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• W3211846570 endingPage "3193" @default.
• W3211846570 startingPage "3181" @default.
• W3211846570 abstract "ABSTRACT Observations indicate that large, dust-laden protoplanetary discs are common. Some features, like gaps, rings, and spirals, suggest they may host young planets, which can excite the orbits of nearby leftover planetesimals. Energetic collisions among these bodies can lead to the production of second-generation dust. Grains produced by collisions may have a dynamical behaviour different from that of first-generation, primordial dust out of which planetesimals and planets formed. We aim to study these differences for the HD 163296 system and determine whether dynamical signatures in the mixture of the two dust populations can help separate their contributions. We use three-dimensional (3D) hydrodynamic models to describe the gaseous disc with three, Saturn- to Jupiter-mass, embedded planets. Dust grains, of sizes $1, mu mathrm{m}$–$1, mathrm{mm}$, are treated as Lagrangian particles with resolved thermodynamics and mass-loss. Initial disc and planet configurations are derived from observation-based work, which indicates low gas viscosity. The 3D approach also allows us to detect the formation of vortices induced by Rossby waves, where dust becomes concentrated and may contribute to planetesimal formation. We find that the main differences in the dynamical behaviour of first- and second-generation dust occur in the vertical distribution. The two populations have similar distributions around the disc mid-plane, although second-generation dust shows longer residence times close to the radial locations of the planets’ gas gaps. Sedimentation rates of $mu$m-sized grains are comparable to or lower than the production rates by planetesimals’ collisions, making this population potentially observable. These outcomes can be extended to similar systems harbouring giant planets." @default.
• W3211846570 created "2021-11-22" @default.
• W3211846570 creator A5028320043 @default.
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• W3211846570 date "2021-11-10" @default.
• W3211846570 modified "2023-10-16" @default.
• W3211846570 title "Second-generation dust in planetary systems: the case of HD 163296" @default.
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• W3211846570 doi "https://doi.org/10.1093/mnras/stab3220" @default.
• W3211846570 hasPublicationYear "2021" @default.
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