On the Likely Dynamical Origin of GW191109 and Binary Black Hole Mergers with Negative Effective Spin

被引：14

作者：

Zhang, Rachel C. C. ^{[1
,2
]}

Fragione, Giacomo ^{[1
,2
]}

Kimball, Chase ^{[1
,2
]}

Kalogera, Vicky ^{[1
,2
]}

机构：

[1] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[2] Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CIE, Evanston, IL 60208 USA

来源：

ASTROPHYSICAL JOURNAL | 2023年 / 954卷 / 01期

关键词：

DENSE STAR-CLUSTERS; GRAVITATIONAL-WAVE GENERATION; PULSATIONAL PAIR-INSTABILITY; COMPACT-OBJECT BINARIES; MASS-RATIO DISTRIBUTION; OPEN STELLAR CLUSTERS; X-RAY BINARIES; NEUTRON-STAR; ASYMMETRIC SUPERNOVA; COMMON ENVELOPE;

D O I：

10.3847/1538-4357/ace4c1

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 (+11)(-11) and 47 (-13) (+15) M-circle dot and an effective spin of -0.290(-31)(+0.42), which could imply a spin-orbit misalignment of more than pi/2 rad for at least one of its components. Besides its component masses being in the pair-instability mass gap, we show that isolated binary evolution is unlikely to reproduce the proposed spin-orbit misalignment of GW191109 with high confidence. On the other hand, we demonstrate that BBHs dynamically assembled in dense star clusters would naturally reproduce the spin-orbit misalignment and masses of GW191109 and the rates of GW191109-like events if at least one of the components were to be a second-generation BH. Finally, we generalize our results to all events with a measured negative effective spin, arguing that GW200225 also has a likely dynamical origin.

引用

页数：9

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