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Featured researches published by B.H. Wilde.


The Astrophysical Journal | 2011

FLUID DYNAMICS OF STELLAR JETS IN REAL TIME: THIRD EPOCH HUBBLE SPACE TELESCOPE IMAGES OF HH 1, HH 34, AND HH 47

Patrick Hartigan; Adam Frank; J. M. Foster; B.H. Wilde; M.R. Douglas; Paula A. Rosen; Robert Francis Coker; B.E. Blue; J. F. Hansen

We present new, third-epoch Hubble Space Telescope H? and [S II] images of three Herbig-Haro (HH) jets (HH?1&2, HH?34, and HH?47) and compare the new images with those from previous epochs. The high spatial resolution, coupled with a time series whose cadence is of order both the hydrodynamic and radiative cooling timescales of the flow, allows us to follow the hydrodynamic/magnetohydrodynamic evolution of an astrophysical plasma system in which ionization and radiative cooling play significant roles. Cooling zones behind the shocks are resolved, so it is possible to identify which way material flows through a given shock wave. The images show that heterogeneity is paramount in these jets, with clumps dominating the morphologies of both bow shocks and their Mach disks. This clumpiness exists on scales smaller than the jet widths and determines the behavior of many of the features in the jets. Evidence also exists for considerable shear as jets interact with their surrounding molecular clouds, and in several cases we observe shock waves as they form and fade where material emerges from the source and as it proceeds along the beam of the jet. Fine structure within two extended bow shocks may result from Mach stems that form at the intersection points of oblique shocks within these clumpy objects. Taken together, these observations represent the most significant foray thus far into the time domain for stellar jets, and comprise one of the richest data sets in existence for comparing the behavior of a complex astrophysical plasma flow with numerical simulations and laboratory experiments.


The Astrophysical Journal | 2016

WHEN SHOCK WAVES COLLIDE

Patrick Hartigan; J. M. Foster; Adam Frank; E. Hansen; K. Yirak; Andy Liao; Peter Graham; B.H. Wilde; B.E. Blue; D. Martinez; Paula A. Rosen; D. Farley; R. Paguio

Supersonic outflows from objects as varied as stellar jets, massive stars and novae often exhibit multiple shock waves that overlap one another. When the intersection angle between two shock waves exceeds a critical value, the system reconfigures its geometry to create a normal shock known as a Mach stem where the shocks meet. Mach stems are important for interpreting emission-line images of shocked gas because a normal shock produces higher postshock temperatures and therefore a higher-excitation spectrum than an oblique one does. In this paper we summarize the results of a series of numerical simulations and laboratory experiments designed to quantify how Mach stems behave in supersonic plasmas that are the norm in astrophysical flows. The experiments test analytical predictions for critical angles where Mach stems should form, and quantify how Mach stems grow and decay as intersection angles between the incident shock and a surface change. While small Mach stems are destroyed by surface irregularities and subcritical angles, larger ones persist in these situations, and can regrow if the intersection angle changes to become more favorable. The experimental and numerical results show that although Mach stems occur only over a limited range of intersection angles and size scales, within these ranges they are relatively robust, and hence are a viable explanation for variable bright knots observed in HST images at the intersections of some bow shocks in stellar jets.


The Astrophysical Journal | 2005

High-Energy-Density, Laboratory-Astrophysics Studies of Jets and Bow Shocks

J. M. Foster; B.H. Wilde; Paula A. Rosen; R. J. R. Williams; B. E. Blue; Robert Francis Coker; R. P. Drake; Adam Frank; P. A. Keiter; Alexei M. Khokhlov; J. P. Knauer; T. S. Perry


Astrophysics and Space Science | 2005

Recent Experimental Results and Modelling of High-Mach-Number Jets and the Transition to Turbulence

Paula A. Rosen; B.H. Wilde; R. J. R. Williams; J. M. Foster; P. A. Keiter; Robert Francis Coker; T. S. Perry; M.J. Taylor; Alexei M. Khokhlov; R. P. Drake; Guy R. Bennett; Daniel Brian Sinars; Robert B. Campbell


High Energy Density Physics | 2013

Mach stem hysteresis: Experiments addressing a novel explanation of clumpy astrophysical jet emission

K. Yirak; J. M. Foster; Patrick Hartigan; B.H. Wilde; M.R. Douglas; R. Paguio; B.E. Blue; D. Martinez; D. Farley; Paula A. Rosen; Adam Frank


High Energy Density Physics | 2010

Laboratory astrophysics and non-ideal equations of state: the next challenges for astrophysical MHD simulations

R. Carver; Andrew J. Cunningham; Adam Frank; Patrick Hartigan; Robert Francis Coker; B.H. Wilde; J. M. Foster; Paula A. Rosen


Journal De Physique Iv | 2006

Laboratory-astrophysics jet experiments at the omega laser facility

Paula A. Rosen; J. M. Foster; R. J. R. Williams; B.H. Wilde; Robert Francis Coker; B. E. Blue; T. S. Perry; Patrick Hartigan; R. P. Drake; K. Dannenberg; Alexei M. Khokhlov; Adam Frank; J. P. Knauer


Third International Conference on Inertial Fusion Sciences and Applications, IFSA 2003 | 2004

Transition to turbulence in plasma jet experiments

Mark Taylor; J. M. Foster; Paula A. Rosen; R. J. R. Williams; B.H. Wilde; T.S. Perry; P. A. Keiter; Robert Francis Coker; R. P. Drake; Alexei M. Khokhlov


Bulletin of the American Physical Society | 2010

Laboratory experiments of supersonic flows through clumpy environments

M.R. Douglas; B.H. Wilde; B.E. Blue; J. F. Hansen; J. M. Foster; Paula A. Rosen; R. J. R. Williams; Patrick Hartigan; Adam Frank


Bulletin of the American Physical Society | 2009

Supersonic flow through clumpy environments: simulations and experiments

M.R. Douglas; B.H. Wilde; B.E. Blue; J. F. Hansen; J. M. Foster; Paula A. Rosen; R. J. R. Williams; Patrick Hartigan; Adam Frank

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Paula A. Rosen

Atomic Weapons Establishment

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J. M. Foster

Atomic Weapons Establishment

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Robert Francis Coker

Los Alamos National Laboratory

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R. J. R. Williams

Atomic Weapons Establishment

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Adam Frank

University of Rochester

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J. F. Hansen

Lawrence Livermore National Laboratory

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