Althea Moorhead: Research

My thesis research is devoted to understanding solar system dynamics with circumstellar disks present. We have found that simplified disk torques combined with planet-planet scattering are capable of reproducing the observed range in exoplanet orbital eccentricities and semi-major axes (Paper I.) However, our understanding of exactly how a circumstellar disk affects orbital eccentricity is limited by our understanding of the degree to which corotation torques are saturated in the disk (Paper II.)

Currently, I am investigating how the inclusion of MHD turbulence in the disk changes our predictions of orbital element distributions for the extrasolar planets.

Simultaneously, I am investigating the likelihood that terrestrial planets exist in mean motion resonances with gas giants in extrasolar planetary systems. Such configurations are potentially detectable through transit timing variations.

Tools (External Links)

    

References

MA05:   Giant planet migration through the action of disk torques and planet-planet scattering, (A. V. Moorhead and F. C. Adams), Icarus 178, 517-539 (2005).

MA08:   Eccentricity evolution of giant planet orbits due to circumstellar disk torques, (A. V. Moorhead and F. C. Adams), Icarus, accepted.