Accretion torque reversals in GRO J1008-57 revealed by Insight-HXMT
文献类型：期刊论文
| 作者 | Wang, W.; Tang, Y. M.; Tuo, Y. L.; Epili, P. R.; Zhang, S. N.; Song, L. M.; Lu, F. J.; Qu, J. L.; Zhang, S.; Ge, M. Y. |
| 刊名 | Journal of High Energy Astrophysics
 |
| 出版日期 | 2021 |
| 卷号 | 30页码:1 |
| ISSN号 | 2214-4048 |
| DOI | 10.1016/j.jheap.2021.01.002 |
| 英文摘要 | GRO J1008-57, as a Be/X-ray transient pulsar, is considered to have the highest magnetic field in known neutron star X-ray binary systems. Observational data of the X-ray outbursts in GRO J1008-57 from 2017 to 2020 were collected by the Insight-HXMT satellite. In this work, the spin period of the neutron star in GRO J1008-57 was determined to be about 93.28 seconds in August 2017, 93.22 seconds in February 2018, 93.25 seconds in June 2019 and 93.14 seconds in June 2020. GRO J1008-57 evolved in the spin-up process with a mean rate of - (2.10 ± 0.05) ×10-4 s/d from 2009 - 2018, and turned into a spin down process with a rate of (6.7 ± 0.6) ×10-5 s/d from Feb 2018 to June 2019. During the type II outburst of 2020, GRO J1008-57 had the spin-up torque again. During the torque reversals, the pulse profiles and continuum X-ray spectra did not change significantly, and the cyclotron resonant scattering feature around 80 keV was only detected during the outbursts in 2017 and 2020. Based on the observed mean spin-up rate, we estimated the inner accretion disk radius in GRO J1008-57 (about 1 - 2 times of the Alfvén radius) by comparing different accretion torque models of magnetic neutron stars. During the spin-down process, the magnetic torque should dominate over the matter accreting inflow torque, and we constrained the surface dipole magnetic field B ≥ 6 ×1012 G for the neutron star in GRO J1008-57, which is consistent with the magnetic field strength obtained by cyclotron line centroid energy. |
| WOS记录号 | WOS:000657475900001 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/289769]  |
| 专题 | 高能物理研究所_粒子天体物理中心 硬X射线调制望远镜卫星 |
| 推荐引用方式 GB/T 7714 | Wang, W.,Tang, Y. M.,Tuo, Y. L.,et al. Accretion torque reversals in GRO J1008-57 revealed by Insight-HXMT[J]. Journal of High Energy Astrophysics,2021,30:1. |
| APA | Wang, W..,Tang, Y. M..,Tuo, Y. L..,Epili, P. R..,Zhang, S. N..,...&Zhou, D. K..(2021).Accretion torque reversals in GRO J1008-57 revealed by Insight-HXMT.Journal of High Energy Astrophysics,30,1. |
| MLA | Wang, W.,et al."Accretion torque reversals in GRO J1008-57 revealed by Insight-HXMT".Journal of High Energy Astrophysics 30(2021):1. |
入库方式： OAI收割
来源：高能物理研究所
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