Abstract
The possibility of simulating the processes during supernova explosions in laboratory conditions using powerful lasers (laboratory astrophysics) is investigated. The Chandra observations of ejecta in the Cassiopeia A supernova remnant are analyzed. Based on the DIANA and NUTCY numerical codes, we have performed 1D and 2D hydrodynamic simulations of the ejecta expansion dynamics for a supernova with a mass of ∼5–15 solar masses within several hundred seconds after its explosion, including an initial asymmetry. We propose a model for the explosion and expansion of ejecta that illustrates strong inhomogeneities in the distribution of material to the extent that the Fe, Si, and S material from the stellar center turns out to be ejected to the periphery, the “star turns inside out,” in agreement with observations. Based on hydrodynamic similarity criteria, we consider possible supernova-simulating laser targets that will allow one to reproduce the physical processes that take place during the explosion of an astrophysical object, such as the shock propagation through the material, the growth of hydrodynamic instabilities at the boundaries of envelopes with different densities, etc.
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Original Russian Text © N.V. Zmitrenko, V.B. Rozanov, R.V. Stepanov, R.A. Yakhin, V.S. Belyaev, 2014, published in Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2014, Vol. 145, No. 3, pp. 442–454.
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Zmitrenko, N.V., Rozanov, V.B., Stepanov, R.V. et al. Ejection of heavy elements from the stellar core to the periphery of the cloud of ejecta during a supernova explosion: A possible model of the processes. J. Exp. Theor. Phys. 118, 384–394 (2014). https://doi.org/10.1134/S1063776114030200
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DOI: https://doi.org/10.1134/S1063776114030200