The FAST Galactic Plane Pulsar Snapshot survey: VIII. 116 binary pulsars

TL;DR

This paper reports the discovery and detailed analysis of 116 binary pulsars from the FAST Galactic Plane Pulsar Snapshot survey, providing new insights into neutron star systems, companion types, and gravity tests.

Contribution

It presents the Keplerian parameters for 116 new pulsars and timing solutions for 29, including measurements of post-Keplerian parameters for double neutron star systems, advancing pulsar astronomy.

Findings

Discovered 116 binary pulsars with diverse companions.

Measured post-Keplerian parameters for two double neutron star systems.

Identified optical counterparts and observed eclipses in multiple systems.

Abstract

Finding pulsars in binaries are important for measurements of the masses of neutron stars, for tests of gravity theories, and for studies of star evolution. We are carrying out the Galactic Plane Pulsar Snapshot survey (GPPS) by using the the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Here we present the Keplerian parameters for 116 newly discovered pulsars in the FAST GPPS survey, and obtain timing solutions for 29 pulsars. Companions of these pulsars are He white dwarfs, CO/ONe white dwarfs, neutron stars, main sequence stars and ultra light objects or even planets. Our observations uncover eclipses of 8 binary systems. The optical counterpart for the companion of PSR J1908+1036 is identified. The Post-Keplerian parameter $\dot{\omega}$ for the double neutron star systems PSR J0528+3529 and J1844-0128 have been measured, with which the total masses of the binary systems are determined.