The role of thermal pressure in jet launching
arXiv:0706.4241 · doi:10.1017/S1743921307009556
Abstract
I present and discuss a unified scheme for jet launching that is based on stochastic dissipation of the accretion disk kinetic energy, mainly via shock waves. In this scheme, termed thermally-launched jet model, the kinetic energy of the accreted mass is transferred to internal energy, e.g., heat or magnetic energy. The internal energy accelerates a small fraction of the accreted mass to high speeds and form jets. For example, thermal energy forms a pressure gradient that accelerates the gas. A second acceleration stage is possible wherein the primary outflow stretches magnetic field lines. The field lines then reconnect and accelerate small amount of mass to very high speeds. This double-stage acceleration process might form highly relativistic jets from black holes and neutron stars. The model predicts that detail analysis of accreting brown dwarfs that launch jets will show the mass accretion rate to be larger than 10^{-9}-10^{-8} Mo/year, which is higher than present claims in the literature.
arXiv commentTo appear in the proceedings of Star-disk interaction in young stars, Grenoble 2007, ed. J. Bouvier
References in corpus (14)
- Magnetically Driven Accretion Flows in the Kerr Metric I: Models and Overall Structure
- The T Tauri Phase Down to Nearly Planetary Masses: Echelle Spectra of 82 Very Low Mass Stars and Brown Dwarfs
- The Dynamical Structure of Nonradiative Black Hole Accretion Flows
- Magnetically Driven Accretion in the Kerr Metric III: Unbound Outflows
- A resolved outflow of matter from a Brown Dwarf
- Global Three-Dimensional Simulations of Black Hole Accretion Disks: X-ray Flares in the Plunging Region
- Relativistic Magnetohydrodynamics with Application to Gamma-Ray Burst Outflows: II. Semianalytic Super-Alfvenic Solutions
- Stationary accretion disks launching super fast-magnetosonic MHD jets
- Discovery of a Bipolar Outflow from 2MASSW J1207334-393254, A 24 Jupiter Mass Brown Dwarf
- Magneto-Centrifugal Launching of Jets from Accretion Disks. II: Inner Disk-Driven Winds
- Variable accretion and outflow in young brown dwarfs
- Neutron-Rich Hydromagnetic Outflows in Gamma-Ray Burst Sources
- Launching jets from the boundary layer of accretion disks in young stellar objects
- Constraining jet theories using nova outbursts