I'm trying to construct a habitable world which has a sun orbiting around it. I know a star can't orbit around a planet, because a star is much more massive than a single planet, which has been known here:
Can a habitable planet have mini-suns (i.e. solar satellites or glowing moons)?
But how about a star orbiting around MULTIPLE planets? For example:
There is a multiple plantary system, which contains several planets without a sun, but they are very massive so that their total mass exceeds the lower mass limit of star
Later, a very small star (just reached lower mass limit of star) is captured by the whole system above, which starts orbiting around the whole system
Is that possible?