Table 1.
Main properties of four-body models.
| Model | σc | ftri, end | fBBH | Ntri | fhie | funs | foctu | fstab + oct |
|---|---|---|---|---|---|---|---|---|
| (km s−1) | (%) | (%) | (%) | (%) | (%) | (%) | ||
| MOCC | 6.5 | 31.2 | 69 | 736 | 58 | 30 | 72 | 28 |
| BIN0 | 5 | 22.2 | 76.6 | 547 | 49 | 34 | 69 | 31 |
| BIN1 | 10 | 20.4 | 80.6 | 369 | 53 | 37 | 68 | 32 |
| BIN2 | 15 | 21.4 | 83.8 | 640 | 43 | 39 | 66 | 34 |
Notes. Column 1: model name. The first model refers to the set of simulations inferred from the MOCCA binary–binary scattering database. Column 2: cluster velocity dispersion. Column 3: percentage of models in which the end state is a triple (normalised to Nsim). Column 4: percentage of models in which the end state is at least one BBH with merger time below 14 Gyr, smaller than both the evaporation time and its initial value. Column 5: number of triples (temporary and end state) formed Ntri. Column 6: percentage of triples with a ratio between outer binary pericentre and inner binary semiaxis of larger than 10 (normalised to Ntri). Column 7: percentage of triples that are unstable, i.e. Mardling & Aarseth (2001) criterion not fulfilled. Column 8: percentage of systems for which secular effects can develop, i.e. having the octupole parameter ϵ < 0.1. Column 9: percentage of systems that both satisfy the stability criterion a3/a < K and have ϵ < 0.1.
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