Extreme Pebble Accretion in Ringed Protoplanetary Discs

Abstract

Axisymmetric dust rings containing tens to hundreds of Earth masses of solids have been observed in protoplanetary discs with (sub-)millimetre imaging. Here, we investigate the growth of a planetary embryo in a massive (150M${}_{\oplus }$) axisymmetric dust trap through dust and gas hydrodynamics simulations. When accounting for the accretion luminosity of the planetary embryo from pebble accretion, the thermal feedback on the surrounding gas leads to the formation of an anticyclonic vortex. Since the vortex forms at the location of the planet, this has significant consequences for the planet's growth: as dust drifts towards the pressure maximum at the centre of the vortex, which is initially co-located with the planet, a rapid accretion rate is achieved, in a distinct phase of ``vortex-assisted'' pebble accretion. Once the vortex separates from the planet due to interactions with the disc, it accumulates dust, shutting off accretion onto the planet. We find that this rapid accretion, mediated by the vortex, results in a planet containing $\approx$ 100M${}_{\oplus }$ of solids. We follow the evolution of the vortex, as well as the efficiency with which dust grains accumulate at its pressure maximum as a function of their size, and investigate the consequences this has for the growth of the planet as well as the morphology of the protoplanetary disc. We speculate that this extreme formation scenario may be the origin of giant planets which are identified to be significantly enhanced in heavy elements.

20 pages, 14 figures. Accepted for publication in MNRAS. Supplementary material can be found at https://doi.org/10.5281/zenodo.6761702

References in corpus (42)

• Protoplanetary Disk Structures in Ophiuchus
• Particle Stirring in Turbulent Gas Disks: Including Orbital Oscillations
• Photoevaporation of protoplanetary discs II: evolutionary models and observable properties
• Separating gas-giant and ice-giant planets by halting pebble accretion
• A comparative study of disc-planet interaction
• Ring shaped dust accumulation in transition disks
• Dust filtration at gap edges: Implications for the spectral energy distributions of discs with embedded planets
• Grain Retention and Formation of Planetesimals near the Snow Line in MRI-driven Turbulent Protoplanetary Disks
• Dust size distributions in coagulation/fragmentation equilibrium: Numerical solutions and analytical fits
• Dust dynamics during protoplanetary disc clearing
• LkH$\alpha$ 330: Evidence for dust clearing through resolved submillimeter imaging
• Meridional flows in the disk around a young star
• Initial mass function of planetesimals formed by the streaming instability
• Planet formation bursts at the borders of the dead zone in 2D numerical simulations of circumstellar disks
• Vortex generation in protoplanetary disks with an embedded giant planet
• The Radial Distribution of Dust Particles in the HL Tau Disk from ALMA and VLA Observations
• Standing on the shoulders of giants: Trojan Earths and vortex trapping in low mass self-gravitating protoplanetary disks of gas and solids
• CO and dust properties in the TW Hya disk from high-resolution ALMA observations
• Can dust coagulation trigger streaming instability?
• Magnetic Flux Concentration and Zonal Flows in Magnetorotational Instability Turbulence
• On the Stability of Elliptical Vortices in Accretion Discs
• On the origin of horseshoes in transitional discs
• Effects of dust feedback on vortices in protoplanetary disks
• Coorbital thermal torques on low-mass protoplanets
• The efficiency of dust trapping in ringed proto-planetary discs
• Planet formation by pebble accretion in ringed disks
• 3D MHD Simulations of Planet Migration in Turbulent Stratified Disks
• Dust-driven viscous ring-instability in protoplanetary disks
• Slowly-growing gap-opening planets trigger weaker vortices
• Growth after the streaming instability: from planetesimal accretion to pebble accretion
• Linear growth of streaming instability in pressure bumps
• Radiation pressure clear-out of dusty photoevaporating discs
• Fast Modes and Dusty Horseshoes in Transitional Disks
• Snow-lines can be thermally unstable
• ALMA Observations of the Asymmetric Dust Disk around DM Tau
• The importance of thermal torques on the migration of planets growing by pebble accretion
• Impact of thermal effects on the evolution of eccentricity and inclination of low-mass planets
• Modeling the nonaxisymmetric structure in the HD 163296 disk with planet-disk interaction
• Dust traps as planetary birthsites: basics and vortex formation
• Torques felt by solid accreting planets
• Interpreting Brightness Asymmetries in Transition Disks: Vortex at Dead Zone or Planet Carved Gap Edges?
• Increased isolation mass for pebble accreting planetary cores in pressure maxima of protoplanetary discs

Cited by in corpus (1)

• Efficient planet formation by pebble accretion in ALMA rings