Resonant Trapping of Stars by Merging Massive Black Hole Binaries

Details Resonant Trapping of Stars by Merging Massive Black Hole Binaries Resonant Trapping of Stars by Merging Massive Black Hole Binaries

2011-05-10

arxiv.org/abs/1105.1845v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 6 figures, to appear in MNRAS

Scientific paper

A massive black hole binary might resonantly trap a star (e.g. a white dwarf) and the gas released by its tidal disruption might emit electromagnetic wave signals around the coalescence of the binary. With post-Newtonian equations of motion including gravitational radiation reaction, we numerically studied resonant trappings by black hole binaries with mass ratio 1/100. It is found that 2:1 (and simultaneously 4:2) mean motion resonances of the binaries would be strong and could, in principle, draw small third objects deep into relativistic regimes (e.g. ~10 Schwarzschild radii). The inclinations of the trapped objects could increase significantly and, in some cases, retrograde orbits could be realized eventually.

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