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The “snow-plough” approximation is applied to the problem of the propagation of the shock wave from a nonsymmetrical supernova explosion in a uniform medium. The spherization of the shape of the remnant is obtained. The results are in good agreement with the observed properties of Cas A.
Modern development of particle physics makes it probable that new, still undiscovered, particles exist interacting with the ordinary matter by means of gravitation only. Okun suggested to call such particles the y-particles and to call the matter consisting of them the y-matter. We show that planet-like object orbiting inside the Sun and consisting of y-matter may explain 160 min nonradial solar oscillations.
The Supernova Working Group was re-established at the IAU XXV General Assembly in Sydney, 21 July 2003, sponsored by Commissions 28 (Galaxies) and 47 (Cosmology). Here we report on some of its activities since 2005.
We discuss a new scenario for the production of SNII explosion and present the results of numerical modelling studies of SNe II light curves which are being done in our group.
Exploding Neutron Star
The outburst of SN1987A has given a powerful impetus for theoretical work on the physical mechanism of supernova explosions. The one-dimensional theory of the SN mechanism has met certain difficulties in explaining the SN II explosion (see, e.g. Imshennik 1992a). Multidimensional effects might be required to resurrect the delayed explosion mechanism (Bethe & Wilson 1985), owing to neutrino heating (see contributions by Burrows 1993 and Janka 1993). Hillebrandt et al. (1990) have remarked that we may have to invent complicated scenarios in order to account for the explosions of massive stars, M = 20M⊙. We discuss here a bizarre scenario proposed by Imshennik (1992b), where the interested reader can find further details. Here we give only a brief sketch of the main idea and report on the present status of the project.
In the suggested scenario (Imshennik 1992b), the decisive role is played by the rotation of a presupernova core. The idea to connect an SN explosion with the fission instability in a rapidly rotating collapsing star was first put forward by von Weizsäcker (1947). Shklovsky (1970) had also pointed out the possible importance of the rotational instability for type II SNe. Those ideas were expressed in quite general form.
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