[BenLurkin]

Dumb question: Did our sun ever have a companion star?

[Salman]

There has been speculation but nothing definitive.

https://www.bbc.com/future/article/20241223-the-search-for-the-suns-missing-twin

[Carl Vehse]

Dumb question: Did our sun ever have a companion star?

I don't think the Wayback Machine goes back that far.

Jupiter, the largest planet in our solar system, would need over ten times more mass to become a brown dwarf star and eighty times more mass to become a red dwarf star.

[ModelBreaker]

“Dumb question: Did our sun ever have a companion star?”

I don’t know. But ask Keith Richards. He might.