Dust back-reaction on gas around planets modifies the cold thermal torque
arXiv:2511.01973 · doi:10.1051/0004-6361/202452971
Abstract
A nascent planet in a gas disk experiences radial migration due to the different torques which act on it. It has recently been shown that the torques produced by the gas and dust density variations around a non-accreting low-mass planet, the so-called cold thermal and dust streaming torques, can surpass each of the other torque components. We investigate how the total torque acting on the planet is affected by the presence of dust grains and their aerodynamic back-reaction on gas, while taking into account the cold thermal torque produced by thermal diffusion in the gas component. We perform high-resolution local and global three-dimensional two-fluid simulations within the pressureless-fluid dust approximation using the Fargo3D code. We explore the influence of different dust species parameterized by the Stokes number, focusing on non-accreting protoplanets with masses from one-third the mass of Mars to one Earth mass. The dust feedback has substantial impact on the asymmetry of the cold thermal lobes (which produce the cold thermal torque). However, the total torque is dominated by the dust torque when St . The dust torque becomes more negative over time due to the formation of dust lobes that resemble the cold thermal lobes that form in the gas component. Therefore, the dust streaming torque prevails over the cold thermal torque. On the other hand, when St , the dust streaming torque is negligible and thus, the total torque on the planet comes from the gaseous component of the disk. Our results suggest that a planet embedded in a gas-dust disk may experience stagnant migration or inward runaway migration in regions of the protoplanetary disk where the dust is not fully coupled to the gas. However, this behaviour could change in regions with strong dust-gas coupling or in the inner transition region of the disk, where the cold thermal torque may become relevant.
10 pages, 9 figures, 1 table, accepted for publication in A&A
References in corpus (31)
- FARGO: a fast eulerian transport algorithm for differentially rotating disks
- A torque formula for non-isothermal Type I planetary migration - II. Effects of diffusion
- Separating gas-giant and ice-giant planets by halting pebble accretion
- A comparative study of disc-planet interaction
- Pebble isolation mass --- scaling law and implications for the formation of super-Earths and gas giants
- FARGO3D: A new GPU-oriented MHD code
- Planet migration in three-dimensional radiative discs
- Planet heating prevents inward migration of planetary cores
- Treating gravity in thin disk simulations
- Asymptotically stable numerical method for multispecies momentum transfer: gas and multifluid-dust test suite and implementation in FARGO3D
- Migration of Earth-size planets in 3D radiative discs
- Coorbital thermal torques on low-mass protoplanets
- Stellar irradiated discs and implications on migration of embedded planets II: accreting-discs
- Improved torque formula for low and intermediate mass planetary migration
- Characterizing the variable dust permeability of planet-induced gaps
- Three-Dimensional Radiation-Hydrodynamics Calculations of the Envelopes of Young Planets Embedded in Protoplanetary Disks
- Dust Transport in MRI Turbulent Disks: Ideal and Non-ideal MHD with Ambipolar Diffusion
- Torques Induced by Scattered Pebble-flow in Protoplanetary Disks
- Evolution of eccentricity and inclination of hot protoplanets embedded in radiative discs
- Influence of viscosity and the adiabatic index on planetary migration
- Magnetically Induced Disk Winds and Transport in the HL Tau Disk
- Horseshoe drag in three-dimensional globally isothermal disks
- Astrophysical fluid simulations of thermally ideal gases with non-constant adiabatic index: numerical implementation
- Torques felt by solid accreting planets
- Dynamical friction with radiative feedback -- II. High resolution study of the subsonic regime
- Pebble-driven migration of low-mass planets in the 2D regime of pebble accretion
- Numerical study of coorbital thermal torques on cold or hot satellites
- Eccentricity driving of pebble accreting low-mass planets
- How the planetary eccentricity influences the pebble isolation mass
- RAM: Rapid Advection Algorithm on Arbitrary Meshes
- Dust-void evolution driven by turbulent dust flux can induce runaway migration of Earth-mass planets