BNS observations and early warnings in the era of decihertz & multiband GW detection

Liu Chang

The detections of gravitational waves (GWs) from binary neutron star (BNS) systems provide new insights into dense matter properties in extreme conditions and associated high-energy astrophysical processes. However, currently, information about NS equation of state (EoS) is extracted with limited precision. Meanwhile, the fruitful results from the observations of electromagnetic (EM) waves alongside GW170817 show the necessity of early warning alerts. Accurate measurements of the matter effects and sky location could be achieved by joint GW detection from space and ground. In our work, we use the Fisher information matrix analysis to investigate the multiband synergy between the space-borne decihertz GW detectors and the ground-based Einstein Telescope (ET). We specially focus on the parameters pertaining to spin-induced quadrupole moment, tidal deformability, and sky localization. Furthermore, we investigated the detection rates and early warning parameters of binary neutron star (BNS) populations with decihertz GW observatories in a realistic detecting strategy.