Radial and nonradial oscillations of inverted hybrid stars

被引：8

作者：

Zhang, Chen ^{[1
]}

Luo, Yudong ^{[2
,3
]}

Li, Hong -Bo ^{[2
,3
]}

Shao, Lijing ^{[3
,4
]}

Xu, Renxin ^{[2
,3
]}

机构：

[1] Hong Kong Univ Sci & Technol, HKUST Jockey Club Inst Adv Study, Hong Kong, Peoples R China

[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[3] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[4] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

PHYSICAL REVIEW D | 2024年 / 109卷 / 06期

基金：

中国国家自然科学基金;

关键词：

EQUATION-OF-STATE; NEUTRON-STARS; RELATIVISTIC STARS; G-MODES; QUARK MATTER; PULSATIONS; PARAMETERS; SEPARATION; STABILITY; FAMILY;

D O I：

10.1103/PhysRevD.109.063020

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the radial and nonradial oscillations of Cross stars (CrSs), i.e., stars with a quark matter crust and a hadronic matter core in an inverted order compared to conventional hybrid stars. We draw comparisons of their oscillation modes with those of neutron stars, quark stars, and conventional hybrid stars. We find that the stellar stability analysis from the fundamental mode of radial oscillations, and the g, f modes of nonradial oscillations are quite similar to those of conventional hybrid stars. However, due to the inverted stellar structure, the first nonradial p-mode of CrSs behaves in an inverted way and sits in a higher-frequency domain compared to that of conventional hybrid stars. These results provide a direct way to discriminate CrSs from other types of compact stars via gravitational wave (GW) probes. Specifically, compact stars emitting g-mode GWs within the 0.5-1 kHz range should be CrSs or conventional hybrid stars rather than neutron stars or pure quark stars, and a further GW detection of the first p-mode above 8 kHz or an identification of a decreasing trend of frequencies versus star masses associated with it will help identify the compact object to be a CrS rather than a conventional hybrid star.

引用

页数：11

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