Constraining properties of massive neutron star through R-mode

作者：Wang, Jue; Yang, Shen; Wen, Dehua^*

来源：European Physical Journal A, 2022, 58(7): 132.

DOI：10.1140/epja/s10050-022-00781-z

• GRAVITATIONAL-RADIATION
• NONRADIAL OSCILLATIONS
• RELATIVISTIC STARS
• INSTABILITY
• EQUATION
• MATTER
• SHELL

Taking the GW190814 event as a clue, r-mode of 2.5M(circle dot) supermassive neutron star along with 1.4M(circle dot) canonical neutron star is investigated by using RNS code in the framework of rotating neutron star. Our conclusion further confirms that for the secondary star of GW190814, there exists a possibility that it is a rapid rotating supermassive neutron star in r-mode stable state. For super fast rotating neutron star with fixed spin frequency, the lower limit of its mass M-min can be constrained by the critical spin frequency under r-mode. As the M-min is EOS (equation of state) dependent, if the mass of neutron star with very high spin frequency can be observed in the future, the EOS of super-dense nuclear matter can be constrained by comparing the M-min of different EOSs. At last, the effect of crust-core transition densities on r-modes of neutron stars is explored and discussed.