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Extracting the orbital axis from gravitational waves of precessing binary systems

Kawaguchi, K., Kyutoku, K., Nakano, H., & Shibata, M. (2018). Extracting the orbital axis from gravitational waves of precessing binary systems. Physical Review D, 97: 024017. doi:10.1103/PhysRevD.97.024017.

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### Creators

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Creators:
Kawaguchi, Kyohei1, Author
Kyutoku, Koutarou, Author
Nakano, Hiroyuki, Author
Shibata, Masaru2, Author
Affiliations:
1AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24008
2Computational Relativistic Astrophysics, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_2541714

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
Abstract: We present a new method for extracting the instantaneous orbital axis only from gravitational wave strains of precessing binary systems observed from a particular observer direction. This method enables us to reconstruct the co-precessing frame waveforms only from observed quantities for the ideal case that the signal-to-noise ratio is high enough to analyze the waveforms directly. Specifically, we do not assume knowledge of the time evolution of the instantaneous orbital axis and the co-precessing waveforms before analyzing the data in our method. We test and measure the accuracy of our method using the numerical relativity simulation data of precessing binary black holes taken from the SXS Catalog. We show that the direction of the orbital axis is extracted within $\approx0.02~{\rm rad}$ error from gravitational waves emitted during the inspiral phase. The co-precessing waveforms are also reconstructed with high accuracy; the mismatch (assuming white noise) between them and the original co-precessing waveforms is typically a few times $10^{-3}$ including the merger-ringdown phase, and can be improved by an order of magnitude focusing only on the inspiral waveform. In this method, the co-precessing frame waveforms are not only the purely technical tools for understanding the complex nature of precessing waveforms but also direct observables.

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Dates: 2017-05-212018
Publication Status: Published in print
Pages: 11 pages, 8 figures, 1 table
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1705.07459
URI: http://arxiv.org/abs/1705.07459
DOI: 10.1103/PhysRevD.97.024017
Degree: -

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### Source 1

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Title: Physical Review D
Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 97 Sequence Number: 024017 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: https://pure.mpg.de/cone/journals/resource/111088197762258