There may be a lot of them. I think that this is a good example of how little we know about planet formation.
Some possibilities that quickly come to mind:
1. The planet formed elsewhere, was ejected and was later captured by the binary system.
2. The planet formed around a single star that later became part of a binary system.
3. Somehow, the planet formed in a binary system.
It really isn’t surprising that such planets could form, but getting one to have a stable climate for the formation of life is questionable.
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