Giant Impacts During Planet Formation: Parallel Tree Code Simulations Using Smooth Particle Hydrodynamics

Details Giant Impacts During Planet Formation: Parallel Tree Code Simulations Using Smooth Particle Hydrodynamics Giant Impacts During Planet Formation: Parallel Tree Code Simulations Using Smooth Particle Hydrodynamics

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000dps....32.6532c&link_type=abstract

American Astronomical Society, DPS Meeting #32, #65.32; Bulletin of the American Astronomical Society, Vol. 32, p.1645

Astronomy and Astrophysics

Astronomy

Scientific paper

There is both theoretical and observational evidence that giant planets collided with objects with mass >= Mearth during their evolution. These impacts may help shorten planetary formation timescales by changing the opacity of the planetary atmosphere to allow quicker cooling. They may also redistribute heavy metals within giant planets, affect the core/envelope mass ratio, and help determine the ratio of emitted to absorbed energy within giant planets. Thus, the researchers propose to simulate the impact of a ~ Earth-mass object onto a proto-giant-planet with SPH. Results of the SPH collision models will be input into a steady-state planetary evolution code and the effect of impacts on formation timescales, core/envelope mass ratios, density profiles, and thermal emissions of giant planets will be quantified. The collision will be modelled using a modified version of an SPH routine which simulates the collision of two polytropes. The Saumon-Chabrier and Tillotson equations of state will replace the polytropic equation of state. The parallel tree algorithm of Olson & Packer will be used for the domain decomposition and neighbor search necessary to calculate pressure and self-gravity efficiently. This work is funded by the NASA Graduate Student Researchers Program.

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