Eccentricity Estimation for Five Binary Black Hole Mergers with Higher-order Gravitational-wave Modes

Eccentricity Estimation for Five Binary Black Hole Mergers with Higher-order Gravitational-wave Modes

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The detection of orbital eccentricity for a binary black hole system via gravitational waves is a key signature to distinguish between the possible binary origins.The identification of eccentricity has been difficult so far due to the limited availability of eccentric gravitational waveforms over the full range of black hole masses and eccentricities.Here we evaluate the eccentricity of five black hole mergers detected by the LIGO and Virgo observatories using the TEOBResumS-DALI , TEOBResumS-GIOTTO , and TEOBResumSP models.

This analysis studies eccentricities up 220.10.38.20.02.001 to 0.6 at the reference frequency of 5 Hz and incorporates higher-order gravitational-wave modes critical to model emission from highly eccentric orbits.The binaries have been selected due to previous hints of eccentricity or due to their unusual mass and spin.

While other studies found marginal evidence for eccentricity for some of these events, our analyses do not favor the incorporation of eccentricity compared to the quasi-circular case.While lacking the eccentric evidence hot deal zone funko pop of other analyses, we find our analyses marginally shifts the posterior in multiple parameters for several events when allowing eccentricity to be nonzero.