PSR J0030+0451, GW170817 and the nuclear data: joint constraints on equation of state and bulk properties of neutron stars

Jin-Liang Jiang; Shao-Peng Tang; Yuan-Zhu Wang; Yi-Zhong Fan; Da-Ming Wei

doi:10.3847/1538-4357/ab77cf

paper

PSR J0030+0451, GW170817 and the nuclear data: joint constraints on equation of state and bulk properties of neutron stars

arXiv:1912.07467 · doi:10.3847/1538-4357/ab77cf

Abstract

Very recently the NICER collaboration has published the first-ever accurate measurement of mass and radius together for PSR J0030+0451, a nearby isolated quickly-rotating neutron star (NS). In this work we set the joint constraints on the equation of state (EoS) and some bulk properties of NSs with the data of PSR J0030+0451, GW170817 and some nuclear experiments. The piecewise polytropic expansion method and the spectral decomposition method have been adopted to parameterize the EoS. The resulting constraints are consistent with each other. Assuming the maximal gravitational mass of non-rotating NS $M_{TOV}$ lies between $2.04 M_{⊙}$ and $2.4 M_{⊙}$ , with the piecewise method the pressure at twice nuclear saturation density is measured to be $3.3 8_{- 1.50}^{+ 2.43} \times 1 0^{34} dyn c m^{- 2}$ at the $90%$ level. For a NS with canonical mass of $1.4 M_{⊙}$ , we have the moment of inertia $I_{1.4} = 1.43_{- 0.13}^{+ 0.28} \times 1 0^{38} kg \cdot m^{2}$ , tidal deformability $Λ_{1.4} = 39 0_{- 140}^{+ 320}$ , radius $R_{1.4} = 12. 2_{- 0.9}^{+ 1.0} km$ , and binding energy $B E_{1.4} = 0.16_{- 0.02}^{+ 0.01} M_{⊙}$ at the $90%$ level, which are improved in comparison to the constraints with the sole data of GW170817.

arXiv comment9 pages, 3 figures, 2 tables, ApJ accepted

PSR J0030+0451, GW170817 and the nuclear data: joint constraints on equation of state and bulk properties of neutron stars

Abstract

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