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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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