  We propose and analyze a new mechanism for the formation of the wide
asynchronous binary population. These binary asteroids have wide semi-major
axes relative to most near-Earth and Main Belt asteroid systems. Confirmed
members have rapidly rotating primaries and satellites that are not tidally
locked. Previously suggested formation mechanisms from impact ejecta, planetary
flybys and directly from rotational fission events cannot satisfy all of the
observations. The newly hypothesized mechanism works as follows: (i) these
systems are formed from rotational fission, (ii) their satellites are tidally
locked, (iii) their orbits are expanded by the BYORP effect, (iv) their
satellites de-synchronize due to the adiabatic invariance between the libration
of the secondary and the mutual orbit, and (v) the secondary avoids
resynchronization due to the the YORP effect. This seemingly complex chain of
events is a natural pathway for binaries with satellites that have particular
shapes, which define the BYORP effect torque that acts on the system. After
detailing the theory, we analyze each of the wide asynchronous binary members
and candidates to assess their most likely formation mechanism. Finally, we
suggest possible future observations to check and constrain our hypothesis.
