Fig. 2

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Eccentricity and semimajor axis evolution for the planetesimals in some selected simulations. Each simulation has a total of 10 000 planetesimals being injected continuously until the time of disk dissipation. The black dots indicate the current mass and location of Jupiter and Saturn. The black lines are lines of equal Tisserand parameter going through the planet location (solid line) and the planet location offset by 5 Hill radii (dashed line). Planetesimals initiated inside the feeding zone of the planet (labeled 2–3 RH) suffer from stronger and faster scattering than those initiated outside the feeding zone (labeled 4–5 RH). Decreasing the planetesimal size leads to more gas drag and lower eccentricities, and it results in a population of circularized planetesimals interior of Jupiter.
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