I'm curious about the force/event before it got to our solar system. If the original object was protoplanetary, what kind of forces would be required to knock a

I'm curious about the force/event before it got to our solar system. If the original object was protoplanetary, what kind of forces would be required to knock an object of this current size out of a stars gravitational hold, and into interstellar space? I'm guessing we can assume that due to the current size of this object, it would have had to have been part of a much larger event.