PSR J1953+1844 probably being the descendant of an Ultra-compact X-ray binary

Abstract

PSR J1953+1844 (i.e., M71E) is a millisecond pulsar (MSP)in a 53 minute binary orbit discovered by the Five-hundred-meter Aperture Spherical radio Telescope. The mass function from pulsar timing is $2.3\times 10^{-7}$ $M_{\odot }$. The possible redback origin of this system has been discussed by Pan et al. We discuss here an alternative evolution track for this binary system, namely that PSR J1953+1844 is a descendant of an ultra-compact X-ray binary (UCXB), which has a hydrogen-poor donor accreting onto a neutron star (NS) with an orbital period of $\le 1$ hr. We noticed that some of UCXB systems hold an accreting millisecond X-ray pulsars (AMXPs) and a donor with a mass of about 0.01 M${}_{\odot }$. M71E has a very similar orbit to those of AMXPs, indicating that it might be evolved from a UCXB similar to PSR J1653--0158. The companion star of M71E should be significantly bloated and it most probably has a carbon and oxygen composition, otherwise a low inclination angle of the orbit is required for a helium companion. The discovery of this M71E binary system may shed light on when and how an NS in a UCXBs turns into a radio pulsar.

Accepted for publication in ApJL. 5 pages, 2 figures

References in corpus (15)

• The Five-Hundred-Meter Aperture Spherical Radio Telescope (FAST) Project
• A Radio Pulsar/X-ray Binary Link
• The FAST Galactic Plane Pulsar Snapshot survey: I. Project design and pulsar discoveries
• Six new candidate ultracompact X-ray binaries
• Evolution of Low-Mass Helium Stars in Semidetached Binaries
• FAST Globular Cluster Pulsar Survey: Twenty-Four Pulsars Discovered in Fifteen Globular Clusters
• Discovery of a Gamma-ray Black Widow Pulsar by GPU-accelerated Einstein@Home
• Gamma-ray Timing of Redback PSR J2339-0533: Hints for Gravitational Quadrupole Moment Changes
• Ultra-compact X-ray binaries with He star companions
• Novel modelling of ultra-compact X-ray binary evolution - stable mass transfer from white dwarfs to neutron stars
• Formation of the planet around the millisecond pulsar J1719-1438
• An Optical Study of the Black Widow Population
• NICER Discovery of Millisecond X-ray Pulsations and an Ultracompact Orbit in IGR J17494-3030
• Formation of black widows through ultra-compact X-ray binaries with He star companions
• Decade Long Timing Study of the Black Widow Millisecond Pulsar J1544+4937

Cited by in corpus (5)

• The FAST Galactic Plane Pulsar Snapshot survey: VI. The discovery of 473 new pulsars
• The FAST Galactic Plane Pulsar Snapshot survey: VIII. 116 binary pulsars
• The FAST Globular Cluster Pulsar Survey (GC FANS)
• Illuminating Hidden Pulsars: Scintillation-Enhanced Discovery of Two Binary Millisecond Pulsars in M13 with FAST
• Ultra-compact X-ray Binaries: A Review