Kavli Affiliate: Lijing Shao
| First 5 Authors: , , , ,
| Summary:
Double neutron star (DNS) systems could serve as intriguing dual-line
gravitational-wave (GW) sources, emitting both high- and low-frequency GWs,
arising respectively from the asymmetric spinning bodies of individual neutron
stars (NSs) and the binary orbital inspiral. Detecting such dual-line signals
could provide novel perspectives on binary orbital geometry and NS internal
physics. We expand upon previously calculated spinning NS waveforms by
incorporating higher-order terms of NS structural parameters. A population
simulation is performed for spinning NS components in DNS systems potentially
detectable by the space-based Laser Interferometer Space Antenna (LISA). Based
on 4-year LISA observation of 35 resolvable DNS systems under an optimistic
scenario, we estimate that 6 (22) spinning NS components could be detected by
the next-generation ground-based GW detector, Cosmic Explorer, under
log-uniform (uniform) sampling of NS structural parameters. For these dual-line
sources, the median signal-to-noise ratio achievable with Cosmic Explorer is
approximately 20–30. Through the dual-line GW detection strategy, the relative
measurement accuracy of the NS moment of inertia is estimated to be $sim 8%$.
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