Black Hole Mergers from Hierarchical Triples in Dense Star Clusters
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Black Hole Mergers from Hierarchical Triples in Dense Star Clusters. / Martinez, Miguel A. S.; Fragione, Giacomo; Kremer, Kyle; Chatterjee, Sourav; Rodriguez, Carl L.; Samsing, Johan; Ye, Claire S.; Weatherford, Newlin C.; Zevin, Michael; Naoz, Smadar; Rasio, Frederic A.
I: Astrophysical Journal, Bind 903, Nr. 1, 67, 01.11.2020.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Black Hole Mergers from Hierarchical Triples in Dense Star Clusters
AU - Martinez, Miguel A. S.
AU - Fragione, Giacomo
AU - Kremer, Kyle
AU - Chatterjee, Sourav
AU - Rodriguez, Carl L.
AU - Samsing, Johan
AU - Ye, Claire S.
AU - Weatherford, Newlin C.
AU - Zevin, Michael
AU - Naoz, Smadar
AU - Rasio, Frederic A.
PY - 2020/11/1
Y1 - 2020/11/1
N2 - Hierarchical triples are expected to be produced by the frequent binary-mediated interactions in the cores of globular clusters. In some of these triples, the tertiary companion can drive the inner binary to merger following large eccentricity oscillations, as a result of the eccentric Kozai-Lidov mechanism. In this paper, we study the dynamics and merger rates of black hole (BH) hierarchical triples, formed via binary-binary encounters in the CMC Cluster Catalog, a suite of cluster simulations with present-day properties representative of the Milky Way's globular clusters. We compare the properties of the mergers from triples to the other merger channels in dense star clusters, and show that triple systems do not produce significant differences in terms of mass and effective spin distribution. However, they represent an important pathway for forming eccentric mergers, which could be detected by LIGO-Virgo/Kamioka Gravitational-Wave Detector (LVK), and future missions such as LISA and the DECi-hertz Interferometer Gravitational wave Observatory. We derive a conservative lower limit for the merger rate from this channel of 0.35 Gpc(-3) yr(-1) in the local universe and up to similar to 9% of these events may have a detectable eccentricity at LVK design sensitivity. Additionally, we find that triple systems could play an important role in retaining second-generation BHs, which can later merge again in the core of the host cluster.
AB - Hierarchical triples are expected to be produced by the frequent binary-mediated interactions in the cores of globular clusters. In some of these triples, the tertiary companion can drive the inner binary to merger following large eccentricity oscillations, as a result of the eccentric Kozai-Lidov mechanism. In this paper, we study the dynamics and merger rates of black hole (BH) hierarchical triples, formed via binary-binary encounters in the CMC Cluster Catalog, a suite of cluster simulations with present-day properties representative of the Milky Way's globular clusters. We compare the properties of the mergers from triples to the other merger channels in dense star clusters, and show that triple systems do not produce significant differences in terms of mass and effective spin distribution. However, they represent an important pathway for forming eccentric mergers, which could be detected by LIGO-Virgo/Kamioka Gravitational-Wave Detector (LVK), and future missions such as LISA and the DECi-hertz Interferometer Gravitational wave Observatory. We derive a conservative lower limit for the merger rate from this channel of 0.35 Gpc(-3) yr(-1) in the local universe and up to similar to 9% of these events may have a detectable eccentricity at LVK design sensitivity. Additionally, we find that triple systems could play an important role in retaining second-generation BHs, which can later merge again in the core of the host cluster.
KW - Astrophysical black holes
KW - Black holes
KW - Stellar mass black holes
KW - Gravitational wave astronomy
KW - Gravitational wave detectors
KW - Gravitational wave sources
KW - Gravitational waves
KW - Globular star clusters
KW - Star clusters
KW - Trinary stars
KW - MONTE-CARLO SIMULATIONS
KW - GRAVITATIONAL-WAVE GENERATION
KW - KOZAI-LIDOV OSCILLATIONS
KW - OPEN STELLAR CLUSTERS
KW - GLOBULAR-CLUSTERS
KW - ALGORITHMIC REGULARIZATION
KW - CHAOTIC DYNAMICS
KW - BINARY-BINARY
KW - EVOLUTION
KW - MASS
U2 - 10.3847/1538-4357/abba25
DO - 10.3847/1538-4357/abba25
M3 - Journal article
VL - 903
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 67
ER -
ID: 251691114