Detection of Exomoons Through Observation of Radio Emissions

Abstract

In the Jupiter-Io system, the moon's motion produces currents along the field lines that connect it to Jupiter's polar regions. The currents generate, and modulate radio emissions along their paths via the electron-cyclotron maser instability. Based on this process, we suggest that such modulation of planetary radio emissions may reveal the presence of exomoons around giant planets in exoplanetary systems. A model explaining the modulation mechanism in the Jupiter-Io system is extrapolated, and used to define criteria for exomoon detectability. A cautiously optimistic scenario of possible detection of such exomoons around Epsilon Eridani b, and Gliese 876 b is provided.Comment: 12 pages. 2 figures. Accepted for publication at AP