A 3D Hydrodynamics Study of Gravitational Instabilities in a Young Circumbinary Disc

Abstract

We present a 3D hydrodynamics study of gravitational instabilities (GIs) in a 0.14 M${}_{\odot }$ circumbinary protoplanetary disc orbiting a 1 M${}_{\odot }$ star and a 0.02 M${}_{\odot }$ brown dwarf companion. We examine the thermodynamical state of the disc and determine the strengths of GI-induced density waves, nonaxisymmetric density structures, mass inflow and outflow, and gravitational torques. Results are compared with a parallel simulation of a protoplanetary disc without the brown dwarf binary companion. Simulations are performed using CHYMERA, a radiative 3D hydrodynamics code. The onset of GIs in the circumbinary disc is much more violent due to the stimulation of a strong one-armed density wave by the brown dwarf. Despite this early difference, detailed analyses show that both discs relax to a very similar quasi-steady phase by 2,500 years after the beginning of the simulations. Similarities include the thermodynamics of the quasi-steady phase, the final surface density distribution, radial mass influx, and nonaxisymmetric power and torques for spiral arm multiplicities of two or more. Effects of binarity in the disc are evident in gravitational torque profiles, temperature profiles in the inner discs, and radial mass transport. After 3,800 years, the semimajor axis of the binary decreases by about one percentage and the eccentricity roughly doubles. The mass transport in the outer circumbinary disc associated with the one-armed wave may influence planet formation.

References in corpus (36)

• Nonlinear Outcome of Gravitational Instability in Cooling, Gaseous Disks
• Rossby Wave Instability of Keplerian Accretion Disks
• Accretion Disks Around Young Objects. III. Grain Growth
• Gravitational Instabilities in Circumstellar Disks
• The locality of transport in self-gravitating accretion discs
• Rossby Wave Instability of Thin Accretion Disks -- II. Detailed Linear Theory
• Investigating fragmentation conditions in self-gravitating accretion discs
• The Migration and Growth of Protoplanets in Protostellar Discs
• Rossby Wave Instability of Thin Accretion Disks - III. Nonlinear Simulations
• Nonlinear Outcome of Gravitational Instability in Disks with Realistic Cooling
• A pair of planets around HD 202206 or a circumbinary planet?
• The Thermal Regulation of Gravitational Instabilities in Protoplanetary Disks III. Simulations with Radiative Cooling and Realistic Opacities
• Standing on the shoulders of giants: Trojan Earths and vortex trapping in low mass self-gravitating protoplanetary disks of gas and solids
• The Thermal Regulation of Gravitational Instabilities in Protoplanetary Disks II. Extended Simulations with Varied Cooling Rates
• Planet formation is unlikely in equal mass binary systems with a ~ 50 AU
• Gas Giant Protoplanets Formed by Disk Instability in Binary Star Systems
• On Gas-Drag Induced Rapid Migration of Solids in a Non-Uniform Solar Nebula
• Vortices In Circumstellar Disks
• The Internal Energy for Molecular Hydrogen in Gravitationally Unstable Protoplanetary Disks
• Gravitational instability in binary protoplanetary disks; new constraints on giant planet formation
• Particle Trapping and Streaming Instability in Vortices
• A compact concentration of large grains in the HD142527 protoplanetary dust trap
• Dynamics of Circumstellar Disks
• Dynamics of Circumstellar Disks II: Heating and Cooling
• Migration of Gas Giant Planets in Gravitationally Unstable Disks
• 3D Radiative Hydrodynamics for Disk Stability Simulations: A Proposed Testing Standard and New Results
• Chemistry in a gravitationally unstable protoplanetary disc
• Rossby Wave Instability in Astrophysical Discs
• Simulated Observations of Young Gravitationally Unstable Protoplanetary Discs
• Variability and dust filtration in the transition disk J160421.7-213028 observed in optical scattered light
• The fragmentation criteria in local vertically stratified self-gravitating disk simulations
• Gravitational instabilities in a protosolar-like disc I: dynamics and chemistry
• The Role of Disc Self-Gravity in Circumbinary Planet Systems: I. Disc Structure and Evolution
• Dynamics of Circumstellar Disks III: The case of GG Tau A
• Gravitational instabilities in a protosolar-like disc II: continuum emission and mass estimates
• The Role of Disc Self-Gravity in Circumbinary Planet Systems: II. Planet Evolution

Cited by in corpus (4)

• Spiral structures in gravito-turbulent gaseous disks
• Formation of pebbles in (gravito-)viscous protoplanetary disks with various turbulent strengths
• Unveiling the traits of massive young stellar objects through a multi-scale survey
• A distant brown dwarf coplanar to a warm Jupiter and a hot super-Earth