"ESIGMA" - An aligned-spin eccentric IMR waveform model for compact binary mergers

The network of LIGO-Virgo observatories have detected more than a hundred compact binary mergers in their three observing runs. While most binaries tend to circularize when they enter the LIGO-Virgo frequency band, a subpopulation that forms via dynamical interactions in dense stellar clusters can have measurable residual eccentricities. As the size of the gravitational-wave signal catalog grows with increasing detector sensitivity, we are likely to start seeing many of such eccentric merger events. It is therefore timely to develop waveform models that will allow us to accurately characterize and study them. In this talk, we present ESIGMA, an eccentric, aligned-spin, time-domain, inspiral-merger-ringdown (IMR) waveform model for compact binary mergers that includes sub-dominant gravitational-wave harmonics. ESIGMA extends the ENIGMA framework of Huerta et al (2017) by incorporating up-to-date spinning eccentric post-Newtonian results available in literature, and replacing the merger-ringdown prescription with a numerical relativity based surrogate model. We show that ESIGMA has excellent agreement with aligned-spin eccentric numerical relativity simulations. This model will help us understand the astrophysical origins of compact binaries in the ongoing and upcoming observing runs of gravitational wave detectors.