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Lightning induced radio emission has been observed on solar system planets.Lecavelier des Etangs et al. [2013] carried out radio transit observations ofthe exoplanet HAT-P-11b, and suggested a tentative detection of a radio signal.Here, we explore the possibility of the radio emission having been produced bylightning activity on the exoplanet, following and expanding the work ofHodos\'an et al. [2016a]. After a summary of our previous work [Hodos\'an etal. 2016a], we extend it with a parameter study. The lightning activity of thehypothetical storm is largely dependent on the radio spectral roll-off, $n$,and the flash duration, $\tau_\mathrm{fl}$. The best-case scenario wouldrequire a flash density of the same order of magnitude as can be found duringvolcanic eruptions on Earth. On average, $3.8 \times 10^6$ times larger flashdensities than the Earth-storms with the largest lightning activity is neededto produce the observed signal from HAT-P-11b. Combined with the results ofHodos\'an et al. [2016a] regarding the chemical effects of planet-widethunderstorms, we conclude that future radio and infrared observations may leadto lightning detection on planets outside the solar system.

Exo-lightning radio emission: the case study of HAT-P-11b