Models of the non-thermal emission from early-type binaries

TL;DR

This paper reviews the hydrodynamics and observational evidence of non-thermal emission from wind-wind collisions in massive star binaries, highlighting recent gamma-ray detections and discussing current models and future directions.

Contribution

It provides a comprehensive summary of the current understanding and modeling of non-thermal emission in early-type binary systems, including recent observational breakthroughs.

Findings

Detection of gamma-ray emission from early-type binaries

Hydrodynamic models explain wind-wind collision regions

Non-thermal emission mechanisms are increasingly well-understood

Abstract

The powerful wind-wind collision in massive star binaries creates a region of high temperature plasma and accelerates particles to relativistic energies. I briefly summarize the hydrodynamics of the wind-wind interaction and the observational evidence, including recent $\gamma$-ray detections, of non-thermal emission from such systems. I then discuss existing models of the non-thermal emission and their application to date, before concluding with some future prospects.