A semi-coherent search strategy for known continuous wave sources in binary systems

Abstract

We present a method for detection of weak continuous signals from sources in binary systems via the incoherent combination of many "short" coherently-analyzed segments. The main focus of the work is on the construction of a metric on the parameter space for such signals for use in matched-filter based searches. The metric is defined using a maximum likelihood detection statistic applied to a binary orbit phase model including eccentricity. We find that this metric can be accurately approximated by its diagonal form in the regime where the segment length is << the orbital period. Hence correlations between parameters are effectively removed by the combination of many independent observation. We find that the ability to distinguish signal parameters is independent of the total semi-coherent observation span (for the semi-coherent span >> the segment length) for all but the orbital angular frequency. Increased template density for this parameter scales linearly with the observation span. We also present two example search schemes. The first uses a re parameterized phase model upon which we compute the metric on individual short coherently analyzed segments. The second assumes long >> the orbital period segment lengths from which we again compute the coherent metric and find it to be approximately diagonal. In this latter case we also show that the semi-coherent metric is equal to the coherent metric.

18 pages, 4 figures

References in corpus (9)

• Detecting gravitational wave emission from the known accreting neutron stars
• Upper limit map of a background of gravitational waves
• A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters
• Template-based searches for gravitational waves: efficient lattice covering of flat parameter spaces
• Exploiting Large-Scale Correlations to Detect Continuous Gravitational Waves
• Building a stochastic template bank for detecting massive black hole binaries
• Parameter-space correlations of the optimal statistic for continuous gravitational-wave detection
• A fast search strategy for gravitational waves from low-mass X-ray binaries
• A hierarchical search for gravitational waves from supermassive black hole binary mergers

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