A More Stringent Constraint on the Mass Ratio of Binary Neutron Star Merger GW170817

摘要

Recently, the LIGO-Virgo Collaborations reported their first detection of gravitational-wave (GW) signals from the low-mass compact binary merger GW170817, which is most likely due to a double neutron star (NS) merger. With the GW signals only, the chirp mass of the binary is precisely constrained to 1.188_(-0.002)~(+0.004) M_⊙, but the mass ratio is loosely constrained in the range 0.4-1, so that a very rough estimation of the individual NS masses (1.36 M_⊙