Dust trapping in protoplanetary discs after stellar flybys
arXiv:2509.11909 · doi:10.1093/mnras/staf1579
Abstract
Stellar flybys are likely to be common in young star-forming regions and could be responsible for substructures observed in protoplanetary discs. Using three-dimensional smoothed particle hydrodynamics simulations, we study dust trapping in discs perturbed by parabolic coplanar flybys. We find that spiral structures are induced in the gas and dust discs for both prograde and retrograde encounters. By tracking individual dust particles within the flyby-induced substructures, we determine that they have a highly enhanced dust to gas ratio compared to particles in an unperturbed disc. We further find that the local dust to gas ratios in flyby-induced substructures are sufficiently high to trigger the streaming instability and hence facilitate planetesimal formation in young discs.
17 pages, 18 figures, 2 appendices. Accepted for publication in MNRAS
References in corpus (39)
- Streaming Instabilities in Protoplanetary Disks
- SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
- Smoothed Particle Hydrodynamics and Magnetohydrodynamics
- Radial Flow of Dust Particles in Accretion Disks
- Ring shaped dust accumulation in transition disks
- Phantom: A smoothed particle hydrodynamics and magnetohydrodynamics code for astrophysics
- Observations of Protoplanetary Disk Structures
- On the diversity and statistical properties of protostellar discs
- CMasher: Scientific colormaps for making accessible, informative and 'cmashing' plots
- Concentrating small particles in protoplanetary disks through the streaming instability
- Dust Evolution and the Formation of Planetesimals
- On planet formation in HL Tau
- How to form planetesimals from mm-sized chondrules and chondrule aggregates
- Inverse dynamical population synthesis: Constraining the initial conditions of young stellar clusters by studying their binary populations
- On the diffusive propagation of warps in thin accretion discs
- Protoplanetary disc truncation mechanisms in stellar clusters: comparing external photoevaporation and tidal encounters
- Thresholds for Particle Clumping by the Streaming Instability
- Flybys in protoplanetary discs: I. Gas and dust dynamics
- Warp diffusion in accretion discs: a numerical investigation
- Dust growth and evolution in protoplanetary disks
- Dusty gas with SPH - I. Algorithm and test suite
- Self-induced dust traps: overcoming planet formation barriers
- Early evolution of the birth cluster of the solar system
- Streaming Instability for Particle-Size Distributions
- A tidal encounter caught in the act: modelling a star-disc fly-by in the young RW Aurigae system
- Dust trapping by spiral arms in gravitationally unstable protostellar discs
- On the accumulation of planetesimals near disc gaps created by protoplanets
- Flybys in protoplanetary discs: II. Observational signatures
- Multiple Stellar Fly-Bys Sculpting the Circumstellar Architecture in RW Aurigae
- Dusty gas with SPH - II. Implicit timestepping and astrophysical drag regimes
- Ongoing flyby in the young multiple system UX Tauri
- Two fluid dust and gas mixtures in SPH: A semi-implicit approach
- Slingshot Mechanism for Clusters: Gas Density Regulates Star Density in the Orion Nebula Cluster (M42)
- Evidence of a past disc-disc encounter: HV and DO Tau
- A likely flyby of binary protostar Z CMa caught in action
- Two-fluid dust and gas mixtures in smoothed particle hydrodynamics II: an improved semi-implicit approach
- A solution to the overdamping problem when simulating dust-gas mixtures with smoothed particle hydrodynamics
- Exciting spiral arms in protoplanetary discs from flybys
- Dynamical dust traps in misaligned circumbinary discs: analytical theory and numerical simulations