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arXiv · 2503.13062

Time-domain phenomenological multipolar waveforms for aligned-spin binary black holes in elliptical orbits

Maria de Lluc Planas·Antoni Ramos-Buades·Cecilio García-Quirós·Héctor Estellés·Sascha Husa·Maria Haney
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Abstract

We introduce IMRPhenomTEHM, a new phenomenological time-domain model for eccentric aligned-spin binary black holes. Building upon the accurate quasi-circular IMRPhenomTHM model, IMRPhenomTEHM integrates the eccentric post-Newtonian (PN) dynamics and introduces eccentric corrections into the waveform multipoles up to 3PN, including spin effects. The model incorporates the dominant (2, $\pm$2) spherical harmonic mode, as well as the subdominant modes (2, $\pm$1), (3, $\pm$3), (4, $\pm$4), and (5, $\pm$5), assuming the binary has circularized by the time of merger. This approach ensures a smooth transition to the non-eccentric limit, providing an accurate quasi-circular limit against the IMRPhenomTHM model. When comparing against 28 public eccentric numerical relativity simulations from the Simulating eXtreme Spacetimes catalog, IMRPhenomTEHM achieves lower than 2% unfaithfulness, confirming its accurate description without calibration to numerical relativity eccentric datasets. IMRPhenomTEHM provides a reliable description of the evolution of eccentric black hole binaries with aligned spins and eccentricities lower than $e=0.4$ at a frequency of 10 Hz, making it suitable for upcoming gravitational-wave observing runs. We validate the model's accuracy through parameter estimation studies, recovering injected parameters within 90% credible intervals for three numerical relativity eccentric simulations and reanalyzing GW150914 and GW190521, obtaining results consistent with the literature.

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Maria de Lluc Planas, Antoni Ramos-Buades, Cecilio García-Quirós, Héctor Estellés, Sascha Husa, Maria Haney. 2025-03-17. Time-domain phenomenological multipolar waveforms for aligned-spin binary black holes in elliptical orbits. https://doi.org/10.1103/wz3v-b151

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