Modelling the observable behaviour of SXP 5.05

Modelling the observable behaviour of SXP 5.05
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对 SXP 5.05 的可观察行为进行建模

DOI:
10.1093/mnras/stz1037
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发表时间:
2019
影响因子:
4.8
通讯作者:
Brown R
Brown R
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brown R

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SXP 5.05是一颗Be/X射线双星,伴有一颗中子星星,位于小麦哲伦星云。它于2013年首次被发现,同年晚些时候,SXP 5.05经历了大规模的光学和X射线爆发。这一爆发使过去5年来在该系统中观测到的任何其他光学事件相形见绌。系统光学亮度的大幅增加意味着Be星星的拱星盘的大小和密度增加。X射线数据显示中子星星在每个轨道上有两次掩星,这与中子星星从Be星星后面经过的情况不一致,因此这些掩星是由圆盘造成的。在本文中,我们模型的Be/中子星星二进制SXP 5.05的爆发是由于大量增加的质量喷射的Be星星。中子星星直接穿过生长盘,结果表明,由此产生的遮蔽可以定性地解释所观察到的系统的X射线行为。我们发现,再现所观察到的系统光学行为的时间尺度的唯一方法是在短时间内(<2个轨道)大幅增加质量喷射,并在事件期间降低粘度。模型还再现了所观察到的X射线和H α线发射的一般行为。然而,推断的质量喷射和粘度需要产生一个足够快的磁盘大小的增加都高于建议由以前的作品。
SXP 5.05 is a Be/X-ray binary with a neutron star companion located in the Small Magellanic Cloud. It was first detected in 2013, and later that year, SXP 5.05 underwent a massive optical and X-ray outburst. This outburst dwarfs any other optical event that has been observed for this system during the last 5 yr. The large increase in optical brightness of the system implies an increase in the size and density of the Be star’s circumstellar disc. The X-ray data show two occultations of the neutron star per orbit and are not consistent with a neutron star passing behind the Be star, and hence the disc is responsible for these occultations. In this paper, we model the outburst of Be/neutron star binary SXP 5.05 as being due to a large increase in mass ejection by the Be star. The neutron star passes directly through the growing disc, and it is shown that the resulting obscuration can qualitatively explain the observed X-ray behaviour of the system. We find the only way to reproduce the time-scales of the observed optical behaviour of the system is to increase the mass ejection substantially for a short time (<2 orbits) and to decrease the viscosity during the event. The general behaviour of the observed X-ray and H α line emission are also reproduced by the model. However, the inferred mass ejection and viscosity needed to produce a sufficiently rapid increase of disc size are both higher than suggested by previous works.
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