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<p>We report the discovery and characterization of PSR J1810–0623, a fully recycled millisecond pulsar with a spin period of 4.55 ms, discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) and followed up with FAST and the Green Bank Telescope (GBT). A phase-connected timing solution spanning over 6.5 years reveals a 15.4-day binary orbit with extremely low eccentricity (<i>e</i> ≃ 1.5 × 10<sup>−5</sup>). Assuming a neutron-star mass of 1.4 <i>M</i><sub>⊙</sub>, the inferred companion median mass (∼0.64 <i>M</i><sub>⊙</sub>) is consistent with a carbon-oxygen white dwarf, indicating an evolutionary origin in an intermediate-mass X-ray binary. The system’s properties closely resemble those of other massive white dwarf binaries thought to form via Case A Roche lobe overflow, suggesting a prolonged accretion phase during which the neutron star was efficiently recycled. Polarimetric analysis of FAST data yields a moderate degree of linear polarization and a rotation measure of (86.6 ± 0.6)rad m<sup>−2</sup>, offering constraints on the Galactic magnetic field. The inferred characteristic age (∼32 Gyr) and low surface magnetic field (∼10<sup>8</sup> G) indicate a highly recycled pulsar. Proper-motion measurements imply a modest transverse velocity, consistent with those of recycled millisecond pulsars in the Galactic field. Although the proximity of the globular cluster Pal 7 raises the possibility of a dynamical origin, discrepancies in dispersion measure and proper motion argue against a physical association. PSR J1810–0623 adds to the rare class of long-orbital period MSP-CO WD systems and provides a valuable laboratory for studying pulsar recycling, binary evolution, and Galactic structure.</p>

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Discovery of a millisecond pulsar with a CO white dwarf companion

  • 期刊论文

  • 发表日期：

    2026年5月20日

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  • Jie Zhang,
  • Ze-Rui Wang,
  • Lei Zhang,
  • Yulan Liu,
  • Alessandro Ridolfi,
  • Meng Guo,
  • Di Li,
  • Ryan S. Lynch,
  • Cong Wang,
  • Pei Wang,
  • Mengmeng Ni,
  • Jiale Hu,
  • Mengquan Liu,
  • Zhie Liu,
  • Bo Han,
  • Chenchen Miao

摘要

We report the discovery and characterization of PSR J1810–0623, a fully recycled millisecond pulsar with a spin period of 4.55 ms, discovered with the Five-hundred-meter Aperture Spherical radio Telescope (FAST) and followed up with FAST and the Green Bank Telescope (GBT). A phase-connected timing solution spanning over 6.5 years reveals a 15.4-day binary orbit with extremely low eccentricity (e ≃ 1.5 × 10−5). Assuming a neutron-star mass of 1.4 M⊙, the inferred companion median mass (∼0.64 M⊙) is consistent with a carbon-oxygen white dwarf, indicating an evolutionary origin in an intermediate-mass X-ray binary. The system’s properties closely resemble those of other massive white dwarf binaries thought to form via Case A Roche lobe overflow, suggesting a prolonged accretion phase during which the neutron star was efficiently recycled. Polarimetric analysis of FAST data yields a moderate degree of linear polarization and a rotation measure of (86.6 ± 0.6)rad m−2, offering constraints on the Galactic magnetic field. The inferred characteristic age (∼32 Gyr) and low surface magnetic field (∼108 G) indicate a highly recycled pulsar. Proper-motion measurements imply a modest transverse velocity, consistent with those of recycled millisecond pulsars in the Galactic field. Although the proximity of the globular cluster Pal 7 raises the possibility of a dynamical origin, discrepancies in dispersion measure and proper motion argue against a physical association. PSR J1810–0623 adds to the rare class of long-orbital period MSP-CO WD systems and provides a valuable laboratory for studying pulsar recycling, binary evolution, and Galactic structure.