An improved analysis of GW150914 using a fully spin-precessing waveform model
B.P. Abbott
,
T. Adams
(1)
,
R. Bonnand
(1)
,
D. Buskulic
(1)
,
M. Ducrot
(1)
,
V. Germain
(1)
,
R. Gouaty
(1)
,
N. Letendre
(1)
,
F. Marion
(1)
,
A. Masserot
(1)
,
B. Mours
(1)
,
L. Rolland
(1)
,
D. Verkindt
(1)
,
M. Was
(1)
,
M. Yvert
(1)
,
N. Arnaud
(2)
,
M. A. Bizouard
(2)
,
V. Brisson
(2)
,
J. Casanueva Diaz
(2)
,
F. Cavalier
(2)
,
M. Davier
(2)
,
S. Franco
(2)
,
P. Hello
(2)
,
D. Huet
(2)
,
M. Kasprzack
(2)
,
N. Leroy
(2)
,
F. Robinet
(2)
,
M. Boër
(3)
,
G. Bogaert
(3)
,
A. Brillet
(3)
,
F. Cleva
(3)
,
S. Di Pace
(3)
,
J.-P. Coulon
(3)
,
H. Dereli
(3)
,
D. Fiorucci
(3)
,
J.-D. Fournier
(3)
,
B. Gendre
(3)
,
F. Kéfélian
(3)
,
N. Man
(3)
,
L. Martellini
(3)
,
D. Meacher
(3)
,
M. Merzougui
(3)
,
M. Pichot
(3)
,
T. Regimbau
(3)
,
K. Siellez
(3)
,
M. Turconi
(3)
,
J.-Y. Vinet
(3)
,
L.-W. Wei
(3)
,
G. Cagnoli
(4)
,
J. Degallaix
(4)
,
V. Dolique
(4)
,
R. Flaminio
(4)
,
M. Granata
(4)
,
D. Hofman
(4)
,
C. Michel
(4)
,
R. Pedurand
(4)
,
L. Pinard
(4)
,
B. Sassolas
(4)
,
N. Straniero
(4)
,
François Bondu
(5)
B.P. Abbott
- Fonction : Auteur
L. Rolland
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D. Verkindt
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M. Was
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N. Arnaud
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M. A. Bizouard
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F. Cavalier
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N. Leroy
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M. Boër
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G. Bogaert
- Fonction : Auteur
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F. Kéfélian
- Fonction : Auteur
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J. Degallaix
- Fonction : Auteur
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François Bondu
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Résumé
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.