2017年10月

# Probing crustal structures from neutron star compactness

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
• Hajime Sotani
• ,
• Kei Iida
• ,
• Kazuhiro Oyamatsu

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DOI
10.1093/mnras/stx1510

OXFORD UNIV PRESS

With various sets of the parameters that characterize the equation of state (EOS) of nuclear matter, we systematically examine the thickness of a neutron star crust and of the pasta phases contained therein. Then, with respect to the thickness of the phase of spherical nuclei, the thickness of the cylindrical phase and the crust thickness, we successfully derive fitting formulas that express the ratio of each thickness to the star's radius as a function of the star's compactness, the incompressibility of symmetric nuclear matter and the density dependence of the symmetry energy. In particular, we find that the thickness of the phase of spherical nuclei has such a strong dependence on the stellar compactness as the crust thickness, but both of them show a much weaker dependence on the EOS parameters. Thus, via determination of the compactness, the thickness of the phase of spherical nuclei as well as the crust thickness can be constrained reasonably, even if the EOS parameters remain to be well-determined.

Web of Science ® 被引用回数 : 10

リンク情報
DOI
https://doi.org/10.1093/mnras/stx1510
Web of Science