We present a comprehensive Bayesian statistical analysis of brown dwarf companions to investigate the physical mechanisms responsible for the observed “brown dwarf desert’’ — the notable paucity of brown dwarf companions at orbital separations 5 AU), a constraint successfully reproduced only by the migration model. Our results provide quantitative evidence that brown dwarfs form at wide separations (10—30 AU) through disk fragmentation and undergo limited Type II migration to reach observed close-in locations, with migration naturally halting near 1 AU through gap-opening processes.
Behrooz Karamiqucham (Tue,) studied this question.