Searching for Galactic White Dwarf Binaries in Mock LISA Data using an F-Statistic Template Bank

Abstract

We describe an F-statistic search for continuous gravitational waves from galactic white-dwarf binaries in simulated LISA Data. Our search method employs a hierarchical template-grid based exploration of the parameter space. In the first stage, candidate sources are identified in searches using different simulated laser signal combinations (known as TDI variables). Since each source generates a primary maximum near its true "Doppler parameters" (intrinsic frequency and sky position) as well as numerous secondary maxima of the F-statistic in Doppler parameter space, a search for multiple sources needs to distinguish between true signals and secondary maxima associated with other, "louder" signals. Our method does this by applying a coincidence test to reject candidates which are not found at nearby parameter space positions in searches using each of the three TDI variables. For signals surviving the coincidence test, we perform a fully coherent search over a refined parameter grid to provide an accurate parameter estimation for the final candidates. Suitably tuned, the pipeline is able to extract 1989 true signals with only 5 false alarms. The use of the rigid adiabatic approximation allows recovery of signal parameters with errors comparable to statistical expectations, although there is still some systematic excess with respect to statistical errors expected from Gaussian noise. An experimental iterative pipeline with seven rounds of signal subtraction and re-analysis of the residuals allows us to increase the number of signals recovered to a total of 3419 with 29 false alarms.

29 pages, 11 figures; submitted to Classical and Quantum Gravity

References in corpus (12)

• Coherent searches for periodic gravitational waves from unknown isolated sources and Scorpius X-1: results from the second LIGO science run
• Tests of Bayesian Model Selection Techniques for Gravitational Wave Astronomy
• Searching for gravitational waves from Cassiopeia A with LIGO
• The search for continuous gravitational waves: metric of the multi-detector F-statistic
• The Mock LISA Data Challenges: from Challenge 1B to Challenge 3
• A Solution to the Galactic Foreground Problem for LISA
• Report on the second Mock LISA Data Challenge
• Report on the first round of the Mock LISA Data Challenges
• F-statistic search for white-dwarf binaries in the first Mock LISA Data Challenge
• Extracting galactic binary signals from the first round of Mock LISA Data Challenges
• A comment on "The Cauchy problem of f(R)- gravity", Class. Quantum Grav., 24, 5667 (2007), arXiv:0709.4414
• Improved search for galactic white dwarf binaries in Mock LISA Data Challenge 1B using an F-statistic template bank

Cited by in corpus (9)

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• Model-Based Cross-Correlation Search for Gravitational Waves from Scorpius X-1
• Spherical ansatz for parameter-space metrics
• Sliding coherence window technique for hierarchical detection of continuous gravitational waves
• Detecting compact galactic binaries using a hybrid swarm-based algorithm
• Extracting overlapping gravitational-wave signals of galactic compact binaries: a mini review
• All-sky coherent search for continuous gravitational waves in 6-7 Hz band with a torsion-bar antenna