Hydrodynamical Simulations of Unevenly Irradiated Jovian Planets

Details Hydrodynamical Simulations of Unevenly Irradiated Jovian Planets Hydrodynamical Simulations of Unevenly Irradiated Jovian Planets

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21010604l&link_type=abstract

American Astronomical Society Meeting 210, #106.04; Bulletin of the American Astronomical Society, Vol. 39, p.232

Physics

Geophysics

Scientific paper

We discuss a series of two-dimensional hydrodynamical simulations which model the global time-dependent radiative responses and surface flow patterns of Jovian planets subject to strongly variable atmospheric irradiation. We treat the planetary atmosphere as a thin compressible fluid-layer subject to time-dependent radiative heating and cooling.We consider planets in several environments, including hot Jupiters on circular orbits, short-period planets on eccentric orbits such as HD 118203 b (in which libration effects are important), and planets on highly eccentric orbits. Particular attention is given to HD 80606 b, which has the highest known eccentricity (e=0.932) of any planet. Its orbital period is P=111.4d, and at periastron, it passes within 7 RSun of its parent star. As a result of spin pseudo-synchronization, the rotation period of the planet is expected to be 36.8 hours, allowing the initial conditions for the simulation to determined with confidence. We show that the atmospheric response during the periastron passage of HD 80606 b will likely be observable by the Spitzer Space telescope at all infrared bands. We show that photometric observations taken during periastron passage can determine the effective radiative time constant in the planet's atmosphere. We show that a direct measurement of the radiative time constant can be used to clarify interpretation of infrared observations of other short-period planets.
This research has been supported by the NSF through CAREER Grant AST-0449986, and by the NASA Planetary Geology and Geophysics Program through Grant NNG04GK19G.

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