Richtmyer-Meshkov Experiments on the Omega Laser

Hueckstaedt, R. M.; Batha, S. H.; Balkey, M. M.; Delamater, N. D.; Fincke, J. R.; Holmes, Richard; Lanier, N. E.; Magelssen, G. R.; Scott, J. M.; Taccetti, J. M.; Horsfield, C. J.; Parker, Kenneth; Rothman, S. D.

doi:10.1007/pl00021737

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…It includes a flux-limited diffusion scheme to model the transport of thermal photons using the Levermore-Pomraning flux limiter (Levermore & Pomraning 1981). RAGE has been extensively tested on a range of verification problems (Holmes et al 1999;Hueckstaedt et al 2005) and applied to (and tested on) a range of astrophysics problems (Herwig et al 2006;Coker et al 2006;Fryer et al 2007a,b), including the strong velocity gradients that exist in supernova explosions (Lowrie & Rauenzahn 2006).…”

Section: Code Descriptionmentioning

confidence: 99%

Spectra and Light Curves of Failed Supernovae

Fryer

Brown

Bufano

et al. 2009

ApJ

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Astronomers have proposed a number of mechanisms to produce supernova explosions. Although many of these mechanisms are now not considered primary engines behind supernovae, they do produce transients that will be observed by upcoming ground-based surveys and NASA satellites. Here we present the first radiation-hydrodynamics calculations of the spectra and light curves from three of these "failed" supernovae: supernovae with considerable fallback, accretion induced collapse of white dwarfs, and energetic helium flashes (also known as type .Ia supernovae).

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Section: Code Descriptionmentioning

confidence: 99%

Spectra and Light Curves of Failed Supernovae

Fryer

Brown

Bufano

et al. 2009

ApJ

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“…The conservation equations for mass, momentum, and total energy are solved through a secondorder, direct-Eulerian Godunov method on a finite-volume mesh (Gittings et al 2006). RAGE has been extensively tested on verification problems (K. Belle et al 2006, in preparation;Holmes et al 1999;Hueckstaedt et al 2005). The code has the capability for continuous adaptive mesh refinement to increase spatial resolution in areas of interest with a minimal increase in computational time.…”

Section: Hydrodynamics Codementioning

confidence: 99%

Hydrodynamic Simulations of He Shell Flash Convection

Herwig

Freytag

Hueckstaedt

et al. 2006

ApJ

105

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We present the first hydrodynamic, multidimensional simulations of He shell flash convection. We investigate the properties of shell convection immediately before the He luminosity peak during the 15th thermal pulse of a stellar evolution track with initially 2 solar masses and metallicity Z ¼ 0:01. This choice is a representative example of a low-mass asymptotic giant branch thermal pulse. We construct the initial vertical stratification with a set of polytropes to resemble the stellar evolution structure. Convection is driven by a constant volume heating in a thin layer at the bottom of the unstable layer. We calculate a grid of two-dimensional simulations with different resolutions and heating rates, plus one low-resolution three-dimensional run. The flow field is dominated by large convective cells that are centered in the lower half of the convection zone. It generates a rich spectrum of gravity waves in the stable layers both above and beneath the convective shell. The magnitude of the convective velocities from our one-dimensional mixing-length theory model and the rms-averaged vertical velocities from the hydrodynamic model are consistent within a factor of a few. However, the velocity profile in the hydrodynamic simulation is more asymmetric and decays exponentially inside the convection zone. Both g-modes and convective motions cross the formal convective boundaries, which leads to mixing across the boundaries. Our resolution study shows consistent flow structures among the higher resolution runs, and we see indications for convergence of the vertical velocity profile inside the convection zone for the highest resolution simulations. Many of the convective properties, in particular the exponential decay of the velocities, depend only weakly on the heating rate. However, the amplitudes of the gravity waves increase with both the heating rate and the resolution.

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“…It includes a flux-limited diffusion scheme to model the transport of photons using the Levermore-Pomraning flux limiter (Levermore & Pomraning 1991). RAGE has been extensively tested on a range of verification problems (Holmes et al 1999;Hueckstaedt et al 2005) and applied to (and tested on) a range of astrophysics problems (Herwig et al 2006;Coker et al 2006;Fryer et al 2007), including the strong velocity gradients that exist in supernova explosions (Lowrie & Rauenzahn 2006).…”

Section: Initial Conditions and Code Descriptionmentioning

confidence: 99%

Light-Curve Calculations of Supernovae from Fallback Gamma-Ray Bursts

Fryer

Hungerford

Young

2007

ApJ

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The currently-favored model for long-duration gamma-ray bursts (GRBs) invokes explosions from the collapse of a massive star down to a black hole: either directly or through fallback. Those GRBs forming via fallback will produce much less radioactive nickel, and hence it has been argued (without any real calculation) that these systems produce dim supernovae. These fallback blackhole GRBs have been recently been argued as possible progenitors of a newly discovered set of GRBs lacking any associated supernovae. Here we present the first ever radiation-hydrodynamics calculations of the light-curves produced in the hypernova explosion by a delayed-fallback gamma-ray burst. We find that the bolometric light-curve is dominated by shock-deposited energy, not the decay of radioactive elements. As such, observations of such bursts actually probe the density in the progenitor wind more than it does the production of radioactive nickel.

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Richtmyer-Meshkov Experiments on the Omega Laser

Cited by 4 publications

References 4 publications

Spectra and Light Curves of Failed Supernovae

Spectra and Light Curves of Failed Supernovae

Hydrodynamic Simulations of He Shell Flash Convection

Light-Curve Calculations of Supernovae from Fallback Gamma-Ray Bursts

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