Seven Pulsars in Binary Systems above the Spin-up Line

TL;DR

This paper analyzes 186 binary pulsars from the ATNF catalogue, focusing on seven that are unexpectedly above the spin-up line, and discusses potential reasons for this anomaly.

Contribution

It identifies and investigates seven binary pulsars above the spin-up line, providing possible explanations for this unusual positioning.

Findings

Seven binary pulsars are above the spin-up line.

Possible reasons include measurement errors or unique evolutionary histories.

The study enhances understanding of pulsar spin-up processes.

Abstract

Using data from the ATNF pulsar catalogue, 186 binary pulsars are shown in the magnetic field versus spin period (B-P) diagram, and their relationship to the spin-up line is investigated. Generally speaking, pulsars in binary systems should be below the spin-up line when they get enough accretion mass from their companions. It is found that there are seven binary pulsars above the spin-up line. Based on the parameters of these seven binary systems, we describe possible reasons why they are above the spin-up line.