Published February 25, 2021 | Version v1
Poster Open

Planet-induced radio emission from the coronae of M dwarfs

  • 1. Trinity College Dublin
  • 2. University of Oxford
  • 3. University of St Andrews
  • 4. Université de Toulouse
  • 5. National University of Ireland, Galway




There have recently been detections of radio emission from low-mass stars, some of which are indicative of star-planet interactions. Motivated by these exciting new results, here we present stellar wind models for the active planet-hosting M dwarf AU Mic. Our models incorporate the large-scale photospheric magnetic field map of the star, reconstructed using the Zeeman-Doppler Imaging method. We use our models to assess if planet-induced radio emission could be generated in the corona of AU Mic, through a mechanism analogous to the sub-Alfvénic Jupiter-Io interaction. In the case that AU Mic has a mass-loss rate of < 590 times that of the Sun, we find that both planets b and c in the system can induce radio emission from 10 MHz – 3 GHz in the corona of the host star for the majority of their orbits, with peak flux densities of 10 mJy. Our predicted emission bears a striking similarity to that recently reported from GJ 1151 by Vedantham et al. (2020), which is indicative of being induced by a planet.



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  • van der Holst, Bart et al. (2014). Alfvén Wave Solar Model (AWSoM): Coronal Heating.
  • Klein, Baptiste et al. (2021b). Investigating the young AU Mic system with SPIRou: large-scale stellar magnetic field and close-in planet mass.
  • Turnpenney, Sam et al. (2018). Exoplanet-induced Radio Emission from M Dwarfs.
  • Vedantham, Harish et al (2020). Coherent radio emission from a quiescent red dwarf indicative of star-planet interaction.