675 citations · 1k across the 4 of their papers we have counts for
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Could Cirrus Clouds Have Warmed Early Mars?
Ramses M. Ramirez, James F. Kasting
The presence of the ancient valley networks on Mars indicates that the climate at 3.8 Ga was warm enough to allow substantial liquid water to flow on the martian surface for extend…
Warming early Mars with CO2 and H2
Ramses M. Ramirez, Ravi Kopparapu, Michael E. Zugger +3
The presence of valleys on ancient terrains of Mars suggest that liquid water flowed on the martian surface 3.8 billion years ago or before. The above-freezing temperatures require…
Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
Ravi kumar Kopparapu, Ramses M. Ramirez, James SchottelKotte +3
The ongoing discoveries of extrasolar planets are unveiling a wide range of terrestrial mass (size) planets around their host stars. In this letter, we present estimates of habitab…