An origin of arc structures deeply embedded in dense molecular cloud cores

Abstract

We investigated the formation of arc-like structures in the infalling envelope around protostars, motivated by the recent Atacama Large Millimeter/Submillimeter Array (ALMA) observations of the high-density molecular cloud core, MC27/L1521F. We performed self-gravitational hydrodynamical numerical simulations with an adaptive mesh refinement code. A filamentary cloud with a 0.1~pc width fragments into cloud cores because of perturbations due to weak turbulence. The cloud core undergoes gravitational collapse to form multiple protostars, and gravitational torque from the orbiting protostars produces arc structures extending up to a 1000~AU scale. As well as on a spatial extent, the velocity ranges of the arc structures, $\sim 0.5{\mathrm{km}\mathrm{s}}^{-1}$, are in agreement with the ALMA observations. We also found that circumstellar disks are often misaligned in triple system. The misalignment is caused by the tidal interaction between the protostars when they undergo close encounters because of a highly eccentric orbit of the tight binary pair.

arXiv comment5 pages, 4 figures, accepted for publication in MNRAS

References in corpus (20)

• From filamentary clouds to prestellar cores to the stellar IMF: Initial highlights from the Herschel Gould Belt survey
• Characterizing interstellar filaments with Herschel in IC5146
• Cores, filaments, and bundles: hierarchical core formation in the L1495/B213 Taurus region
• Massive star formation: Nurture, not nature
• The Formation Mechanism of Brown Dwarfs
• Radiation Magnetohydrodynamic Simulations of Protostellar Collapse: Protostellar Core Formation
• Simulating star formation in molecular cloud cores I. The influence of low levels of turbulence on fragmentation and multiplicity
• The Spitzer c2d Survey of Nearby Dense Cores: II: Discovery of a Low Luminosity Object in the "Evolved Starless Core" L1521F
• Collapse and Fragmentation of Rotating Magnetized Clouds. II. Binary Formation and Fragmentation of First Cores
• Misaligned Protoplanetary Disks in a Young Binary System
• TURBULENCE IN MOLECULAR CLOUDS
• Self-gravitational Magnetohydrodynamics with Adaptive Mesh Refinement for Protostellar Collapse
• Spatially resolved mid-infrared observations of the triple system T Tauri
• Magnetically Controlled Spasmodic Accretion During Star Formation. II. Results
• ALMA observations of a high-density core in Taurus: dynamical gas interaction at the possible site of a multiple star formation
• ALMA Observations of the T Tauri Binary System AS 205: Evidence for Molecular Winds and/or Binary Interactions
• ALMA observations of a misaligned binary protoplanetary disk system in Orion
• Magnetic Flux Expulsion in Star Formation
• Evidence for Misaligned Disks in the T Tauri Triple System: 10 um Super-Resolution with MMTAO and Markov Chains
• Protostellar collapse of magneto-turbulent cloud cores: shape during collapse and outflow formation

Cited by in corpus (18)

• Seeds Of Life In Space (SOLIS): The organic composition diversity at 300--1000 au scale in Solar-type star forming regions
• Circumstellar disks and outflows in turbulent molecular cloud cores: possible formation mechanism for misaligned systems
• FRagmentation and Evolution of dense cores Judged by ALMA (FREJA). I (Overview). Inner $\sim$1000 au structures of prestellar/protostellar cores in Taurus
• Revealing a detailed mass distribution of a high-density core MC27/L1521F in Taurus with ALMA
• A cold accretion flow onto one component of a multiple protostellar system
• Warm CO gas generated by possible turbulent shocks in a low-mass star-forming dense core in Taurus
• Misaligned Twin Molecular Outflows From Class-0 Proto-stellar Binary System VLA 1623A Unveiled by ALMA
• Structure of a protobinary system: an asymmetric circumbinary disk and spiral arms
• Crescent-Shaped Molecular Outflow from the Intermediate-mass Protostar DK Cha Revealed by ALMA
• A Detached Protostellar Disk around a $\sim$0.2$M_{\odot }$ protostar in a Possible Site of a Multiple Star Formation in a Dynamical Environment in Taurus
• Triple spiral arms of a triple protostar system imaged in molecular lines
• Twin Jets and Close Binary Formation
• Formation of the Unequal-Mass Binary Protostars in L1551 NE by Rotationally-Driven Fragmentation
• Seeds of Life in Space (SOLIS).VII. Discovery of a cold dense methanol blob toward the L1521F VeLLO system
• Discovery of Asymmetric Spike-like Structures of the 10 au Disk around the Very Low-luminosity Protostar Embedded in the Taurus Dense Core MC 27/L1521F with ALMA
• Misaligned Circumstellar Disks and Orbital Motion of the Young Binary XZ Tau
• ALMA Band 9 CO(6--5) Reveals a Warm Ring Structure Associated with the Embedded Protostar in the Cold Dense Core MC 27/L1521F
• A new formation scenario of a counter-rotating circumstellar disk: spiral-arm accretion from a circumbinary disk in a triple protostar system