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Neutron star (NS) binaries can be potentially intriguing gravitational wave(GW) sources, with both high- and low-frequency radiations from the possiblyaspherical individual stars and the binary orbit, respectively. The successfuldetection of such a dual-line source could provide fresh insights into binarygeometry and NS physics. In the absence of electromagnetic observations, wedevelop a strategy for inferring the spin-orbit misalignment angle using thetight dual-line double NS system under the spin-orbit coupling. Based on thefour-year joint detection of a typical dual-line system with LISA and CosmicExplorer, we find that the misalignment angle and the NS moment of inertia canbe measured with sub-percentage and 5% accuracy, respectively.

Inferring binary parameters with dual-line gravitational wave detection from tight inspiraling double neutron stars