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Paper: Gravitational Wave Foreground Radiation from Neutron Star-White Dwarf Binaries
Volume: 451, 9th Pacific Rim Conference on Stellar Astrophysics
Page: 57
Authors: Liu, J.; Zhang, Y.; Zhang, H.
Abstract: We investigate the stochastic foreground of gravitational waves (GWs) from ultra-compact neutron star-white dwarf (NS-WD) binaries in our Galaxy or at cosmological space. Observationally, accreting neutron stars and donor white dwarf stars form the low-mass X-ray binaries (LMXBs). Based on the luminosity function determined from X-ray observations, we study the production of NS-WDs using a binary population synthesis approach, and calculate their contribution to the Galactic GW foreground radiation. From a sample of 107 binaries, we calculate the evolutionary processes of these NS-WD systems between 10–5 and 10–2 Hz, which may be detected by the Laser Interferometer Space Antenna (LISA). We conclude that NS-WD binaries due to below the delectability level of the LISA cannot dominate the Galactic GW foreground radiation. This is because that the GW signal of NS-WD systems will be burred by that of close double white dwarf systems. We argue that several Galactic NS-WD binaries may be resolved by LISA due to the short orbital period. Meanwhile, the extragalactic foreground is unlikely to be detected.
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