Monitoring the radio emission of Proxima Centauri

We present results from the most comprehensive radio monitoring campaign towards closest star to our Sun, Proxima Centauri. report 1.1 3.1 GHz observations with Australian Telescope Compact Array over 18 consecutive days in April 2017. detect emission Centauri for of observing sessions, which spanned $\sim$1.6 orbital periods planet b. The is stronger at low-frequency band, centered around 1.6 GHz, and consistent expected electron-cyclotron frequency known star's magnetic field intensity about 600 Gauss. light curve shows an pattern that period b Proxima, its maxima happening near quadratures. also observed two short-duration (a few minutes) flares a long-duration (about three days) burst whose peaks happened close find frequency, large degree circular polarization, change sign are all expectations electron cyclotron-maser arising sub-Alfv\'enic star-planet interaction. interpret as signatures interaction between host Proxima. advocate other dwarf stars planets eventually reveal periodic due interaction, thus opening new avenue exoplanet hunting study exoplanet-star plasma