Cyborg IM1 wrote:
Size only goes to A (10000 mile diameter) but there are known exoplanets that are larger than that. So, if we simply expand it to B and C, we can cover them. The question I have on SIZE is does it realistically need to go higher than C (12000-13000 mile diameter)? At some point, it is going to become a small gas giant, so there should be a natural upper limit. BUT, if the world is located in the Inner Zone (inside the habitable zone), there will be essentially no volatiles and so forming a Gas Giant would be much harder, so a larger rocky world (or an exposed Gas Giant core) could exist (I think). While it is no big deal either way to me, I want to make sure I am accounting for all logically possible worlds, based on what we know today, but not add sizes that are really not possible.
If you're serious about this project, you should probably read up on the latest theories of planet formation. I've linked two useful review papers here
In this case, you should realize that giants (gas or ice) are not thought to form in the inner zone. They form out beyond the snow line and migrate in to the edge of the protoplanetary disk, potentially due to one of several possible mechanisms. Note also that stars get brighter as they age, so any "zones" move outward over time.
Really, the discovery of hot jupiters has rendered the whole concept of inner and outer zones somewhat moot. Habitability is also more difficult to define, in that the habitable zone derived from analytics isn't wide enough to account for the evidence of possible habitable conditions on Mars (and perhaps Venus, too, albeit even more briefly).