An equal-mass binary embedded in a circumbinary disk keeps migrating inward for disk thickness h/r above roughly 0.2, because the eccentric cavity instability never develops.
Specifically, T20 and DR22
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Instability and Angular Momentum Transfer in Thick Circumbinary Disks
An equal-mass binary embedded in a circumbinary disk keeps migrating inward for disk thickness h/r above roughly 0.2, because the eccentric cavity instability never develops.