Rotational Brownian Motion of a Massive Binary

Details Rotational Brownian Motion of a Massive Binary Rotational Brownian Motion of a Massive Binary

2001-07-30

arxiv.org/abs/astro-ph/0107569v2

Astrophys.J. 568 (2002) 998

Astronomy and Astrophysics

Astrophysics

16 pages, 3 postscript figures. Accepted for publication in The Astrophysical Journal, vol. 568, 2002

Scientific paper

10.1086/339035

The orientation of a massive binary undergoes a random walk due to gravitational encounters with field stars. The rotational diffusion coefficient for a circular-orbit binary is derived via scattering experiments. The binary is shown to reorient itself by an angle of order (m/M)^1/2 during the time that its semi-major axis shrinks appreciably, where M is the binary mass and m the perturber mass. Implications for the orientations of rotating black holes are discussed.

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