An improved analysis of GW150914 using a fully spin-precessing waveform model

Abstract : This paper presents updated estimates of source parameters for GW150914, a binary black-hole coalescence event detected by the Laser Interferometer Gravitational-wave Observatory (LIGO) on September 14, 2015 [1]. Reference presented parameter estimation [2] of the source using a 13-dimensional, phenomenological precessing-spin model (precessing IMRPhenom) and a 11-dimensional nonprecessing effective-one-body (EOB) model calibrated to numerical-relativity simulations, which forces spin alignment (nonprecessing EOBNR). Here we present new results that include a 15-dimensional precessing-spin waveform model (precessing EOBNR) developed within the EOB formalism. We find good agreement with the parameters estimated previously [2], and we quote updated component masses of 35+5−3M⊙ and 30+3−4M⊙ (where errors correspond to 90% symmetric credible intervals). We also present slightly tighter constraints on the dimensionless spin magnitudes of the two black holes, with a primary spin estimate 0.65 and a secondary spin estimate 0.75 at 90% probability. Reference [2] estimated the systematic parameter-extraction errors due to waveform-model uncertainty by combining the posterior probability densities of precessing IMRPhenom and nonprecessing EOBNR. Here we find that the two precessing-spin models are in closer agreement, suggesting that these systematic errors are smaller than previously quoted.
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Contributeur : Claudine Bombar <>
Soumis le : lundi 6 juin 2016 - 10:06:58
Dernière modification le : jeudi 4 octobre 2018 - 14:40:10

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B.P. Abbott, T. Adams, R. Bonnand, D. Buskulic, M. Ducrot, et al.. An improved analysis of GW150914 using a fully spin-precessing waveform model. Physical Review X, American Physical Society, 2016, 6, pp.041014. 〈10.1103/PhysRevX.6.041014〉. 〈in2p3-01326869〉

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