Finite size effects on the light curves of slowly-rotating neutron stars
Finite size effects on the light curves of slowly-rotating neutron stars
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DOI：
10.1103/physrevd.100.043006
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发表时间：
2019-05
影响因子：
5
通讯作者：
H. Sotani;Hector O. Silva;G. Pappas
中科院分区：
文献类型：
--
作者：
H. Sotani;Hector O. Silva;G. Pappas
在研究旋转中子星表面热点所产生的光变曲线时，一个重要的问题是，放松一些简化的假设，比如像点状点这样的简化假设，会对光变曲线的形状产生什么影响。在这项工作中，我们探讨了光变曲线的大小和形状的一个单一的热点上的缓慢旋转的中子星表面。更具体地说，我们考虑两种不同的形状的热点（圆形和环形），并检查所得到的光变曲线的热点（两者）和宽度（后者）的开度角的函数。我们发现，点状近似可以合理地描述光变曲线，如果热点的开口角小于$\sim 5 ^\circ $。此外，我们发现，从环形光斑的光变曲线几乎是相同的，如果开口角小于$\sim 35 ^\circ $独立的热点的宽度。
An important question when studying the light curves produced by hot spots on the surface of rotating neutron stars is, how might the shape of the light curve be affected by relaxing some of the simplifying assumptions that one would adopt on a first treatment of the problem, such as that of a point-like spot. In this work we explore the dependence of light curves on the size and shape of a single hot spot on the surface of slowly-rotating neutron stars. More specifically, we consider two different shapes for the hot spots (circular and annular) and examine the resulting light curves as functions of the opening angle of the hot spot (for both) and width (for the latter). We find that the point-like approximation can describe light curves reasonably well, if the opening angle of the hot spot is less than $\sim 5^\circ$. Furthermore, we find that light curves from annular spots are almost the same as those of the full circular spot if the opening angle is less than $\sim 35^\circ$ independently of the hot spot's width.