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Gaseous circumbinary disks (CBDs) that are highly inclined to the binaryorbit are commonly observed in nature. These disks harbor particles that canreach large mutual inclinations as a result of nodal precession once the gasdisk has dissipated. With n-body simulations that include fragmentation wedemonstrate that misaligned disks of particles can be efficient progenitors ofinterstellar asteroids (ISAs). Collisions that take place between particleswith large mutual inclinations have large impact velocities which can result inmass ejection, with a wide range of fragment sizes and ejection velocities. Weexplore the binary parameters for which the majority of the terrestrial planetforming material is ejected rather than accreted into planets. The misalignmentrequired to eject significant material decreases with binary eccentricity. Ifthe distribution of binary eccentricity is uniform and the initial particle CBDorientation relative to the binary orbit is isotropic, about 59% of binariesare more likely to eject the majority of their CBD terrestrial planet disk massthrough high velocity body-body collisions rather than retain this material andbuild terrestrial planets. However, binary--disk interactions during the gasdisk phase with non-zero disk viscosity will reduce this fraction. Thecomposition, small size, highly elongated shape, and tumbling motion of`Oumuamua is consistent with ISAs generated by misaligned CBDs.

Misaligned circumbinary disks as efficient progenitors of interstellar asteroids