There’s no way (I know of) they could tell those planets weren’t captured and then spiraled in toward the star.
The size of Jupiter and orbits every seven DAYS ?
It’s got to be close! A lot of gravitational
crap happening there.
Jeez over there besides being squished I would
be 2730 years old.
Or that one was, one wasn't. I don't think there is a limit to the ways things can happen, or do happen, out 'there'. I think that every possibility actually occurs, somewhere, sometime. Instead of stating (with no actual evidence) that something cannot happen, I prefer to be amazed by what we find out can happen.
: )