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" ... All stars form from fast-spinning dense protostellar molecular clouds --- usually found in dense star-forming regions like the nearby Orion Nebula. In such clouds, normally, single stars form from fragmentation of dense stellar cloud cores. However, Mason says that about a third of the time, faster-spinning molecular clouds collapse and fragment into two protostellar pieces. It’s thought that circumbinary stars form from this smaller subset of fast-spinning, star-forming clouds. ... "
" ... It’s not precisely known why binary star systems form, but astronomers have a basic understanding of how. “The gas clouds out of which stars form are often unstable and susceptible to gravitational fragmentation,” said El-Badry, who will move to Boston in the fall to start as a postdoctoral researcher at Harvard. “If a gas cloud or protostellar disk fragments into two as it collapses under its own gravity, the two fragments can each become a star.” ... "