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    Nickel, argon and cobalt in the infrared spectrum of SN1987A: the core becomes visible

    Infrared spectra of supernova 1987A taken in April and November 1987 from the Kuiper Airborne Observatory (KAO) show two distinctly different stages in the evolution of the expanding gas shell. In April both t...

    D. M. Rank, P. A. Pinto, S. E. Woosley, J. D. Bregman, F. C. Wittebornt in Nature (1988)