Mass measurements of the double neutron star system PSR J0641+0448
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arXiv
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866908879132033024 |
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| author | Yang, Z. L. Han, J. L. Wang, P. F. Wang, C. Cai, N. N. Jing, W. C. Su, W. Q. Wang, T. Xu, J. Yan, Yi Zhou, D. J. |
| author_facet | Yang, Z. L. Han, J. L. Wang, P. F. Wang, C. Cai, N. N. Jing, W. C. Su, W. Q. Wang, T. Xu, J. Yan, Yi Zhou, D. J. |
| contents | Pulsar timing of double neutron star (DNS) systems is one of the best methodologies to study the neutron star masses distribution. Here we report the discovery of a double neutron star system PSR J0641+0448 in the Five-hundred-meter Aperture Spherical radio Telescope (FAST) Galactic Plane Pulsar Snapshot (GPPS) survey. This pulsar has a 25.7 ms spin period and moves in a 3.73-days eccentric orbit with an eccentricity of 0.145. Using FAST observations, we obtained its phase-connected timing solution with periastron advance and Shapiro delay detected. Using $χ^2$ analysis based on DDGR model, we constrain the pulsar mass to $1.319^{+0.021}_{-0.035}~M_\odot$, and the companion mass to $1.269^{+0.022}_{-0.016}~M_\odot$ with a 68.3\% confidence level. The low companion mass and mild orbital eccentricity is consistent with the correlation between neutron masses and orbital eccentricities. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_10788 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Mass measurements of the double neutron star system PSR J0641+0448 Yang, Z. L. Han, J. L. Wang, P. F. Wang, C. Cai, N. N. Jing, W. C. Su, W. Q. Wang, T. Xu, J. Yan, Yi Zhou, D. J. High Energy Astrophysical Phenomena Pulsar timing of double neutron star (DNS) systems is one of the best methodologies to study the neutron star masses distribution. Here we report the discovery of a double neutron star system PSR J0641+0448 in the Five-hundred-meter Aperture Spherical radio Telescope (FAST) Galactic Plane Pulsar Snapshot (GPPS) survey. This pulsar has a 25.7 ms spin period and moves in a 3.73-days eccentric orbit with an eccentricity of 0.145. Using FAST observations, we obtained its phase-connected timing solution with periastron advance and Shapiro delay detected. Using $χ^2$ analysis based on DDGR model, we constrain the pulsar mass to $1.319^{+0.021}_{-0.035}~M_\odot$, and the companion mass to $1.269^{+0.022}_{-0.016}~M_\odot$ with a 68.3\% confidence level. The low companion mass and mild orbital eccentricity is consistent with the correlation between neutron masses and orbital eccentricities. |
| title | Mass measurements of the double neutron star system PSR J0641+0448 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2603.10788 |