# Correcting the measured values of the rate of change of the spin and orbital periods of rotation powered pulsars

## TL;DR

This paper examines anomalies in measured spin and orbital period changes of pulsars, correcting for external effects using the GalDynPsr package to better understand their true physical behavior.

## Contribution

It introduces a method to correct pulsar period change measurements for external effects, clarifying the true signs of these changes.

## Key findings

- Some pulsars' period change signs are affected by external effects.
- Correcting for external influences can reveal the intrinsic period change signs.
- The study identifies potential reasons for measurement anomalies.

## Abstract

For rotation powered pulsars, the rate of change of the spin period is expected to be positive. On the other hand, for a clean binary system (where gravity is the only force acting on the pulsar) the rate of change of the orbital period is expected to be negative. There are, however, some pulsars with the measurements of the rate of change of the spin period as negative quantities. Likewise, there are some pulsars with positive measurements of the rate of change of the orbital period. We investigate these cases by eliminating the external dynamical effects. We also look at those cases where at first, the measured values possess the correct sign, but on subtracting the dynamical effects, the sign changes. We use `GalDynPsr' package to perform these tasks. Moreover, we investigate possible reasons for such anomalies.