Protostellar disk accretion in turbulent filaments

Abstract

Recent observations of protostellar cores suggest that most of the material in the protostellar phase is accreted along streamers. Streamers in this context are defined as velocity coherent funnels of denser material potentially connecting the large scale environment to the small scales of the forming accretion disk. Using simulations which simultaneously resolve the driving of turbulence on the filament scale as well as the collapse of the core down to protostellar disk scales, we aim to understand the effect of the turbulent velocity field on the formation of overdensities in the accretion flow. We perform a three-dimensional numerical study on a core collapse within a turbulent filament using the RAMSES code and analyse the properties of overdensities in the accretion flow. We find that overdensities are formed naturally by the initial turbulent velocity field inherited from the filament and subsequent gravitational collimation. This leads to streams which are not really filamentary but show a sheet-like morphology. Moreover, they have the same radial infall velocities as the low density material. As a main consequence of the turbulent initial condition, the mass accretion onto the disk does not follow the predictions for solid body rotation. Instead, most of the mass is funneled by the overdensities to intermediate disk radii.

References in corpus (69)

• HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• Dense Cores in Dark Clouds. XIV. N2H+(1-0) maps of dense cloud cores
• On the Star Formation Efficiency of Turbulent Magnetized Clouds
• On the diversity and statistical properties of protostellar discs
• An ALMA Survey of Protoplanetary Disks in the $\sigma$ Orionis Cluster
• The VLA/ALMA Nascent Disk and Multiplicity (VANDAM) Survey of Orion Protostars. A Statistical Characterization of Class 0 and I Protostellar Disks
• Evolution of protoplanetary disks: Constraints from DM Tauri and GM Aurigae
• Magnetic processes in a collapsing dense core. I Accretion and Ejection
• Collapse of Magnetized Singular Isothermal Toroids: II. Rotation and Magnetic Braking
• On the Density Distribution in Star-forming Interstellar Clouds
• The impact of magnetic fields on single and binary star formation
• Why do protoplanetary disks appear not massive enough to form the known exoplanet population?
• Fossilized condensation lines in the Solar System protoplanetary disk
• Disk formation during collapse of magnetized protostellar cores
• Ambipolar diffusion in low-mass star formation. I. General comparison with the ideal MHD case
• Dust masses of young disks: constraining the initial solid reservoir for planet formation
• Four annular structures in a protostellar disk less than 500,000 years old
• The VLA Nascent Disk And Multiplicity Survey of Perseus Protostars (VANDAM). IV. Free-Free Emission from Protostars: Links to Infrared Properties, Outflow Tracers, and Protostellar Disk Masses
• A protostellar system fed by a streamer of 10,500 au length
• Protostellar collapse: radiative and magnetic feedbacks on small scale fragmentation
• Gravitational collapse of magnetized clouds. I. Ideal MHD accretion flow
• Turbulent Molecular Cloud Cores: Rotational Properties
• Protostellar Disk Formation Enabled by Removal of Small Dust Grains
• Collapse of a molecular cloud core to stellar densities: stellar core and outflow formation in radiation magnetohydrodynamics simulations
• Magnetic fields during the early stages of massive star formation - I. Accretion and disk evolution
• Effects of Ohmic and ambipolar diffusion on the formation and evolution of the first cores, protostars and circumstellar discs
• Does Magnetic Field-Rotation Misalignment Solve the Magnetic Braking Catastrophe in Protostellar Disk Formation?
• The influence of turbulence during magnetized core collapse and its consequences on low-mass star formation
• Turbulence-induced disc formation in strongly magnetised cloud cores
• Grain Growth and Density Distribution of the Youngest Protostellar Systems
• Complex Structure in Class 0 Protostellar Envelopes II: Kinematic Structure from Single-Dish and Interferometric Molecular Line Mapping
• Zoom-Simulations of Protoplanetary Disks starting from GMC scales
• Decoupling of Magnetic Fields in Collapsing Protostellar Envelopes and Disk Formation and Fragmentation
• N2H+(1-0) survey of massive molecular cloud cores
• Disc formation in turbulent massive cores: Circumventing the magnetic braking catastrophe
• The Mass Budget of Planet Forming Discs: Isolating the Epoch of Planetesimal Formation
• Episodic accretion: the interplay of infall and disc instabilities
• Magnetic fields during the early stages of massive star formation - II. A generalised outflow criterion
• Evidence for the start of planet formation in a young circumstellar disk
• PRODIGE -- Envelope to disk with NOEMA I. A 3000 au streamer feeding a Class I protostar
• Gravitational collapse of magnetized clouds II. The role of Ohmic dissipation
• Collapse of a molecular cloud core to stellar densities: the formation and evolution of pre-stellar discs
• Anisotropic Infall and Substructure formation in Embedded Disks
• There is no magnetic braking catastrophe: Low-mass star cluster and protostellar disc formation with non-ideal magnetohydrodynamics
• Observations of Infalling and Rotational Motions on a 1,000-AU Scale around 17 Class 0 and 0/I Protostars: Hints of Disk Growth and Magnetic Braking?
• OVRO N2H+ Observations of Class 0 Protostars: Constraints on the Formation of Binary Stars
• Misaligned disks induced by infall
• What determines the formation and characteristics of protoplanetary discs?
• Circumstellar disks and outflows in turbulent molecular cloud cores: possible formation mechanism for misaligned systems
• Effects of radiation transfer on the structure of self-gravitating disks, their fragmentation and evolution of the fragments
• The Bridge: a transient phenomenon of forming stellar multiples
• The early history of protostellar disks, outflows, and binary stars
• Characterizing magnetic field morphologies in three Serpens protostellar cores with ALMA
• Accretion and magnetic field morphology around Class 0 stage protostellar discs
• Spiral-driven accretion in protoplanetary discs - I. 2D models
• Are protoplanetary disks born with vortices? -- Rossby wave instability driven by protostellar infall
• The Effect of Misalignment between Rotation Axis and Magnetic Field on Circumstellar Disk
• Protostellar discs formed from turbulent cores
• From the CMF to the IMF: Beyond the Core-Collapse Model
• Protoplanetary disk birth in massive star forming clumps: the essential role of the magnetic field
• PRODIGE -- Envelope to Disk with NOEMA II. Small-scale temperature structure and a streamer feeding the SVS13A protobinary using CH3CN and DCN
• Disk Formation in Magnetized Dense Cores with Turbulence and Ambipolar Diffusion
• Accretion Flows or Outflow Cavities? Uncovering the Gas Dynamics around Lupus 3-MMS
• A cold accretion flow onto one component of a multiple protostellar system
• ALMA observations of the protostellar disk around the VeLLO IRAS 16253-2429
• Flow of gas detected from beyond the filaments to protostellar scales in Barnard 5
• Accretion driven turbulence in filaments II: Effects of self-gravity
• Accretion driven turbulence in filaments I: Non-gravitational accretion

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• Probing the Physics of Star-Formation (ProPStar): II. The first systematic search for streamers toward protostars
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