Classification of and recent research involving radiative shocks
- 128 Downloads
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.
KeywordsRadiative shocks High-power lasers Cooling function
Unable to display preview. Download preview PDF.
- Drake, R.P.: High Energy Density Physics: Fundamentals, Inertial Fusion and Experimental Astrophysics. Springer, Berlin (2006) Google Scholar
- Falize, E., Michaut, C., Bouquet, S., Cavet, C.: In: Bouvier, J., Chalabaev, A., Charbonnel, C. (eds.) SF2A-2007: Proc. of the Annual meeting of the French Society of Astronomy and Astrophysics, Grenoble, France, 2–6 July 2007, p. 469. EdP-Sciences (2008a). arXiv:0804.3238F
- Falize, E., Bouquet, S., Michaut, C.: In: Bouvier, J., Chalabaev, A., Charbonnel, C. (eds.) SF2A-2007: Proc. of the Annual meeting of the French Society of Astronomy and Astrophysics, Grenoble, France, 2–6 July 2007, p. 473. EdP-Sciences (2008b) Google Scholar
- Falize, E., Michaut, C., Cavet, C., Koenig, M., Loupias, B., Ravasio, A., Gregory, C.D., Bouquet, S.: Analytical structure of steady radiative shocks in magnetized cataclysmic variables. In: Proc. of HEDLA’08 held in St Louis, MO, USA, 12–15 April 2008. Accepted in Astrophys. Space Sci. (2008c) Google Scholar
- Falize, E., Bouquet, S., Michaut, C.: Scaling laws for radiative and magnetic fluids. In: Proc. of HEDLA’08 held in St Louis, MO, USA, 12–15 April 2008. Accepted in Astrophys. Space Sci. (2008d) Google Scholar
- Mihalas, D., Weibel-Mihalas, B.: Foundations of Radiation Hydrodynamics. Dover, New York (1999) Google Scholar
- Zeldovich, Y.B., Raizer, Y.P.: Physics of Shock Waves and High-Temperature Hydrodynamic Phenomena. Dover, New York (2002). Academic Press (1966) Google Scholar