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William B. Hubbard
Ph.D., 1967, Berkeley Lunar and Planetary Lab University of Arizona Tucson AZ 85721 Kuiper Space Sciences 417 520.621.6942 E-mail Hubbard Dr. Hubbard’s theoretical work is currently being carried out on the structure and evolution of Jupiter, Saturn, extrasolar giant planets (EGPs), and on the structure of Pluto’s high atmosphere. In collaboration with Burkhard Militzer at UC Berkeley, Hubbard is incorporating Militzer’s first-principles density-functional equations of state for hydrogen-helium mixtures in models of Jupiter, Saturn, and EGPs. The models are matched to measurements of heat flow, mass, radius, and high-order gravity field (where known). One of the main objectives of the research is a determination of the metallicity of Jupiter and a validation of the standard cooling theory that is applied to EGPs. In collaboration with Adam Showman (LPL) and Yohai Kaspi (Caltech), Hubbard is analyzing the signature of interior dynamics on Jupiter’s high-order gravity field. The above projects are a component of Hubbard’s research related to his role as a coinvestigator on the Juno spacecraft scheduled to enter Jupiter orbit in 2016. The Pluto research analyzes high-precision stellar occultation data obtained at the Multiple Mirror Telescope in collaboration with Don McCarthy (Steward Observatory) and Jim Elliot (MIT). The data provide good evidence for an internal gravity wave model that may apply in general to scintillations observed in stellar occultations by a variety of planetary atmospheres. More about Dr. Hubbard. |
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