Minimally-modeled search of higher multipole gravitational-wave radiation in compact binary coalescences

As the Advanced LIGO and Virgo interferometers, soon to be joined by KAGRA interferometer, increase their sensitivity, they detect an ever-larger number of gravitational waves with a significant presence higher multipoles in addition dominant $(2, 2)$ multipole. These can detected different approaches, such as minimally-modeled burst search methods, here we discuss one approach based on coherent WaveBurst pipeline (cWB). During inspiral phase produce chirps whose instantaneous frequency is multiple (2, 2) multipole, describe how cWB used these spectral features. The performed within suitable regions time-frequency representation; shape determined optimizing Receiver Operating Characteristics. This novel method has already been GW190814 discovery paper (Astrophys. J. Lett. 896 L44) very fast flexible. Here full detail procedure (3,3) multipole well searches for other during phase, apply it another event that displays multipoles, GW190412, replicating results obtained methods. described analysis support findings model-based Bayesian parameter estimates