Particle concentration at planet-induced gap edges and vortices. I. inviscid three-dimensional hydro disks

Zhaohuan Zhu, James McLellan Stone, Roman R. Rafikov, Xue Ning Bai

Research output: Contribution to journalArticlepeer-review

101 Scopus citations

Abstract

We perform a systematic study of the dynamics of dust particles in protoplanetary disks with embedded planets using global two-dimensional and three-dimensional inviscid hydrodynamic simulations. Lagrangian particles have been implemented into the magnetohydrodynamic code Athena with cylindrical coordinates. We find two distinct outcomes depending on the mass of the embedded planet. In the presence of a low-mass planet (8 M ), two narrow gaps start to open in the gas on each side of the planet where the density waves are shocked. These shallow gaps can dramatically affect particle drift speed and cause significant, roughly axisymmetric dust depletion. On the other hand, a more massive planet (>0.1 MJ) carves out a deeper gap with sharp edges, which are subject to Rossby wave instability leading to vortex formation. Particles with a wide range of sizes (0.02 < Ωt s < 20) are trapped and settle to the midplane in the vortex, with the strongest concentration for particles with Ωts 1. The dust concentration is highly elongated in the φ direction, and can be as wide as four disk scale heights in the radial direction. Dust surface density inside the vortex can be increased by more than a factor of 102 in a very non-axisymmetric fashion. For very big particles (Ωts ≫ 1) we find strong eccentricity excitation, in particular around the planet and in the vicinity of the mean motion resonances, facilitating gap openings there. Our results imply that in weakly turbulent protoplanetary disk regions (e.g., the "dead zone") dust particles with a very wide range of sizes can be trapped at gap edges and inside vortices induced by planets with Mp < MJ , potentially accelerating planetesimal and planet formation there, and giving rise to distinctive features that can be probed by ALMA and the Extended Very Large Array.

Original languageEnglish (US)
Article number122
JournalAstrophysical Journal
Volume785
Issue number2
DOIs
StatePublished - Apr 20 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • accretion, accretion disks
  • astroparticle physics
  • hydrodynamics
  • instabilities
  • planetdisk interactions
  • protoplanetary disks
  • stars: pre-main sequence
  • stars: protostars
  • waves

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