How extreme can a habitable tidaly locked world be?

I want to create a tidally locked world with a habitable (broadly Earth like atmosphere and biome that humans could breathe and live in) band stretching around the terminator pole to pole. There would then be a hot hemisphere sunward and a cold hemisphere on the dark side.

I would like to give this world an extreme temperature gradient from the hot side to the cold side to enable the inhabitants to slowly explore further and further into each hemisphere as their technology advances.

So how extreme can the temperature difference be before the habitable band becomes uninhabitable and what ultimately causes it to become uninhabitable?

Bonus I would like to have some liquid water in the habitable zone and liquid oxygen/nitrogen pools and or solid CO2 ice on the dark side but I am warry that if conditions were such that they could form they might accumulate out of control and consume the atmosphere. How can this be prevented?

This question is similar to this one: How extensive could a habitable twilight zone be on a tidally locked planet? except I am looking to see how to maximise the temperature difference whilst maintaining habitability and the mechanisms that could help achieve this.

posted about 4 years ago

Slarty‭

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