A Classifying Milky Way planets by what they´re bound to and originate from

[snorkack]

TL;DR Summary

Relative numbers of various groups

How many planets now in Milky Way are:

1. Bound to a particular star or a star system of a few stars?
2. Not bound to any particular star nor a star system of a few stars but bound to Milky Way and possibly to some star system of many stars?
3. Not bound to Milky Way, but originating in Milky Way, recently accelerated to unbound and on the way out?
4. Not bound to Milky Way nor originating here, expelled from another galaxy and currently passing through Milky Way?

 

[russ_watters]

Of what we have detected:
1. All of them.
2, 3, 4. None of them.

This is because our detection methods are based on the planet's interaction with its host star.

 

[renormalize]

This is because our detection methods are based on the planet's interaction with its host star.

Not true. See https://en.wikipedia.org/wiki/Rogue_planet:
"The two first discovery papers use the names isolated planetary-mass objects (iPMO)[9] and free-floating planets (FFP).[10] Most astronomical papers use one of these terms.[11][12][13] The term rogue planet is more often used for microlensing studies, which also often uses the term FFP.[14][15] A press release intended for the public might use an alternative name. The discovery of at least 70 FFPs in 2021, for example, used the terms rogue planet,[16] starless planet,[17] wandering planet[18] and free-floating planet[19] in different press releases."

 

[DaveC426913]

So:
1. 5,876
2. ~70 > n < 100+
3. 0
4. 0