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arXiv · 2611.02397

A Massive and Eccentric Binary Millisecond Pulsar in the Globular Cluster M10

Yujie Wang·Zhongli Zhang·Zhichen Pan·Lei Qian·Lijing Shao·Dejiang Yin·Yujie Lian
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Abstract

We present the timing solution of the millisecond pulsar PSR J1657-0406A in the globular cluster M10, based on observations performed with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The timing results show that PSR J1657-0406A is in a long-period ($P_b \sim 37$ days) and eccentric ($e \sim 0.12$) orbit. We also measured the periastron advance $\dotω = 0.00090(13)$ degrees per year, which implies a total system mass of $2.5(6)$ solar masses, assuming that general relativity accurately models the orbital motion. No optical counterpart was detected within the positional uncertainty, indicating that the companion is unlikely to be a main-sequence star. Considering possible formation channels for the orbital eccentricity, we favor a helium white dwarf companion, although a massive white dwarf or neutron star cannot be completely excluded.

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Yujie Wang, Zhongli Zhang, Zhichen Pan, Lei Qian, Lijing Shao, Dejiang Yin, Yujie Lian. 2026-11-02. A Massive and Eccentric Binary Millisecond Pulsar in the Globular Cluster M10. https://doi.org/10.3847/1538-4357%2Faea6af

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