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Title: On the structure and stability of magnetic tower jets

Journal Article · · The Astrophysical Journal
 [1];  [1];  [1];  [2];  [3];  [4];  [4]
  1. Univ. of Rochester, Rochester, NY (United States)
  2. Univ. Pierre et Marie Curie, Meudon (France); Ecole Normale Superieure, Paris (France)
  3. Rice Univ., Houston, TX (United States)
  4. Imperial College, London (United Kingdom)

Modern theoretical models of astrophysical jets combine accretion, rotation, and magnetic fields to launch and collimate supersonic flows from a central source. Near the source, magnetic field strengths must be large enough to collimate the jet requiring that the Poynting flux exceeds the kinetic energy flux. The extent to which the Poynting flux dominates kinetic energy flux at large distances from the engine distinguishes two classes of models. In magneto-centrifugal launch models, magnetic fields dominate only at scales <~ 100 engine radii, after which the jets become hydrodynamically dominated (HD). By contrast, in Poynting flux dominated (PFD) magnetic tower models, the field dominates even out to much larger scales. To compare the large distance propagation differences of these two paradigms, we perform three-dimensional ideal magnetohydrodynamic adaptive mesh refinement simulations of both HD and PFD stellar jets formed via the same energy flux. We also compare how thermal energy losses and rotation of the jet base affects the stability in these jets. For the conditions described, we show that PFD and HD exhibit observationally distinguishable features: PFD jets are lighter, slower, and less stable than HD jets. Here, unlike HD jets, PFD jets develop current-driven instabilities that are exacerbated as cooling and rotation increase, resulting in jets that are clumpier than those in the HD limit. Our PFD jet simulations also resemble the magnetic towers that have been recently created in laboratory astrophysical jet experiments.

Research Organization:
Rice Univ., Houston, TX (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0000904
OSTI ID:
1334725
Journal Information:
The Astrophysical Journal, Vol. 757, Issue 1; ISSN 0004-637X
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 29 works
Citation information provided by
Web of Science

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Cited By (11)

Simulation of Nonrelativistic Jet Ejections During the Laboratory Studies journal April 2017
Dawes Review 6: The Impact of Companions on Stellar Evolution journal January 2017
Spectroscopic studies of the parameters of plasma jets during their propagation in the background plasma on the PF-3 facility journal February 2017
Transmission line analogy for relativistic Poynting-flux jets journal February 2013
On the triple-star origin of the planetary nebula Sh 2-71 journal August 2019
A synchrotron jet from a post-asymptotic giant branch star journal September 2013
Models of the Mass-ejection Histories of Pre-planetary Nebulae. III. The Shaping of Lobes by Post-AGB Winds journal May 2019
Models of the Mass-ejection Histories of Pre-planetary Nebulae. IV. Magnetized Winds and the Origins of Jets, Bullets, and FLIERs journal January 2020
Dawes Review 6: The Impact of Companions on Stellar Evolution journalarticle January 2017
Transmission Line Analogy for Relativistic Poynting-Flux Jets text January 2012
Models of the Mass-Ejection Histories of pre Planetary Nebulae, III. The Shaping of Lobes by post-AGB Winds text January 2019

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