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I thought of something that may also be a factor and and why there are so many Binary or Trinary stars out there.
Most of the Exoplanets that have been discovered a very large Jupiter sized or larger and are also orbiting very close to their companion star.
A Brown dwarf is the star that didn't ignite and they are also around about the size of Jupiter or maybe a bit more. It may be possible that these gas giants found around the stars are the start of a possible binary star that just didn't have enough gravitational forces to ignite the centre of the planet's into nuclear fusion. As you can imagine Jupiter is an extremely hot planet with its own power source. So it is quite possible that when a a star explodes and leaves loads of hydrogen gas behind that the first thing that is accumulated is hydrogen gas to form a large gas giants. some of these gas giants may be big enough to start nuclear fusion and thus creates a binary star, others to simply failed to start.
Just an idea but would need a lot of data to be collected to at least start confirmation.
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