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

@misc{wang2026massive,
  title = {{A Massive and Eccentric Binary Millisecond Pulsar in the Globular Cluster M10}},
  author = {Yujie Wang and Zhongli Zhang and Zhichen Pan and Lei Qian and Lijing Shao and Dejiang Yin and Yujie Lian},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.02397},
  eprint = {2611.02397},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.02397},
}

TY  - UNPB
TI  - A Massive and Eccentric Binary Millisecond Pulsar in the Globular Cluster M10
AU  - Yujie Wang
AU  - Zhongli Zhang
AU  - Zhichen Pan
AU  - Lei Qian
AU  - Lijing Shao
AU  - Dejiang Yin
AU  - Yujie Lian
PY  - 2026
DA  - 2026/11/02
PB  - arXiv
DO  - 10.48550/arxiv.2611.02397
UR  - https://arxiv.org/abs/2611.02397
AB  - 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 ∼ 37 days) and eccentric (e ∼ 0.12) orbit. We also measured the periastron advance ω̇ = 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.
ER  -