Episodic accretion in high-mass star formation: An analysis of thermal instability for axially symmetric disks
arXiv:2507.20781 · doi:10.1051/0004-6361/202555559
Abstract
High-mass young stellar objects exhibit episodic accretion bursts similar to their low-mass counterparts. Understanding these outbursts is crucial for elucidating massive star formation and disk evolution around high-mass protostars. We investigate thermal instability's role in triggering accretion outbursts using a two-dimensional hydrodynamical model that fully resolves the vertical structure of the inner disk. This approach provides a more realistic depiction of axially symmetric disk dynamics and assesses observable burst signatures. We simulate the inner 10 astronomical units of a circumstellar disk around a high-mass protostar, incorporating viscous heating and radiative transport in radial and vertical directions. Unlike previous one-dimensional studies, our two-dimensional model resolves time-dependent vertical disk structure, capturing complex radial-vertical dynamics. Our simulations show thermal instability causes significant structural changes. Steep temperature gradients and vigorous convection develop at outburst onset, with gas flows differing between midplane and upper layers. Energy release produces 15-30 year outbursts with peak accretion rates of . While observable, these bursts are insufficiently bright with rise times differing from rapid observed events. Our models lack the "reflares" seen in one-dimensional calculations. Resolving full vertical disk structure is essential for accurate thermal instability modeling. While thermal instability significantly influences episodic accretion, it appears insufficient alone to explain observed HMYSO outburst diversity. Additional mechanisms are required for comprehensive understanding.
17 pages; 15 figures; Accepted for publication in A&A
References in corpus (48)
- PLUTO: a Numerical Code for Computational Astrophysics
- Accretion disc viscosity: how big is alpha?
- Star formation through gravitational collapse and competitive accretion
- The Burst Mode of Protostellar Accretion
- Circumventing the radiation pressure barrier in the formation of massive stars via disk accretion
- Three-dimensional simulation of massive star formation in the disk accretion scenario
- Measuring turbulent motion in planet-forming disks with ALMA: A detection around DM Tau and non-detections around MWC 480 and V4046 Sgr
- An extraordinary outburst in the massive protostellar system NGC6334I-MM1: quadrupling of the millimeter continuum
- Global MHD simulations of stratified and turbulent protoplanetary discs. I. Model properties
- On the existence of accretion-driven bursts in massive star formation
- Empirical constraints on turbulence in proto-planetary discs
- 3D Radiation Non-ideal Magnetohydrodynamical Simulations Of The Inner Rim In Protoplanetary Disks
- The efficiency of dust trapping in ringed proto-planetary discs
- Protoplanetary disc `isochrones' and the evolution of discs in the plane
- Molecular Line Emission from Massive Protostellar Disks: Predictions for ALMA and the EVLA
- Convection Causes Enhanced Magnetic Turbulence in Accretion Disks in Outburst
- Protoplanetary Disks as (Possibly) Viscous Disks
- The Impact of Feedback During Massive Star Formation by Core Accretion
- The ALMA early science view of FUor/EXor objects - V: continuum disc masses and sizes
- The viscosity parameter alpha and the properties of accretion disc outbursts in close binaries
- Modeling disk fragmentation and multiplicity in massive star formation
- Mean gas opacity for circumstellar environments and equilibrium temperature degeneracy
- Resolving the FU Ori System with ALMA: Interacting Twin Disks?
- Protostellar collapse: the conditions to form dust rich protoplanetary disks
- Gravitational instability in a planet-forming disk
- Dwarf Nova Outbursts with Magnetorotational Turbulence
- Outbursts in Global Protoplanetary Disk Simulations
- Establishing the evolutionary timescales of the massive star formation process through chemistry
- Accretion bursts in magnetized gas-dust protoplanetary disks
- M17 MIR: A massive protostar with multiple accretion Outbursts
- Magnetic Turbulence and Thermodynamics in the Inner Region of Protoplanetary Discs
- Disk Kinematics and Stability in High-Mass Star Formation: Linking Simulations and Observations
- The Extraordinary Outburst in the Massive Protostellar System NGC6334I-MM1: Strong Increase in Mid-Infrared Continuum Emission
- Impact of convection and resistivity on angular momentum transport in dwarf novae
- Dynamical Accretion Flows -- ALMAGAL: Flows along filamentary structures in high-mass star-forming clusters
- Makemake + Sedna: A Continuum Radiation Transport and Photoionization Framework for Astrophysical Newtonian Fluid Dynamics
- Multi-scale view of star formation in IRAS 21078+5211: From clump fragmentation to disk wind
- Modeling disks and magnetic outflows around a forming massive star: I. Investigating the two layer-structure of the accretion disk
- Kinematics and stability of high-mass protostellar disk candidates at sub-arcsecond resolution -- Insights from the IRAM NOEMA large program CORE
- Accretion bursts in high-mass protostars: a new testbed for models of episodic accretion
- The sharpest view on the high-mass star-forming region S255IR. Near-InfraRed Adaptive Optics Imaging on the Outbursting Source NIRS3
- Variability of the inner dead zone edge in 2D radiation hydrodynamic simulations
- Time-dependent, long-term hydrodynamic simulations of the inner protoplanetary disk I: The importance of stellar magnetic torques
- The accretion burst of the massive young stellar object G323.46 -0.08
- Episodic accretion and mergers during growth of massive protostars
- Two-dimensional simulations of disks in close binaries: Simulating outburst cycles in cataclysmic variables
- Photometric and Spectroscopic monitoring of YSOs in nearby star forming regions. I. Eruptive YSOs
- The Role of Thermal Instability in Accretion Outbursts in High-Mass Stars