Projects per year
Abstract
This paper presents updated estimates of source parameters for GW150914, a binary blackhole coalescence event detected by the Laser Interferometer Gravitationalwave Observatory (LIGO) in 2015 [Abbott et al. Phys. Rev. Lett. 116, 061102 (2016).]. Abbott et al. [Phys. Rev. Lett. 116, 241102 (2016).] presented parameter estimation of the source using a 13dimensional, phenomenological precessingspin model (precessing IMRPhenom) and an 11dimensional nonprecessing effectiveone body (EOB) model calibrated to numericalrelativity simulations, which forces spin alignment (nonprecessing EOBNR). Here, we present new results that include a 15dimensional precessingspin waveform model (precessing EOBNR) developed within the EOB formalism. We find good agreement with the parameters estimated previously [Abbott et al. Phys. Rev. Lett. 116, 241102 (2016).], and we quote updated component masses of 35 ^{+5} _{3} M· and 30 ^{+5} _{3} M· (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. Abbott et al. [Phys. Rev. Lett. 116, 241102 (2016).] estimated the systematic parameterextraction errors due to waveformmodel uncertainty by combining the posterior probability densities of precessing IMRPhenom and nonprecessing EOBNR. Here, we find that the two precessingspin models are in closer agreement, suggesting that these systematic errors are smaller than previously quoted.
Original language  English 

Article number  041014 
Number of pages  19 
Journal  Physical Review X 
Volume  6 
Issue number  4 
DOIs  
Publication status  Published  2016 
Projects
 2 Finished

An upgraded pulsar timing array for gravitational wave detection
Levin, Y., Bailes, M., Hobbs, G. B., Manchester, R. & van Straten, W.
Australian Research Council (ARC)
21/01/14 → 31/01/16
Project: Research

Gravitationalwave astrophysics of binary black holes
Levin, Y.
Australian Research Council (ARC), Monash University
1/06/12 → 1/08/17
Project: Research