Confusion noise estimate for gravitational wave measurements in space

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Gravitational Wave Detectors And Experiments, Gravitational Radiation Detectors, Mass Spectrometers, And Other Instrumentation And Techniques

Scientific paper

LISA's sensitivity for studying gravitational waves is expected to be confusion noise limited from roughly 0.1-3 mHz due to unresolvable signals from very many close binaries throughout the Galaxy. The most important contributors to the confusion noise appear to be close white dwarf binaries. However, there are additional binary systems that we have not considered before. These include systems of helium-rich secondaries in semidetached binaries with CO white dwarf primaries. Observational astronomers refer to these systems as AM CVn binaries. The theory of close binary evolution suggests at least two different scenarios that lead to the AM CVn stage. We will discuss both scenarios and will show that their inclusion probably will lead to only a small increase in the confusion noise.

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