Planetesimal Growth in Evolving Protoplanetary Disks: Constraints from the Pebble Supply

Abstract

In the core accretion model, planetesimals grow by mutual collisions and engulfing millimeter-to-centimeter particles, i.e., pebbles. Pebble accretion can significantly increase the accretion efficiency and help explain the presence of planets on wide orbits. However, the pebble supply is typically parameterized as a coherent pebble mass flux, sometimes being constant in space and time. Here we solve the dust advection and diffusion within viciously evolving protoplanetary disks to determine the pebble supply self-consistently. The pebbles are then accreted by planetesimals interacting with the gas disk via gas drag and gravitational torque. The pebble supply is variable with space and decays with time quickly, with a pebble flux below 10 $M_{\oplus }$ Myr${}^{-1}$ after 1 Myr in our models. As a result, only when massive planetesimals ($>$ 0.01 $M_{\oplus }$) are luckily produced by the streaming instability or the disk has low viscosity ($\alpha \sim 0.0001$) can the herd of planetesimals grow over a Mars mass within 2 Myr. By then, planetesimals only capture pebbles about 50 times their mass and as little as 10 times beyond 20 au due to limited pebble supply. Further studies considering multiple dust species in various disk conditions are warranted to fully assess the realistic pebble supply and its influence on planetesimal growth.

ApJ accepted

References in corpus (57)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Protoplanetary Disks and Their Evolution
• Streaming Instabilities in Protoplanetary Disks
• REBOUND: An open-source multi-purpose N-body code for collisional dynamics
• Rapid growth of gas-giant cores by pebble accretion
• Gas- and dust evolution in protoplanetary disks
• Particle Stirring in Turbulent Gas Disks: Including Orbital Oscillations
• The effect of gas drag on the growth of protoplanets -- Analytical expressions for the accretion of small bodies in laminar disks
• Ringed Substructure and a Gap at 1 AU in the Nearest Protoplanetary Disk
• Forming the cores of giant planets from the radial pebble flux in protoplanetary discs
• Radial Flow of Dust Particles in Accretion Disks
• Forming Planetesimals in Solar and Extrasolar Nebulae
• On the orbital evolution and growth of protoplanets embedded in a gaseous disc
• Formation of the Terrestrial Planets from a Narrow Annulus
• Planetesimal formation starts at the snow line
• The great dichotomy of the Solar System: small terrestrial embryos and massive giant planet cores
• Formation of planetary systems by pebble accretion and migration: How the radial pebble flux determines a terrestrial-planet or super-Earth growth mode
• Three-dimensional simulations of multiple protoplanets embedded in a protostellar disc
• REBOUNDx: A Library for Adding Conservative and Dissipative Forces to Otherwise Symplectic N-body Integrations
• Accelerated planetesimal growth in self-gravitating protoplanetary discs
• Initial mass function of planetesimals formed by the streaming instability
• Four annular structures in a protostellar disk less than 500,000 years old
• Thresholds for Particle Clumping by the Streaming Instability
• Chemical Imaging of the CO Snow Line in the HD 163296 Disk
• Hybrid Symplectic Integrators for Planetary Dynamics
• Dust Density Distribution and Imaging Analysis of Different Ice Lines in Protoplanetary Disks
• A giant exoplanet orbiting a very low-mass star challenges planet formation models
• ALMA imaging of the CO snowline of the HD 163296 disk with DCO+
• Robustness of N2H+ as tracer of the CO snowline
• Catching drifting pebbles I. Enhanced pebble accretion efficiencies for eccentric planets
• Low dust emissivities and radial variations in the envelopes of Class 0 protostars: a signature of early grain growth?
• DustPy: A Python Package for Dust Evolution in Protoplanetary Disks
• Planetesimal Population Synthesis: Pebble Flux Regulated Planetesimal Formation
• Planet formation by pebble accretion in ringed disks
• High gas/dust size ratio indicating efficient radial drift in the mm-faint CX Tau disk
• Pebble-driven Planet Formation around Very Low-mass Stars and Brown Dwarfs
• How dust fragmentation may be beneficial to planetary growth by pebble accretion
• A Tale of Planet Formation: From Dust to Planets
• Growth after the streaming instability: from planetesimal accretion to pebble accretion
• Efficient planet formation by pebble accretion in ALMA rings
• Molecules with ALMA at Planet-forming Scales (MAPS). A Circumplanetary Disk Candidate in Molecular Line Emission in the AS 209 Disk
• Rapid Formation of Massive Planetary Cores in a Pressure Bump
• A Lagrangian Model for Dust Evolution in Protoplanetary Disks: Formation of Wet and Dry Planetesimals at Different Stellar Masses
• A Balanced Budget View on Forming Giant Planets by Pebble Accretion
• Formation of intermediate-mass planets via magnetically-controlled disk fragmentation
• An Analytical Theory for the Growth from Planetesimals to Planets by Polydisperse Pebble Accretion
• Unified simulations of planetary formation and atmospheric evolution: Effects of pebble accretion, giant impacts, and stellar irradiations on super-Earth formation
• The impact of dynamic pressure bumps on the observational properties of protoplanetary disks
• Direct Formation of Planetary Embryos in Self-Gravitating Disks
• The formation of wide exoKuiper belts from migrating dust traps
• Coagulation Instability in Protoplanetary Disks: A Novel Mechanism Connecting Collisional Growth and Hydrodynamical Clumping of Dust Particles
• On the non-axisymmetric fragmentation of rings generated by the Secular Gravitational Instability
• Growth after the streaming instability: The radial distance dependence of the planetary growth
• Formation of the First Planetesimals via the Streaming Instability in Globally Turbulent Protoplanetary Disks?
• Extreme close encounters between proto-Mercury and proto-Venus in terrestrial planet formation
• Turbulent Transport of Dust Particles in Protostellar Disks: The Effect of Upstream Diffusion
• Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks II: Dust Ring Formation Mediated by Backreaction and Fragmentation

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