[P-AE18] Exoplanets

[PAE18-09] Methods and results of low-frequency beamformed exoplanet detection studies
with NenuFAR

*Corentin Kenelm Louis^1,2, Philippe Zarka^1,2, Alan Loh^1,2, Emilie Mauduit^1,2, Julien Girard^1,2, Laurent Lamy, Jean-Mathias Griessmeier (1.LIRA, Observatoire de Paris, CNRS, PSL, 2.ORN, Observatoire de paris, CNRS, Universite d'Orleans)

Keywords:Exoplanets, Radio Emissions, NenuFAR Radiotelescope, Methods

The Electron Cyclotron Maser (ECM) is the well-accepted paradigm for the auroral radio emissions from magnetized Solar System planets. The emitted frequencies are local electron cyclotron frequencies, directly related to planetary magnetic field strength. Detecting ECM radio emissions from exoplanets is thus the key for measuring exoplanetary magnetic fields (inaccessible via Zeeman Doppler measurements), with implications on internal structure, habitability, compared magnetosphere population and exo-space weather studies. Planetary radio emissions are expected at low frequencies, typically below 100 MHz. In the frame of the corresponding large program running at the NenuFAR radio array in France, we have developed several methods for enhancing detection capabilities, based on radio periodicities, drifting fine structures and linearly polarized emission. We have tested them on Jupiter, our closest exoplanetary radio analog. We will present the methods, test results, and first application to long series of beamformed observations.