How do scientists categorize the HZ region that accounts for potential subsurface oceans or significant greenhouse effects?

Answer

The Optimistic HZ

The Optimistic HZ is a wider region that includes areas where life might be sustained through significant greenhouse warming or where subsurface oceans could exist, in contrast to the more stringent Conservative HZ.

How do scientists categorize the HZ region that accounts for potential subsurface oceans or significant greenhouse effects?
Spaceastronomyhabitable zoneGoldilocks