NDLI: Classification of and recent research involving radiative shocks

Content Provider	Springer Nature Link
Author	Michaut, C. Falize, E. Cavet, C. Bouquet, S. Koenig, M. Vinci, T. Reighard, A. Drake, R. P.
Copyright Year	2008
Abstract	Radiative shocks (RS) occur in astrophysical systems and in high-energy density laboratory experiments. Aided by three dimensionless parameters, we propose a classification of RS into four types, integrating previous work that has focused independently on optical depth and on Mach number. Specific terms, such as a cooling function, a radiative flux, or radiative energy and pressure must be added to the Euler equations in order to model these various kinds of shocks. We examine how these terms correspond to the radiative classification regimes. In astrophysics, observed RS arise generally in optically thin material. Thus, radiation escapes without interaction with the surrounding gas, except perhaps to ionize it, and the energy loss in such shocks can be modeled by a cooling function Λ. In this case only the post-shock region is structured by the radiation cooling. We found the analytical solution for hydrodynamic equations including Λ∝ ρ ε P ζ x θ for arbitrary values of ε, ζ, θ. This is a completely new result. An application of this calculation for the accretion shock in cataclysmic variables of polar type is given in astrophysical terms. We also draw a parallel between RS experiments performed using the LULI2000 laser facility, in France and the Omega laser Facility, in USA. RS developed in these laboratories are more or less optically thick. These high-Mach number RS present a radiative precursor.
Starting Page	77
Ending Page	84
Page Count	8
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	322
Issue Number	1-4
e-ISSN	1572946X
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-12-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radiative shocks High-power lasers Cooling function Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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