Coherent Radio Emission from a Population of RS Canum Venaticorum Systems S
Astronomy & Astrophysics manuscript no. aanda ©ESO 2021 July 15, 2021 Coherent radio emission from a population of RS Canum Venaticorum systems S. E. B. Toet1;2, H. K. Vedantham2;3, J. R. Callingham1;2, K. C. Veken1;2, T. W. Shimwell1;2, P. Zarka4;5, H. J. A. Röttgering1, A. Drabent6, 1Leiden Observatory, Leiden University, PO Box 9513, 2300 RA, Leiden, The Netherlands 2ASTRON, the Netherlands Institute for Radio Astronomy, Oude Hoogeveensedijk 4,7991 PD Dwingeloo, The Netherlands 3Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700 AV Groningen, The Netherlands 4Station de Radioastronomie de Nançay, Observatoire de Paris, PSL Research University, CNRS, Université Orlèans, OSUC, 18330 Nançay, France 5LESIA, Observatoire de Paris, CNRS, PSL, Meudon, France 6Thüringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany ABSTRACT Coherent radio emission from stars can be used to constrain fundamental coronal plasma parameters, such as plasma density and magnetic field strength. It is also a probe of chromospheric and magnetospheric acceleration mechanisms. Close stellar binaries, such as RS Canum Venaticorum (RS CVn) systems, are particularly interesting as their heightened level of chromospheric activity and possible direct magnetic interaction make them a unique laboratory to study coronal and magnetospheric acceleration mechanisms. RS CVn binaries are known to be radio-bright but coherent radio emission has only conclusively been detected previously in one system. Here, we present a population of 14 coherent radio emitting RS CVn systems. We identified the population in the ongoing LOFAR Two Metre Sky Survey as circularly polarised sources at 144 MHz that are astrometrically associated with known RS CVn binaries.
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