摘要：AbstractIn this note we discuss the main results of a study of a massive binary with unequal mass ratio,q, embedded in an accretion disk, with its orbital rotation being opposed to that of the disk. When the mass ratio is sufficiently large, a gap opens in the disk, but the mechanism of gap formation is very different from the prograde case. Inward migration occurs on a timescale oftev~Mp/Ṁ, whereMpis the mass of the less massive component (the perturber), andṀis the accretion rate. Whenq≪ 1, the accretion takes place mostly onto the more massive component, with the accretion rate onto the perturber being smaller than, or of order of,q1/3Ṁ. However, this rate increases when supermassive binary black holes are considered and gravitational wave emission is important. We estimate a typical duration of time for which the accretion onto the perturber and gravitational waves could be detected.
关键词：Keywordsaccretion disksbinarieshydrodynamicsgalaxies: quasars: supermassive black holesplanet-disk interactions
