet ? Andromedae b (hereafter ups And b). In particular, we explore whether radio emission can be produced by Cyclotron Maser Instability (CMI), this escape from its source region. For this, compare local cyclotron frequency to plasma frequency. The planetary mass has a decisive impact on both these frequencies: depends (mass-dependent) estimate magnetic moment, is determined (gravity-dependent) profile. reason, one parameters determining CMI operate efficiently. As precise unknown in case b, for range hypothetical masses planet order determine at which atmosphere becomes ‘compact’, i.e. not strongly extended, thus provides favourable CMI. detected emission, approach provide new way constrain an only minimum known.