The Atmospheres of Synchronously Rotating Planets

Details The Atmospheres of Synchronously Rotating Planets The Atmospheres of Synchronously Rotating Planets

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.1218j&link_type=abstract

American Astronomical Society, DPS meeting #28, #12.18; Bulletin of the American Astronomical Society, Vol. 28, p.1114

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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 always in darkness. On such planets, 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. We show using a 3-dimensional global circulation model that 100 mb of CO2 is sufficient to support an atmosphere, while 1-2 bars are sufficient to allow liquid water everywhere. Because of the slow rotation rate of these planets, their global circulation is similar to Venus or Titan, with a superrotating jet present above the equator, and two Hadley cells extending almost to the poles. Strong longitudinal thermally direct cells also exist in the tropics, transferring heat from the day to the night side. These results show that M-type stars should not be ruled out in the search for habitable planets

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