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arXiv 2403.17828astro-ph.HE
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致密双中子星系统 PSR J1946+2052 中的相对论性自旋进动

The Relativistic Spin Precession in the Compact Double Neutron Star System PSR~J1946+2052

Lingqi Meng, Weiwei Zhu, Michael Kramer, Xueli Miao, Gregory Desvignes, Lijing Shao, Huanchen Hu, Paulo C. C. Freire, Yongkun Zhang, Mengyao Xue, Ziyao Fang, Da… 展开作者

Lingqi Meng, Weiwei Zhu, Michael Kramer, Xueli Miao, Gregory Desvignes, Lijing Shao, Huanchen Hu, Paulo C. C. Freire, Yongkun Zhang, Mengyao Xue, Ziyao Fang, David J. Champion, Mao Yuan, Chenchen Miao, Jiarui Niu, Qiuyang Fu, Jumei Yao, Yanjun Guo, Chengmin Zhang

AI总结:

本文利用 FAST 观测发现 PSR J1946+2052 的脉冲轮廓变化源于相对论性自旋进动,并通过偏振建模约束其轨道倾角与自旋几何,提出未来可结合脉冲星计时检验广义相对论。

摘要:

我们利用五百米口径球面射电望远镜(FAST)的观测,在致密双中子星系统 PSR J1946+2052 的可见脉冲星中观测到系统的脉冲轮廓变化。从 2018 年到 2021 年,PSR J1946+2052 的中间脉冲由单峰形状变为双峰形状。我们将这一演化归因于该脉冲星的相对论性自旋进动。借助 FAST 的高灵敏度,我们还首次测量到显著的偏振,从而能够利用进动旋转矢量模型对其进行建模。在一阶近似下,假设一个圆形空心锥状发射束模式,并假定广义相对论有效,我们推导出该双星系统的轨道倾角(${63^\circ}^{+5^\circ}_{-3^\circ}$)以及脉冲星的自旋几何。发现脉冲星的自旋矢量与轨道角动量矢量之间仅存在轻微的不对准(${0.21^\circ}^{+0.28^\circ}_{-0.10^\circ}$)。所引用的不确定性并不反映由我们的模型假设所引入的系统不确定性。通过模拟未来对轮廓和偏振演化的观测,我们估计在 9 年内可以将进动速率约束在 43% 的不确定性范围内。因此,我们认为该系统的轮廓演化未来可以与精确的脉冲星计时相结合,以检验广义相对论。

英文摘要:

We observe systematic profile changes in the visible pulsar of the compact double neutron star system PSR~J1946+2052 using observations with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The interpulse of PSR~J1946+2052 changed from single-peak to double-peak shape from 2018 to 2021. We attribute this evolution as the result of the relativistic spin precession of the pulsar. With the high sensitivity of FAST, we also measure significant polarization for the first time, allowing us to model this with the precessional rotating vector model. Assuming, to the first order, a circular hollow-cone-like emission beam pattern and taking the validity of general relativity, we derive the binary's orbital inclination angle (${63^\circ}^{+5^\circ}_{-3^\circ}$) and pulsar's spin geometry. Pulsar's spin vector and the orbital angular momentum vector are found to be only slightly misaligned (${0.21^\circ}^{+0.28^\circ}_{-0.10^\circ}$).The quoted uncertainties do not reflect the systematic uncertainties introduced by our model assumptions. By simulating future observations of profile and polarization evolution, we estimate that we could constrain the precession rate within a $43\%$ uncertainty in 9 years. Hence, we suggest that the system's profile evolution could be combined with precise pulsar timing to test general relativity in the future.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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