Episodic accretion: the interplay of infall and disc instabilities

Abstract

Using zoom-simulations carried out with the adaptive mesh-refinement code RAMSES with a dynamic range of up to $2^{27}\approx 1.34\times 10^8$ we investigate the accretion profiles around six stars embedded in different environments inside a (40 pc)${}^3$ giant molecular cloud, the role of mass infall and disc instabilities on the accretion profile, and thus on the luminosity of the forming protostar. Our results show that the environment in which the protostar is embedded determines the overall accretion profile of the protostar. Infall on to the circumstellar disc may trigger gravitational disc instabilities in the disc at distances of around ~10 to ~50 au leading to rapid transport of angular momentum and strong accretion bursts. These bursts typically last for about ~10 to a ~100 yr, consistent with typical orbital times at the location of the instability, and enhance the luminosity of the protostar. Calculations with the stellar evolution code mesa show that the accretion bursts induce significant changes in the protostellar proper- ties, such as the stellar temperature and radius. We apply the obtained protostellar properties to produce synthetic observables with RADMC3D and predict that accretion bursts lead to ob- servable enhancements around 20 to 200 $\mu$m in the spectral energy distribution of Class 0 type young stellar objects.

17 pages, 14 figures, accepted by MNRAS

References in corpus (21)

• Modules for Experiments in Stellar Astrophysics (MESA)
• Line and Mean Opacities for Ultracool Dwarfs and Extrasolar Planets
• Global simulations of protoplanetary disks with ohmic resistivity and ambipolar diffusion
• Shadows and spirals in the protoplanetary disk HD 100453
• Variable protostellar accretion with episodic bursts
• An extraordinary outburst in the massive protostellar system NGC6334I-MM1: quadrupling of the millimeter continuum
• Magnetically self-regulated formation of early protoplanetary discs
• Misaligned Disks in the Binary Protostar IRS 43
• Infall-Driven Protostellar Accretion and the Solution to the Luminosity Problem
• HOPS 383: An Outbursting Class 0 Protostar in Orion
• Hall-effect Mediated Magnetic Flux Transport in Protoplanetary Disks
• Molecule sublimation as a tracer of protostellar accretion: Evidence for accretion bursts from high angular resolution C18O images
• Effects of radiation transfer on the structure of self-gravitating disks, their fragmentation and evolution of the fragments
• Accretion and magnetic field morphology around Class 0 stage protostellar discs
• The outburst of the eruptive young star OO Serpentis between 1995 and 2006
• Revisiting the pre-main-sequence evolution of stars I. Importance of accretion efficiency and deuterium abundance
• Explaining the luminosity spread in young clusters: proto and pre-main sequence stellar evolution in a molecular cloud environment
• Long-term variability of T Tauri stars using WASP
• Spitzer Observations of Long Term Infrared Variability Among Young Stellar Objects in Chamaeleon I
• The effect of external environment on the evolution of protostellar disks
• The effects of large scale magnetic fields around young protostars and their disks

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