PSR J0952-0607: Tightening a Record-High Neutron Star Mass
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866915654308724736 |
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| author | Romani, Roger W. Beleznay, Maya Filippenko, Alexei V. Brink, Thomas G. Zheng, WeiKang |
| author_facet | Romani, Roger W. Beleznay, Maya Filippenko, Alexei V. Brink, Thomas G. Zheng, WeiKang |
| contents | We report on new orbit-minimum photometry and revised radial-velocity fitting that provide an improved measurement of the mass of the neutron star (NS) in pulsar PSR~J0952$-$0607 at $M_NS = 2.35\pm 0.11 M_\odot$. With its fast spin and unusually low magnetic field, this NS has evidently experienced unusual evolution, likely connected with its high mass, which is now $2.5σ$ above that of the heaviest pulsar with a white dwarf companion, as measured by Shapiro delay techniques. By tightening the mass measurement, we also raise the maximum (commonly called Tolman-Oppenheimer-Volkoff) NS mass to $M_{\rm TOV} > 2.27\,M_\odot$$(2.12\,M_\odot)$ at $1σ$$(3σ)$ confidence, which improves bounds on the dense-matter equation of state. While the statistical error decreases and systematic issues should be modest, uncertainties remain; we comment briefly on these factors and prospects for further improvement. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_05099 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | PSR J0952-0607: Tightening a Record-High Neutron Star Mass Romani, Roger W. Beleznay, Maya Filippenko, Alexei V. Brink, Thomas G. Zheng, WeiKang High Energy Astrophysical Phenomena We report on new orbit-minimum photometry and revised radial-velocity fitting that provide an improved measurement of the mass of the neutron star (NS) in pulsar PSR~J0952$-$0607 at $M_NS = 2.35\pm 0.11 M_\odot$. With its fast spin and unusually low magnetic field, this NS has evidently experienced unusual evolution, likely connected with its high mass, which is now $2.5σ$ above that of the heaviest pulsar with a white dwarf companion, as measured by Shapiro delay techniques. By tightening the mass measurement, we also raise the maximum (commonly called Tolman-Oppenheimer-Volkoff) NS mass to $M_{\rm TOV} > 2.27\,M_\odot$$(2.12\,M_\odot)$ at $1σ$$(3σ)$ confidence, which improves bounds on the dense-matter equation of state. While the statistical error decreases and systematic issues should be modest, uncertainties remain; we comment briefly on these factors and prospects for further improvement. |
| title | PSR J0952-0607: Tightening a Record-High Neutron Star Mass |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2512.05099 |