Search for binary companions around millisecond pulsars

TL;DR

This paper investigates the presence of binary companions around millisecond pulsars to better understand their formation and evolution, using timing data to identify potential binary systems and guide future observations.

Contribution

It presents a systematic exercise to identify probable binary companions of MSPs in the Galactic field, aiming to improve detection methods and understanding of MSP binary evolution.

Findings

Identification of candidate MSPs with potential binary companions

Potential discovery of optical emission from MSPs

Guidance for future pulsar timing campaigns

Abstract

It is believed that the radio pulsars rotating at spin periods of about 30 millisecond or even lower got such high spins through the transfer of angular momentum by accreting matter from their binary companions (or past companions) in the past. Around 35% of MSPs are known to be isolated, some of the which might actually be in binaries - either not timed very well to obtain the signature of the orbit or in extremely wide binaries that can be revealed only through very accurate timing, as in the case of PSR J1024-0719. This has motivated an exercise to identify probable candidates of companions of MSPs in the Galactic field. This exercise has even the potential of discovering optical emission from MSPs themselves. Discovery of any possible binary companion will be followed by motivated pulsar timing campaigns to confirm the binary nature and to constrain orbital parameters.