# Understanding recent observations of isolated magnetars and accreting magnetars from the magnetospheric point of view

## TL;DR

This paper discusses the wind braking model for magnetars, explaining recent observations and predicting phenomena like wind nebulae and low braking indices, while also exploring accreting magnetars in binary systems.

## Contribution

It applies the wind braking model to recent magnetar observations and extends the discussion to accreting magnetars and their observational signatures.

## Key findings

- Decreasing torque during outbursts explained by wind braking
- Predicted existence of magnetism-powered wind nebulae
- Ultra-luminous X-ray pulsars may be accreting magnetars

## Abstract

The wind braking model and its applications of magnetars are discussed. The decreasing torque of magnetars during outbursts, anti-glitch, and anti-correlations between radiation and timing are understandable in the wind braking model. Recent timing observations of magnetars are also consistent with the previous modeling. A magnetism-powered wind nebula and a braking index smaller than three are the two predictions. Besides isolated magnetars, there may also be accreting magnetars in binary systems and magnetars accreting from fallback disks. Observationally, ultra-luminous X-ray pulsars may be accreting magnetars, while super-slow magnetars may be magnetars with fallback disks in the past. Many works are needed for both isolated magnetars and accreting magnetars.