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General Relativity and Quantum Cosmology, gr-qc
Abstract:
We consider the ten confidently detected gravitational-wave signals in the
GWTC-1 catalog which are consistent with mergers of binary black hole systems,
and perform a thorough parameter estimation re-analysis. This is made possible
by using computationally efficient waveform models of the current (fourth)
generation of the IMRPhenom family of phenomenological waveform models, which
consists of the IMRPhenomX frequency-domain modelsand the IMRPhenomT
time-domain models. The analysis is performed with both precessing and
non-precessing waveform models with and without subdominant spherical harmonic
modes. Results for all events are validated with convergence tests, discussing
in particular the events GW170729 and GW151226. For the latter and the other
two lowest-mass events, we also compare results between two independent
sampling codes, Bilby and LALInference. We find overall consistent results with
the original GWTC-1 results, with all Jensen-Shannon divergences between the
previous results using IMRPhenomPv2 and our default IMRPhenomXPHM posteriors
below 0.045 bits, but we also discuss cases where including subdominant
harmonics and/or precession influences the posteriors.
