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ID: 251024.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
Simulation of the white dwarf-white dwarf galactic background in the LISA data
Authors:Edlund, J. A.; Tinto, M.; Krolak, Andrzej; Nelemans, G.
Date of Publication (YYYY-MM-DD):2005-09-21
Title of Journal:Classical and Quantum Gravity
Journal Abbrev.:Class. Quantum Gravity
Issue / Number:18 Sp. Iss. Sp. Iss. SI
Start Page:S913
End Page:S926
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Laser Interferometer Space Antenna (LISA) is a proposed mission to detect and study gravitational radiation in the frequency range from 10-4 to 10-1 Hz. In the low part of its frequency band, the LISA data will contain a stochastic signal consisting of an incoherent superposition of hundreds of millions of gravitational wave signals radiated by inspiraling white-dwarf binaries present in our own galaxy. In order to estimate the LISA response to this background, we have simulated a population of white-dwarf binaries recently synthesized by one of us. Our approach relies on an analytic expressions of the LISA Time-Delay Interferometric responses to the gravitational radiation emitted by such systems, and it allows us to implement a computationally efficient and accurate simulation of the background in the LISA data. We find the amplitude of the galactic white-dwarf binary background in the LISA data to be modulated in time with a period of 1 year, reaching a minimum equal to about twice that of the LISA noise for a period of about 2 months around the time when the Sun–LISA direction is roughly oriented towards the Autumn equinox. This modulation means that the galactic white-dwarf background that will be observable by LISA is a cyclostationary random process with a period of 1 year. We summarize the theory of cyclostationary random processes and present the corresponding generalized spectral method needed to characterize such a process in the LISA data. We find that, by measuring the generalized spectral components of the white-dwarf background, LISA will be able to infer properties of the distribution of the white-dwarf binary systems present in our galaxy.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
MPI für Gravitationsphysik/Teilinstitut Hannover
External Affiliations:CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.; Max Planck Inst Gravitat Phys, Albert Einstein Inst, D-14476 Golm, Germany.; Radboud Univ Nijmegen, IMAPP, Dept Astrophys, Nijmegen, Netherlands.
Identifiers:ISI:000232325800006 [ID No:1]
ISSN:0264-9381 [ID No:2]
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