Physics
Scientific paper
Oct 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1556t&link_type=abstract
EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1556
Physics
Scientific paper
We use a general circulation model (GCM) to study the three-dimensional atmospheric flow and temperature structures of extrasolar planets on tidally synchronised orbits. We have performed an extensive exploration of the physical and numerical parameter space relevant for tidally synchronised giant planets, in idealised scenarios, using HD209458b as a reference planet. Here we focus on effects of applied thermal forcing, and the interplay between the forcing and numerical parameters, such as the strength of artificial viscosity. This is particularly crucial when the models are stressed in the limit of strong forcing, as is common in extrasolar planet studies. We show that commonly used forcing (a large range of cooling times, including very short ones) leads to unphysical (overdissipated and/or noisy) results. We emphasise that a variety of flow and temperature states is possible, not only for different values of the forcing parameters, but also for a given set of parameters. However, robust features can be identified, including large-scale coherent vortices which strongly affect the temperature distribution.
Cho James Y-K.
Thrastarson Heidar Thor
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