PSR J1231-1411 revisited: Pulse Profile Analysis of X-ray Observation
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| Autores principales: | , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
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2025
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| author | Qi, Liqiang Zheng, Shijie Zhang, Juan Ge, Mingyu Li, Ang Zhang, Shuang-Nan Lu, Fang-Jun Peng, Han-Long Zhang, Liang Feng, Hua Zhang, Zhen Xu, Yupeng Li, Zheng-Wei Song, Li-Ming Zhang, Shu Tao, Lian Ye, Wentao |
| author_facet | Qi, Liqiang Zheng, Shijie Zhang, Juan Ge, Mingyu Li, Ang Zhang, Shuang-Nan Lu, Fang-Jun Peng, Han-Long Zhang, Liang Feng, Hua Zhang, Zhen Xu, Yupeng Li, Zheng-Wei Song, Li-Ming Zhang, Shu Tao, Lian Ye, Wentao |
| contents | One of the primary goals of Neutron Star Interior Composition Explorer (NICER)-like X-ray missions is to impose stringent constraints on the neutron star equation of state by precisely measuring their masses and radii. NICER has recently expanded the dataset of inferred mass-radius relations for neutron stars, including four rotation-powered millisecond pulsars PSR J0030+0451, PSR J0740+6620, PSR J0437-4715, and PSR J1231-1411. In this work, the mass-radius relation and X-ray emitting region properties of PSR J1231-1411 are inferred with an independent pulse profile modeling based on the spherical star Schwarzschild-spacetime and Doppler approximation. With one single-temperature elongated hot spot and one single-temperature crescent hot spot, the inferred gravitational mass is $M = 1.12 \pm 0.07 M_{\odot}$ and the inferred equatorial radius is $R_{eq} = 9.91_{-0.86}^{+0.88}$ km (68% credible intervals). It provides an alternative geometry configuration of the X-ray emitting region for PSR J1231-1411 to sufficiently explain the observation data of NICER and XMM-Newton. The inferred radius is smaller than that derived by \citet{salmi2024nicer} ($M = 1.04_{-0.03}^{+0.05} M_{\odot}$, $R_{eq} = 12.6 \pm 0.3$ km), and the inferred mass is slightly higher in this work. The inferred geometry configurations of the X-ray emitting region in both works are non-antipodal, which is not consistent with a centered dipole magnetic field and suggests a complex magnetic field structure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_09147 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | PSR J1231-1411 revisited: Pulse Profile Analysis of X-ray Observation Qi, Liqiang Zheng, Shijie Zhang, Juan Ge, Mingyu Li, Ang Zhang, Shuang-Nan Lu, Fang-Jun Peng, Han-Long Zhang, Liang Feng, Hua Zhang, Zhen Xu, Yupeng Li, Zheng-Wei Song, Li-Ming Zhang, Shu Tao, Lian Ye, Wentao High Energy Astrophysical Phenomena Nuclear Theory One of the primary goals of Neutron Star Interior Composition Explorer (NICER)-like X-ray missions is to impose stringent constraints on the neutron star equation of state by precisely measuring their masses and radii. NICER has recently expanded the dataset of inferred mass-radius relations for neutron stars, including four rotation-powered millisecond pulsars PSR J0030+0451, PSR J0740+6620, PSR J0437-4715, and PSR J1231-1411. In this work, the mass-radius relation and X-ray emitting region properties of PSR J1231-1411 are inferred with an independent pulse profile modeling based on the spherical star Schwarzschild-spacetime and Doppler approximation. With one single-temperature elongated hot spot and one single-temperature crescent hot spot, the inferred gravitational mass is $M = 1.12 \pm 0.07 M_{\odot}$ and the inferred equatorial radius is $R_{eq} = 9.91_{-0.86}^{+0.88}$ km (68% credible intervals). It provides an alternative geometry configuration of the X-ray emitting region for PSR J1231-1411 to sufficiently explain the observation data of NICER and XMM-Newton. The inferred radius is smaller than that derived by \citet{salmi2024nicer} ($M = 1.04_{-0.03}^{+0.05} M_{\odot}$, $R_{eq} = 12.6 \pm 0.3$ km), and the inferred mass is slightly higher in this work. The inferred geometry configurations of the X-ray emitting region in both works are non-antipodal, which is not consistent with a centered dipole magnetic field and suggests a complex magnetic field structure. |
| title | PSR J1231-1411 revisited: Pulse Profile Analysis of X-ray Observation |
| topic | High Energy Astrophysical Phenomena Nuclear Theory |
| url | https://arxiv.org/abs/2502.09147 |