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# Searching for candidates of coalescing binary black holes formed through chemically homogeneous evolution in GWTC-3

...+9
Nov 2022

The LIGO, Virgo, and KAGRA (LVK) collaboration has announced 90 coalescingbinary black holes (BBHs) with $p_{\rm astro} > 50\%$ to date, however, theorigin of their formation channels is still an open scientific question. Givenvarious properties of BBHs (BH component masses and individual spins) inferredusing the default priors by the LVK, independent groups have been trying toexplain the formation of the BBHs with different formation channels. Of allformation scenarios, the chemically homogeneous evolution (CHE) channel hasstood out with distinguishing features, namely, nearly-equal component massesand preferentially high individual spins aligned with the orbital angularmomentum. We perform Bayesian inference on the BBH events officially reportedin GWTC-3 with astrophysically-predicted priors representing differentformation channels of the isolated binary evolution (CEE: common-envelopeevolution channel; CHE; SMT: stable mass transfer). Given assumed models, wereport strong evidence for GW190517\_055101 being most likely to have formedthrough the CHE channel. Assuming the BBH events in the subsample are allformed through one of the isolated binary evolution channels, we obtain thelower limits on the local merger rate density of these channels at $11.45~\mathrm{Gpc^{-3}~yr^{-1}}$ (CEE), $0.18 ~\mathrm{Gpc^{-3}~yr^{-1}}$ (CHE), and$0.63 ~\mathrm{Gpc^{-3}~yr^{-1}}$ (SMT) at $90\%$ credible level.

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