Recent models of how stars are formed have emphasized in the strongest terms, that most stars are born in a litter with at least one companion. Our own star at the center of the solar system is no exception, and astronomers suspect that our sun's estranged twin may in fact be responsible for the sudden extinction of the dinosaurs.
In the year 2017 researchers from UC Berkeley and the Harvard Astrophysical observatory analyzed data from a radio survey of a dust cloud from the Perseus Constellation, and concluded that all sun like stars are most likely born with a companion.
A series of statistical models were run of both single stars and binaries in the Perseus molecular cloud, and the only model that could reproduce the data was the one in which all stars initially form as wide binaries.
For many years astronomers had speculated as to whether the binary system of stars in our galaxy were created close to one another, or came closer to one another after their formation. The born together hypotheses was the most reliable, and simulations in recent decades has shown that almost all stars are not born alone, but in pairs that often spin away on their own.