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Fig. 4

image

Sample of gas streamlines arriving from the upstream direction with respect to the planet (run RADL27k0.01). The core is located at x = rap = 0, y = ap(φφp) = 0, z = 0, as indicated by the black circle, and surrounded by a transparent purple sphere with radius r = rH. Results are shown in the frame co-rotating with the planet. Blue and green streamlines make a perturbed horseshoe orbit. Gas parcels arrive well above the midplane (z >rH), enter the Hill sphere, and subsequently exit closer to the midplane (z < rH). The red and orange curves are examples of streamlines that interact strongly with the core. The orange streamline circulates closely around the core (within r < 0.5rH), while the red streamline indicates a gas parcel that remains trapped for the duration of the integration.

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