Driving unmodeled gravitational-wave transient searches using astrophysical information

P. Bacon, V. Gayathri, E. Chassande-Mottin, A. Pai, F. Salemi, and G. Vedovato
Phys. Rev. D 98, 024028 – Published 16 July 2018

Abstract

Transient gravitational-wave searches can be divided into two main families of approaches: modeled and unmodeled searches, based on matched filtering techniques and time-frequency excess power identification respectively. The former, mostly applied in the context of compact binary searches, relies on the precise knowledge of the expected gravitational-wave phase evolution. This information is not always available at the required accuracy for all plausible astrophysical scenarios, e.g., in the presence of orbital precession, or eccentricity. The other search approach imposes little priors on the targeted signal. We propose an intermediate route based on a modification of unmodeled search methods in which time-frequency pattern matching is constrained by astrophysical waveform models (but not requiring accurate prediction for the waveform phase evolution). The set of astrophysically motivated patterns is conveniently encapsulated in a graph, that encodes the time-frequency pixels and their co-occurrence. This allows the use of efficient graph-based optimization techniques to perform the pattern search in the data. We show in the example of black-hole binary searches that such an approach leads to an averaged increase in the distance reach (+78%) for this specific source over standard unmodeled searches.

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  • Received 11 May 2018
  • Corrected 3 August 2018

DOI:https://doi.org/10.1103/PhysRevD.98.024028

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Corrections

3 August 2018

Correction: The lower panel of the previously published Fig. 6 contained an error and its corrected replacement has been posted.

Authors & Affiliations

P. Bacon1,*, V. Gayathri2, E. Chassande-Mottin1, A. Pai2, F. Salemi3, and G. Vedovato4

  • 1APC, Université Paris Diderot, CNRS/IN2P3, CEA/Irfu, Observatoire de Paris, Sorbonne Paris Cité, F-75013 Paris, France
  • 2Department of Physics, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400076, India
  • 3Max Planck Institute for Gravitational Physics (Albert Einstein Institute), D-30167 Hannover, Germany
  • 4INFN, Sezione di Padova, I-35131 Padova, Italy

  • *Corresponding author. bacon@apc.in2p3.fr

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Issue

Vol. 98, Iss. 2 — 15 July 2018

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