2023
DOI: 10.3847/1538-4357/ace4c1
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On the Likely Dynamical Origin of GW191109 and Binary Black Hole Mergers with Negative Effective Spin

Rachel C. Zhang,
Giacomo Fragione,
Chase Kimball
et al.

Abstract: With the growing number of binary black hole (BBH) mergers detected by LIGO/Virgo/KAGRA, several systems have become difficult to explain via isolated binary evolution, having components in the pair-instability mass gap, high orbital eccentricities, and/or spin–orbit misalignment. Here we focus on GW191109_010717, a BBH merger with component masses of 65 … Show more

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Cited by 7 publications
(3 citation statements)
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“…Unequivocal detections of a hierarchical BBH merger via GW observations will help understand the formation channels and histories of such systems. While studies often focus on identifying a hierarchical merger from antialigned spins (see, e.g., Fishbach et al 2022;Zhang et al 2023), we have focused on both the measurement of spin-precession in addition to antialignment in a simulated BBH merger population from realistic cluster models (Rodriguez et al 2022). From this study, the key insights are as follows:…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Unequivocal detections of a hierarchical BBH merger via GW observations will help understand the formation channels and histories of such systems. While studies often focus on identifying a hierarchical merger from antialigned spins (see, e.g., Fishbach et al 2022;Zhang et al 2023), we have focused on both the measurement of spin-precession in addition to antialignment in a simulated BBH merger population from realistic cluster models (Rodriguez et al 2022). From this study, the key insights are as follows:…”
Section: Discussionmentioning
confidence: 99%
“…While a positive χ eff is possible, such systems may not be distinguishable from other formation channels whereas spin antialignment is difficult to form in the field (Rodriguez et al 2016). Being a typically better-measured parameter (Ng et al 2018;Biscoveanu et al 2021), studies have focused on negative χ eff as a potential sign for a hierarchical merger event (e.g., Baibhav et al 2020;Fishbach et al 2022;Zhang et al 2023). However, due to the inherent isotropic spin orientation distribution that is expected for hierarchical mergers in most astrophysical environments, many more systems will have large in-plane spins as opposed to large spins antialigned with the orbital angular momentum.…”
Section: Introductionmentioning
confidence: 99%
“…For all models, we find significant support for negative values of χ eff , confirming the results in Refs. [14,289]. In the latter, the possibility of formation by dynamical capture for the binary generating this event is discussed.…”
Section: Gw191109_010717mentioning
confidence: 96%