Modeling disks and magnetic outflows around a forming massive star: II. Dynamics of jets from massive protostars

Abstract

Forming massive stars launch outflows of magnetic origin, which in fact serve as a marker for finding sites of massive star formation. However, both the theoretical and observational study of the mechanisms that intervene in the formation and propagation of such outflows has been possible only until recent years. With this work, we aim to study in detail the mechanisms that drive highly collimated outflows from early stages of the formation of a massive star, and how those processes are impacted by the properties of the natal environment of the forming massive star. We perform a series of 31 simulations with the aim of building a unified theoretical picture of these mechanisms, and see how the impact of different environments alter their morphology and momentum output. The magnetohydrodynamical simulations consider also Ohmic dissipation as a nonideal effect, self-gravity, and diffusive radiation transport for thermal absorption and emission by the dust and gas. We start from a collapsing cloud core that is threaded by an initially-uniform magnetic field and which is slowly rotating. We utilize a two-dimensional axisymmetric grid in spherical coordinates. In the simulations, we can clearly distinguish a fast, magneto-centrifugally launched and collimated jet (of speeds > 100 km/s), from a wider magnetic tower flow driven by magnetic pressure which broadens in time. We analyze in detail the acceleration of the flow, and its re-collimation by magnetic forces happening at distances of several hundreds of astronomical units. We quantify the impact of magnetic braking in the outflows, which narrows the outflow cavity for the late evolution of the system. We observe the presence of the same jet-driving mechanisms for a wide range of assumptions on the natal environment of the massive protostar, but with changes to their morphology and mechanical feedback into larger scales over time.

Accepted for publication in Astronomy & Astrophysics

References in corpus (25)

• PLUTO: a Numerical Code for Computational Astrophysics
• 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
• A Magnetized Jet from a Massive Protostar
• The Fragmentation of Magnetized, Massive Star-Forming Cores with Radiative Feedback
• Magnetic Fields and Rotations of Protostars
• Gravitational collapse of magnetized clouds. I. Ideal MHD accretion flow
• The Role of Outflows, Radiation Pressure, and Magnetic Fields in Massive Star Formation
• A String of Radio Emission Associated with IRAS 16562-3959: A Collimated Jet Emanating from a Luminous Massive YSO
• Constraining MHD disk winds with ALMA. Apparent rotation signatures and application to HH212
• The Highly Collimated Radio Jet of HH 80-81: Structure and Non-Thermal Emission
• An Early Transition to Magnetic Supercriticality in Star Formation
• Protostellar Outflows at the EarliesT Stages (POETS). II. A possible radio synchrotron jet associated with the EGO G035.02+0.35
• A Galactic survey of radio jets from massive protostars
• An optical parsec-scale jet from a massive young star in the Large Magellanic Cloud
• Makemake + Sedna: A Continuum Radiation Transport and Photoionization Framework for Astrophysical Newtonian Fluid Dynamics
• HST-Scale 3D simulations of MHD disc winds : A rotating two-component jet structure
• Multi-scale view of star formation in IRAS 21078+5211: From clump fragmentation to disk wind
• Snapshot of a magnetohydrodynamic disk wind traced by water maser observations
• ALMA observations of the Th 28 protostellar disk - A new example of counter-rotation between disk and optical jet
• Modeling disks and magnetic outflows around a forming massive star: I. Investigating the two layer-structure of the accretion disk
• Zooming into the Collimation Zone in a Massive Protostellar Jet
• Fast methods to track grain coagulation and ionization. II. Extension to thermal ionization
• A Multi-Epoch Study of Radio Continuum Emission from MassiveProtostars
• Counter-rotation in relativistic magnetohydrodynamic jets

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• Monitoring of the polarized $H_{2}O$ maser emission around the massive protostars W75N(B)-VLA1 and W75N(B)-VLA2
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• Gas infall via accretion disk feeding Cepheus A HW2
• Protostellar Outflows at the EarliesT Stages (POETS) V. The launching mechanism of protostellar winds via water masers
• A probable Keplerian disk feeding an optically revealed massive young star
• The magnetic field of a magnetohydrodynamic disk wind: Water maser observations and simulations
• Evolutionary models for the Very Massive Stars in the R136 cluster of 30 Doradus in the Large Magellanic Cloud
• Chemical evolution of close massive binaries -- tidally-enhanced or tidally-suppressed mixing?
• The Impact of Silicate Grain Coagulation on Millimeter Emission from Massive Protostellar Disks
• On the origin of the rotation of massive stars