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• W3000652511 startingPage "L114" @default.
• W3000652511 abstract "We study the dynamical evolution of eccentric massive black hole binaries (MBHBs) interacting with unbound stars by means of an extensive set of three body scattering experiments. Compared to previous studies, we extend the investigation down to a MBHB mass ratio of $q=m_2/m_1=10^{-4}$, where $m_1$ and $m_2$ are the masses of the primary and secondary hole respectively. Contrary to a simple extrapolation from higher mass ratios, we find that for $qlesssim 10^{-3}$ the eccentricity growth rate becomes negative, i.e., the binary {it circularises} as it shrinks. This behaviour is due to the subset of interacting stars captured in metastable counter-rotating orbits; those stars tend to extract angular momentum from the binary, promoting eccentricity growth for $q>10^{-3}$, but tend to inject angular momentum into the binary driving it towards circularisation for $q<10^{-3}$. The physical origin of this behaviour requires a detailed study of the orbits of this subset of stars and is currently under investigation. Our findings might have important consequences for intermediate MBHs (IMBHs) inspiralling onto MBHs (e.g. a putative $10^3rm M_{odot}$ black hole inspiralling onto SgrA$^*$)." @default.
• W3000652511 created "2020-01-23" @default.
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• W3000652511 date "2020-02-05" @default.
• W3000652511 modified "2023-10-05" @default.
• W3000652511 title "On the eccentricity evolution of massive black hole binaries in stellar backgrounds" @default.
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• W3000652511 doi "https://doi.org/10.1093/mnrasl/slaa018" @default.
• W3000652511 hasPublicationYear "2020" @default.
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