Centrifugal breakout reconnection as the electron acceleration mechanism powering the radio magnetospheres of early-type stars

Magnetic B-stars often exhibit circularly polarized radio emission thought to arise from gyrosynchrotron by energetic electrons trapped in the circumstellar magnetosphere. Recent empirical analyses show that onset and strength of observed scale with both magnetic field stellar rotation rate. This challenges existing paradigm are accelerated current sheet between opposite-polarity lines outer regions magnetised winds, which includes no role for rotation. Building on recent success explaining a similar rotation-field dependence H$\alpha$ line terms model magnetospheric density is regulated centrifugal breakout (CBO), we examine here potential associated CBO-driven reconnection accelerating emit radio. We particular theoretical scalings energy production CBO match well trends luminosity, suitably small, nearly constant conversion efficiency $\epsilon \approx 10^{-8}$. summarize distinct advantages our over previous associations an electromotive force, discuss implications processes X-rays other characteristics rotating magnetospheres.