Coherent radio emission from a population of RS Canum Venaticorum systems

Coherent radio emission from stars can be used to constrain fundamental coronal plasma parameters, such as density and magnetic field strength. It is also a probe of chromospheric magnetospheric acceleration mechanisms. Close stellar binaries, RS Canum Venaticorum (RS CVn) systems, are particularly interesting their heightened level activity possible direct interaction make them unique laboratory study CVn binaries known radio-bright but coherent has only conclusively been detected previously in one system. Here, we present population 14 emitting systems. We identified the ongoing LOFAR Two Metre Sky Survey circularly polarised sources at 144MHz that astrometrically associated with binaries. show observed powered by electron cyclotron maser instability. use numerical calculations maser's beaming geometry argue commonly invoked 'loss-cone' cannot generate necessary brightness temperature some our detections more efficient instability, shell or horseshoe maser, must invoked. Such configurations operate planetary magnetospheres. outline two mechanisms could produce emission, where occurs chromosphere due an electrodynamic between stars. propose optical monitoring observations differentiate these