Angular momenta of collided rarefied preplanetesimals
  The angular momenta of rarefied preplanetesimals needed for formation of small-body binaries can be obtained at collisions of preplanetesimals. Trans-Neptunian objects, including trans-Neptunian binaries, could be formed from contracting rarefied preplanetesimals. 
Sergei I. Ipatov
astro-ph.EP