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GJ436b is a unique member of the transiting extrasolar planet populationbeing one of the smallest and least irradiated and possessing an eccentricorbit. Because of its size, mass and density, GJ436b could plausibly have anatmospheric metallicity similar to Neptune (20-60 times solar abundances),which makes it an ideal target to study the effects of atmospheric metallicityon dynamics and radiative transfer in an extrasolar planetary atmosphere. Wepresent three-dimensional atmospheric circulation models that include realisticnon-gray radiative transfer for 1, 3, 10, 30, and 50 times solar atmosphericmetallicity cases of GJ436b. Low metallicity models (1 and 3 times solar) showlittle day/night temperature variation and strong high-latitude jets. Incontrast, higher metallicity models (30 and 50 times solar) exhibit day/nighttemperature variations and a strong equatorial jet. Spectra and light curvesproduced from these simulations show strong orbital phase dependencies in the50 times solar case and negligible variations with orbital phase in the 1 timessolar case. Comparisons between the predicted planet/star flux ratio from thesemodels and current secondary eclipse measurements support a high metallicityatmosphere (30-50 times solar abundances) with disequilibrium carbon chemistryat play for GJ436b. Regardless of the actual atmospheric composition of GJ436b,our models serve to illuminate how metallicity influences the atmosphericcirculation for a broad range of warm extrasolar planets.

Atmospheric Circulation of Eccentric Hot Neptune GJ436b