Ok, this is a very amature question, but I am not trolling but please explain things in simple terms.
Jupiter does not have the critical size to become a star, even a
brown dwarf. However, once the Sun reaches the end of its life, it will most likely go into a red giant phase, ejecting a significant amount of matter into space (aka planetary nebula), beyond the orbits of earth and Mars.
Therefore, would it be possible for Jupipter's gravitational pull to absorb much of the ejected matter from the Sun (and matter from the inner planets), and, over time, evovle into a protostar or even a brown darwf?
Please, as stated above, I am looking for simple explanations (if that's possible).
Bo