Statistics – Computation
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p42b..08g&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P42B-08
Statistics
Computation
[0545] Computational Geophysics / Modeling, [3621] Mineralogy And Petrology / Mantle Processes, [5400] Planetary Sciences: Solid Surface Planets
Scientific paper
Exoplanet detection techniques, such as radial velocity and transit searches, tend to favor the discovery of short-period planets. These planets are close enough to the host star to develop tidally-locked orbits. Previous workers have modeled the effect of tidal locking on magnetospheres and global climate patterns. Here we investigate the effect of synchronous rotation on the mantle convective structure of various sized Earth-like planets. We use a spherical axisymmetric version of the finite element code ConMan called SSAXC, with boundary conditions that accept radiative heat from the star and in turn radiate as a black body. We identify three punctuating evolutionary regimes in Earth-like models: (1) a series of downwellings initially form at the substellar point, antistellar point, and at the terminator; (2) after ˜250,000 years, lithospheric instabilities induce pervasive small-scale convective cells; (3) after ˜3.5 billion years, a cool sink forms at the antistellar point, eventually spanning the depth of the mantle and forming a pseudo-Mode 1 convective pattern. We apply these models to planets receiving higher stellar fluxes, with a specific focus on the Gliese 581 system. These results are particularly significant for understanding the potential habitability of tidally-locked Super-Earths.
Elkins-Tanton Linda T.
Gelman S. E.
Seager Sara
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