ABSTRACT
Jupiter's radio emissions have been intensively studied since their discovery some 70 years ago. Space missions have extended these studies to radio emissions from all planetary magnetospheres in the solar system. Main emission characteristics have been determined (source location, directivity, power, polarization, etc.) and their microscopic generation process elucidated (primarily the electron Cyclotron Maser instability). The 3 magnetospheric engines of these emissions are now well documented (solar wind-magnetosphere, magnetosphere-ionosphere, and satellite-planet interactions). We can thus try to extrapolate our solar system-based knowledge to star-exoplanet systems, and attempt to detect radio emissions from these systems. I will give an overview of the theoretical framework and observational results to date, with prospects for the coming years. Motivations for these studies include direct exoplanetary magnetic field measurement, planetary protection, compared magnetospheric physics and exo-space weather.
BIO
Philippe Zarka, born in 1961, is senior Research Scientist (Directeur de Recherche) at CNRS, and works at LESIA laboratory of Observatoire de Paris. He obtained his PhD in astrophysics in 1984 (Paris University). His main interests are low-frequency Radioastronomy (ground- & space-based) and plasma physics applied to planetary and exoplanetary physics (ionospheres, magnetospheres, theory and detection of radio emissions), and also the Sun, Pulsars and Fast radio Bursts. He is or was co-Investigator on many space missions (Voyager, Ulysses, Cassini, Juno…), and principal Investigator of the Nançay Decameter Array (in the 1990’s) and today of the new giant french low-frequency radiotelescope NenuFAR. He obtained in 2021 an ERC advanced grant for the radio detection and study of exoplanets. He is deputy-Director of the Nançay Radio Observatory (ORN).
Host: Di Li
