Decade-long timing of four GMRT discovered millisecond pulsars

TL;DR

This paper presents a decade-long timing analysis of four millisecond pulsars discovered by GMRT, highlighting improvements post-upgrade and their potential for gravitational wave detection in Pulsar Timing Arrays.

Contribution

It provides detailed timing measurements, proper motions, and assesses the impact of the GMRT upgrade on pulsar timing precision, aiding gravitational wave research.

Findings

Timing precision improved after GMRT upgrade

Proper motions of the pulsars were measured

Decade-long data enhances PTA gravitational wave detection efforts

Abstract

The discovery and timing follow-up of millisecond pulsars (MSPs) are necessary not just for their usefulness in Pulsar Timing Arrays (PTAs) but also for investigating their own intriguing properties. In this work, we provide the findings of the decade-long timing of the four MSPs discovered by the Giant Metre-wave Radio Telescope (GMRT), including their timing precision, model parameters, and newly detected proper motions. We compare the timing results for these MSPs before and after the GMRT upgrade in 2017, characterise the improvement in timing precision due to the bandwidth upgrade. We discuss the suitability of these four GMRT MSPs as well as the usefulness of their decade-long timing data for the PTA {experiments. It may aid} in the global effort to improve the signal-to-noise (S/N) of recently detected signature of gravitational waves in cross-correlation statistics of residuals of MSPs.