Neutron star (NS) binaries can be potentially intriguing gravitational wave (GW) sources, with both high- and low-frequency radiations from the possibly aspherical individual stars and the binary orbit, respectively. The successful detection of such a dual-line source could provide fresh insights into binary geometry and NS physics. In the absence of electromagnetic observations, we develop a strategy for inferring the spin-orbit misalignment angle using the tight dual-line double NS system under the spin-orbit coupling. Based on the four-year joint detection of a typical dual-line system with LISA and Cosmic Explorer, we find that the misalignment angle and the NS moment of inertia can be measured with sub-percentage and 5% accuracy, respectively.
@article{arxiv.2401.11241,
title = {Inferring binary parameters with dual-line gravitational wave detection from tight inspiraling double neutron stars},
author = {Wen-Fan Feng and Jie-Wen Chen and Tan Liu and Yan Wang and Soumya D. Mohanty},
journal= {arXiv preprint arXiv:2401.11241},
year = {2024}
}