Inferring the gravitational binding energy and moment of inertia of PSR J0030+0451 and PSR J0740+6620 from new universal relations

作者：Li, Yuxi; Wang, Jue; Wu, Zehan; Wen, Dehua^*

来源：Classical and Quantum Gravity, 2022, 39(3): 035014.

DOI：10.1088/1361-6382/ac45d9

• neutron star
• gravitational binding energy
• moment of inertia

The neutron star interior composition explorer (NICER) recently simultaneously measured the gravitational mass (M-g) and radius (R) of PSR J0030 + 0451 and PSR J0740 + 6620, respectively. Inspired by the groundbreaking observations, we establish two high accuracy universal relations (with the relative error at 1% level) related to M-g and R to infer the gravitational binding energy (BE) (E-g) and moment of inertia (I) of the two pulsars. By combining these universal relations with the data of (M-g, R) released by NICER collaboration, the gravitational BE and moment of inertia of PSR J0030 + 0451 can be constrained within vertical bar E-g vertical bar = 0.21(-0.03)(+0.03) M-circle dot and I = 1.95(-0.50)(+0.70) x 10(45) g cm(2) at 68% credible level, respectively. The gravitational BE and moment of inertia of PSR J0740 + 6620 can be constrained within vertical bar E-g vertical bar = 0.47(-0.12)(+0.09)M(circle dot), and I = 4.65(-0..82)(+1.16) x 10(45) g cm(2) at 68% credible level, respectively.