Future ground-based radio telescopes are expected to be capable of detecting radio signals from an extrasolar gas giant. The radio emission from a gas giant is related to interactions between high-energy, charged particles, especially, electrons, and a planetary magnetic field. The planetary magnetic field can be generated and maintained by a dynamo in an electrically-conducting fluid inside a planet, e.g., the metallic hydrogen region in a gas giant. This study has investigated the relationship between the magnetic field strength of an extrasolar gas giant and its elusive interior structure. The strength of a magnetic field is insensitive to the interior structure, specifically, the inner core, for a hot Jupiter, whereas the emergence of the magnetic field and its strength inside a hot Saturn are closely related to the existence of an inner core. This research was published in the Astrophysical Journal on Feb.26, 2021.
Journal：The Astrophysical Journal
Title：The Linkage between the Core Mass and the Magnetic Field of an Extrasolar Giant Planet from Future Radio Observations
Auther : Yasunori Hori (Astrobiology Center / National Astronomical Observatory of Japan)