Mass and radius formulas for low-mass neutron stars
Mass and radius formulas for low-mass neutron stars
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低质量中子星的质量和半径公式
DOI：
10.1093/ptep/ptu052
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
Akira Ohnishi
中科院分区：
文献类型：
--
作者：
Hajime Sotani;Kei Iida;Kazuhiro Oyamatsu;Akira Ohnishi
大质量恒星死亡时产生的中子星通常被视为巨大的富中子核。这张图与低质量（低于太阳质量）中子星尤其相关，其中预计不会出现非核成分。由于核子物质的饱和特性，导致著名的原子核液滴图，经验核质量和半径可以近似表示为原子质量数的函数。然而，即使在低质量范围内，表达中子星的质量和半径也不是直截了当的，其中结构由富中子核物质的压力和重力之间的平衡决定。考虑到可能同时进行质量和半径测量，这样的表达式将非常有用。在这里，我们成功地从各种模型中构建了低质量中子星的质量和半径的理论公式，这些模型与稳定核的经验质量和半径一致。在此过程中，我们发现了一个新的状态方程参数，该参数表征了低质量中子星的结构。该参数在连接实验室原子核的质量半径关系与天体质量半径关系方面发挥着关键作用，可能会受到未来对低质量中子星的观测的限制。
Neutron stars, produced at the death of massive stars, are often regarded as giant neutron-rich nuclei. This picture is especially relevant for low-mass (below about solar mass,) neutron stars, where non-nucleonic components are not expected to occur. Due to the saturation property of nucleonic matter, leading to the celebrated liquid-drop picture of atomic nuclei, empirical nuclear masses and radii can be approximately expressed as a function of atomic mass number. It is, however, not straightforward to express masses and radii of neutron stars even in the low-mass range where the structure is determined by a balance between the pressure of neutron-rich nucleonic matter and gravity. Such expressions would be of great use given possible simultaneous mass and radius measurements. Here we successfully construct theoretical formulas for the masses and radii of low-mass neutron stars from various models that are consistent with empirical masses and radii of stable nuclei. In this process, we discover a new equation-of-state parameter that characterizes the structure of low-mass neutron stars. This parameter, which plays a key role in connecting the mass–radius relation of the laboratory nuclei to that of the celestial objects, could be constrained from future observations of low-mass neutron stars.
DOI：
10.1088/0004-637x/742/2/122
发表时间：
2010-04
期刊：
The Astrophysical Journal
影响因子：
--
作者：
V. Suleimanov;J. Poutanen;M. Revnivtsev;K. Werner
通讯作者：
V. Suleimanov;J. Poutanen;M. Revnivtsev;K. Werner
从原子核到恒星：纪念杰拉尔德·E·布朗的纪念文集
影响因子：
--
作者：
Sabine Lee
通讯作者：
Sabine Lee
影响因子：
8.6
作者：
Sotani, Hajime;Nakazato, Ken'ichiro;Oyamatsu, Kazuhiro
通讯作者：
Oyamatsu, Kazuhiro