AR Sco: A White Dwarf Synchronar

TL;DR

AR Sco is a binary system where a white dwarf's rapid magnetic synchronization, rather than accretion, drives emission, involving strong magnetic fields and magnetic reconnection in the M dwarf atmosphere.

Contribution

This paper introduces the concept of 'synchronars' and explains the emission mechanism of AR Sco through magnetic synchronization and reconnection, differing from typical accretion-powered systems.

Findings

White dwarf has a magnetic field of ~10^8 gauss.

Emission driven by magnetic reconnection, not accretion.

Displacement of optical maximum explained by magnetic interactions or precession.

Abstract

The emission of the white dwarf-M dwarf binary AR Sco is driven by the rapid synchronization of its white dwarf, rather than by accretion. This requires a comparatively large magnetic field $\sim 100$ gauss at the M dwarf and $\sim 10^8$ gauss on the white dwarf, larger than the fields of most intermediate polars but within the range of fields of known magnetic white dwarfs. The spindown power is dissipated in the atmosphere of the M dwarf by magnetic reconnection, accelerating particles that produce the observed synchrotron radiation. The displacement of the optical maximum from conjunction may be explained either by dissipation in a bow wave as the white dwarf's magnetic field sweeps past the M dwarf or by a misaligned white dwarf's rotation axis and oblique magnetic moment. In the latter case the rotation axis precesses with a period of decades, predicting a drift in the orbital phase of maximum. Binaries whose emission is powered by synchronization may be termed synchronars, in analogy to magnetars.