Mathematics – Logic
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.1405k&link_type=abstract
American Astronomical Society, ESS meeting #2, #14.05
Mathematics
Logic
Scientific paper
Of the 500 extrasolar planets detected, over half of these are on non-circular orbits, with eccentricities as high as 0.97. Such planets experience highly time-variable heating that greatly affects their overall temperature structure and atmospheric circulation. A number of these eccentric planets transit their host stars (e.g. HD80606b, GJ436b, HAT-P-2b), allowing us to probe their atmospheres from transit to secondary eclipse. However, extracting planetary information from the data can be challenging, as the convolution of spatial effects (hot spots rotating into/out of view) and temporal effects (planet getting colder/warmer at apoapse/periapse) can complicate its interpretation. Hence, a comprehensive study that establishes the dynamical regime, temperature structure, and observational implications of this unique class of planets is crucial. Therefore, we present results from our systematic study of generic hot Jupiters on highly eccentric orbits (e=0.0-0.75) using the SPARC/MITgcm, a model that couples a state-of-the-art general circulation model, the MITgcm, with a plane-parallel, two-stream, multi-band radiative transfer model. In this study, we compare pseudo-synchronously rotating eccentric planets to those on circular orbits with equal average stellar flux. This direct comparison serves to disentangle the heating effects due to circulation from those due to varying orbital position. In previous presentations, we have shown that the simulations possess a superrotating equatorial jet that is maintained throughout the planet’s orbit. As the planet’s eccentricity is increased, the equatorial jet narrows, and symmetric high latitude jets develop. We expand on this previous work by determining their observational implications. For each simulation, we will present synthetic full-orbit light curves to determine the extent to which the meteorological wind structure, day-night temperature differences, and temporal changes in temperature can be extracted from the data. This is a vital step to understanding what current and upcoming lightcurve data can say about the physical nature of planets on eccentric orbits.
Fortney Jonathan J.
Freedman Richard Stuart
Kataria Tiffany
Lewis Nikole K.
Marley Mark S.
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