Other
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997abos.conf..351j&link_type=abstract
Conference Paper, Astronomical and Biochemical Origins and the Search for Life in the Universe, IAU Colloquium 161, Publisher: B
Other
2
Planetary Systems, Planetary Rotation, Space Habitats, Planetary Atmospheres, Water, Extraterrestrial Life, Carbon Dioxide, Night, Earth (Planet)
Scientific paper
Planets within the habitable zones of M stars are likely to be synchronous rotators, i.e., one side is permanently illuminated while the other side is in perpetual darkness. For such planets to be habitable, horizontal atmospheric motions must be capable of transporting enough heat from the day side to the night side to prevent the atmosphere from freezing out. Simple calculations have shown that the equivalent of approximately 150 mb of CO2 is required to prevent atmospheric condensation on the dark side. We now use a 3D global circulation model in order to better assess the ability of these planets to sustain an atmosphere. The results of this work show that for an Earth-sized planet, 100 mb of CO2 is required to support an atmosphere, while 1-2 bars are sufficient to allow liquid water everywhere. Planetary systems associated with M stars should therefore not be ruled out in the search for life in the universe.
Haberle Robert M.
Joshi Manoj M.
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