Planets of 0.8 Earth radii and larger retain atmospheres over multi-gigayear timescales in the habitable zone under default stagnant-lid conditions, while smaller ones lose them, with initial carbon inventory as the dominant control.
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Arid terrestrial planets with less than roughly 20-50% of Earth's ocean water mass cannot sustain a balanced carbon cycle, leading to runaway CO2 buildup and uninhabitable conditions even inside the habitable zone.
citing papers explorer
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Smaller Than Earth Habitability Model (STEHM): The Lower Size Limit for Atmosphere Retention in the Habitable Zone
Planets of 0.8 Earth radii and larger retain atmospheres over multi-gigayear timescales in the habitable zone under default stagnant-lid conditions, while smaller ones lose them, with initial carbon inventory as the dominant control.
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Carbon Cycle Imbalances on Arid Terrestrial Planets with Implications for Venus
Arid terrestrial planets with less than roughly 20-50% of Earth's ocean water mass cannot sustain a balanced carbon cycle, leading to runaway CO2 buildup and uninhabitable conditions even inside the habitable zone.