On the possibility of a two-bang supernova collapse View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1988-05

AUTHORS

V. S. Berezinsky, C. Castagnoli, V. I. Dokuchaev, P. Galeotti

ABSTRACT

The possibility of a two-bang stellar collapse originating SN 1987a, and having the characteristics of the events recorded in Mont Blanc and Kamiokande, is discussed here. According to the «standard» collapse models of nonrotating stars, which predict the formation of a neutrinosphere with a nondegenerate neutrino gas inside the star, the Mont Blanc and Kamiokande data for the first burst give a too large stellar mass. On the contrary, a degenerate neutrino gas with low temperatureT≈0.5 MeV, and chemical potential μ≈(12÷15), predicts a relatively low total energy outflowWν≈(2÷6)·1054 erg, and a small number of expected interactions in Kamiokande. A possible scenario is suggested: a massive (M≈20M⊙) rotating star is fragmented into two pieces, one light and the other heavy, at the onset of the collapse. The massive component collapses to a black hole, and produces the first burst. Neutrinos are trapped inside the collapsing star because of elastic scattering in the outer core off heavy nuclei, withA≳300. It is shown that neutrinos fill up the quantum states, producing a degenerate neutrino gas. The second burst is explained by coalescence of the light fragment (M≈(1÷3)M⊙) onto the massive black hole. The time delay between the two observed bursts (4.7 h) is mostly connected with gravitational braking, when the light fragment falls down onto the black hole, with an accompanying emission of gravitational waves for times of order of hours. More... »

PAGES

287-303

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02507914

DOI

http://dx.doi.org/10.1007/bf02507914

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1024853661


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