Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19712805l&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #128.05; Bulletin of the American Astronomical Society, Vol. 33, p.711
Astronomy and Astrophysics
Astronomy
Scientific paper
We apply a maximum entropy principle developed for the Earth's climate to predict day-night temperature contrasts for planets very close to their parent stars. Terrestrial (rocky) planets in orbit around M dwarfs must be so close to these under-luminous stars that tidal locking (synchronous rotation) is obtained. We find, in agreement with published GCM simulations, temperature contrasts modest enough to maintain liquid water on such planets. However, in contrast to the GCM results we predict a very weak (formally, no) dependence of the temperature contrast on planetary (synchronous) rotation rate. For extra-solar giant planets orbiting around stars of a variety of spectral types, we predict day-night temperature contrasts of order hundreds of degrees Kelvin. This work is supported by NASA's Atmospheres and Origins Programs
Lorenz Robert
Lunine Jonathan
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