Magneto-rotational evolution of neutron stars with hysteresis effect and fallback

TL;DR

This paper investigates the magneto-rotational evolution of young neutron stars with fallback accretion, explaining how they can bypass the Ejector stage due to hysteresis effects, which accounts for recent observations of young X-ray binary systems.

Contribution

It introduces a model considering hysteresis in the transition between Ejector and Propeller stages, explaining young neutron stars' evolution that deviates from standard theory.

Findings

Young neutron stars can skip the Ejector stage due to initial conditions.

Hysteresis effects influence the transition between accretion stages.

The model aligns with recent observations of young X-ray binaries.

Abstract

In recent years, accreting neutron stars (NSs) in X-ray binary systems in supernova remnants have been discovered. They are a puzzle for the standard magneto-rotational evolution of NSs, as their age ($\lesssim 10^5$ years) is much less than expected duration of the preceding Ejector and Propeller stages. To explain such systems, we consider rotational evolution of NSs with fallback accretion and asymmetry in direct/backward transitions between Ejector and Propeller stages. It is shown that at certain values of the initial period and the magnetic field, a young neutron star may not enter the Ejector stage during its evolution.