Header

UZH-Logo

Maintenance Infos

Wider look at the gravitational-wave transients from GWTC-1 using an unmodeled reconstruction method


Salemi, F; Milotti, E; Prodi, G A; Vedovato, G; Lazzaro, C; Tiwari, S; Vinciguerra, S; Drago, M; Klimenko, S (2019). Wider look at the gravitational-wave transients from GWTC-1 using an unmodeled reconstruction method. Physical review D, 100(4):042003.

Abstract

In this paper, we investigate the morphology of the events from the GWTC-1 catalog of compact binary coalescences as reconstructed by a method based on coherent excess power: we use an open-source version of the coherent WaveBurst (cWB) analysis pipeline, which does not make use of waveform models. The coherent response of the LIGO-Virgo network of detectors is estimated by using loose bounds on the duration and bandwidth of the signal. This pipeline version reproduces the same results that are reported for cWB in recent publications by the LIGO and Virgo collaborations. In particular, the sky localization and waveform reconstruction are in a good agreement with those produced by methods which exploit the detailed theoretical knowledge of the expected waveform for compact binary coalescences. However, in some cases cWB also detects features in excess in well-localized regions of the time-frequency plane. Here we focus on such deviations and present the methods devised to assess their significance. Out of the 11 events reported in the GWTC-1, in two cases—GW151012 and GW151226—cWB detects an excess of coherent energy after the coalescence (Δt≃0.2 and ≃0.1  s, respectively) with p-values that call for further investigations (0.004 and 0.03, respectively), though they are not sufficient to exclude noise fluctuations. We discuss the morphological properties and plausible interpretations of these features. In case they are genuine, we anticipate that several more such outliers will be uncovered by our methodology in the ongoing advanced LIGO-Virgo observation run (O3).

Abstract

In this paper, we investigate the morphology of the events from the GWTC-1 catalog of compact binary coalescences as reconstructed by a method based on coherent excess power: we use an open-source version of the coherent WaveBurst (cWB) analysis pipeline, which does not make use of waveform models. The coherent response of the LIGO-Virgo network of detectors is estimated by using loose bounds on the duration and bandwidth of the signal. This pipeline version reproduces the same results that are reported for cWB in recent publications by the LIGO and Virgo collaborations. In particular, the sky localization and waveform reconstruction are in a good agreement with those produced by methods which exploit the detailed theoretical knowledge of the expected waveform for compact binary coalescences. However, in some cases cWB also detects features in excess in well-localized regions of the time-frequency plane. Here we focus on such deviations and present the methods devised to assess their significance. Out of the 11 events reported in the GWTC-1, in two cases—GW151012 and GW151226—cWB detects an excess of coherent energy after the coalescence (Δt≃0.2 and ≃0.1  s, respectively) with p-values that call for further investigations (0.004 and 0.03, respectively), though they are not sufficient to exclude noise fluctuations. We discuss the morphological properties and plausible interpretations of these features. In case they are genuine, we anticipate that several more such outliers will be uncovered by our methodology in the ongoing advanced LIGO-Virgo observation run (O3).

Statistics

Citations

Altmetrics

Downloads

11 downloads since deposited on 09 Jan 2020
11 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Uncontrolled Keywords:Physics and Astronomy (miscellaneous)
Language:English
Date:28 August 2019
Deposited On:09 Jan 2020 11:42
Last Modified:14 Feb 2020 08:28
Publisher:American Physical Society
ISSN:2470-0010
OA Status:Green
Publisher DOI:https://doi.org/10.1103/physrevd.100.042003
Project Information:
  • : FunderSNSF
  • : Grant ID200020_182047
  • : Project TitleGeneral relativity and gravitational wave astronomy

Download

Green Open Access

Download PDF  'Wider look at the gravitational-wave transients from GWTC-1 using an unmodeled reconstruction method'.
Preview
Content: Published Version
Filetype: PDF
Size: 4MB
View at publisher