TY - JOUR
T1 - Effective spin distribution of black hole mergers in triples
AU - Fragione, Giacomo
AU - Kocsis, Bence
N1 - Funding Information:
GF thanks Seppo Mikkola for helpful discussions on the use of the code ARCHAIN, and Barak Zackay for providing data on the effective spins of binary BH mergers. We thank Fabio Antonini for useful discussions. GF acknowledges support from a CIERA postdoctoral fellowship at Northwestern University. This work received funding from the European Research Council (ERC) under the European Union's Horizon 2020 Programme for Research and Innovation ERC-2014-STG under grant agreement No. 638435 (GalNUC) and from the Hungarian National Research, Development, and Innovation Office under grant NKFIH KH-125675 (to BK). This research was supported in part by the National Science Foundation under Grant No. NSF PHY-1748958.
Funding Information:
GF thanks Seppo Mikkola for helpful discussions on the use of the code ARCHAIN, and Barak Zackay for providing data on the effective spins of binary BH mergers. We thank Fabio Antonini for useful discussions. GF acknowledges support from a CIERA postdoctoral fellowship at Northwestern University. This work received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 Programme for Research and Innovation ERC-2014-STG under grant agreement No. 638435 (GalNUC) and from the Hungarian National Research, Development, and Innovation Office under grant NKFIH KH-125675 (to BK). This research was supported in part by the National Science Foundation under Grant No. NSF PHY-1748958.
Publisher Copyright:
© 2020 The Author(s).
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Many astrophysical scenarios have been proposed to explain the several black hole (BH) and neutron star binary mergers observed via gravitational waves (GWs) by the LIGO-Virgo collaboration. Contributions from various channels can be statistically disentangled by mass, spin, eccentricity, and redshift distributions of merging binaries. In this paper,we investigate the signatures of BH-BH binary mergers induced by a third companion through the Lidov-Kozai mechanism in triple systems. We adopt different prescriptions for the supernovae natal kicks and consider different progenitor metallicities and initial orbital parameters. We show that the typical eccentricity in the LIGO band is 0.01-0.1 and that the merger rate is in the range 0.008-9Gpc-3 yr-1, depending on the natal kick prescriptions and progenitor metallicity. Furthermore, we find that the typical distribution of effective projected spin is peaked at Xeff ~ 0 with significant tails. We show that the triple scenario could reproduce the distribution of Xeff. We find that the triple channel may be strongly constrained by the misalignment angle between the binary component spins in future detections with spin precession.
AB - Many astrophysical scenarios have been proposed to explain the several black hole (BH) and neutron star binary mergers observed via gravitational waves (GWs) by the LIGO-Virgo collaboration. Contributions from various channels can be statistically disentangled by mass, spin, eccentricity, and redshift distributions of merging binaries. In this paper,we investigate the signatures of BH-BH binary mergers induced by a third companion through the Lidov-Kozai mechanism in triple systems. We adopt different prescriptions for the supernovae natal kicks and consider different progenitor metallicities and initial orbital parameters. We show that the typical eccentricity in the LIGO band is 0.01-0.1 and that the merger rate is in the range 0.008-9Gpc-3 yr-1, depending on the natal kick prescriptions and progenitor metallicity. Furthermore, we find that the typical distribution of effective projected spin is peaked at Xeff ~ 0 with significant tails. We show that the triple scenario could reproduce the distribution of Xeff. We find that the triple channel may be strongly constrained by the misalignment angle between the binary component spins in future detections with spin precession.
KW - Black hole physics
KW - Galaxies: kinematics and dynamics
KW - Galaxy: kinematics and dynamics
KW - Stars: kinematics and dynamics
KW - Stars: neutron
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U2 - 10.1093/mnras/staa443
DO - 10.1093/mnras/staa443
M3 - Article
AN - SCOPUS:85085392194
VL - 493
SP - 3920
EP - 3931
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -