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For refcode 1995MNRAS.277..106C:
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Copyright by Royal Astronomical Society. 1995MNRAS.277..106C SN 1986E eight years after outburst: a link to SN 1957P? E. Cappellaro, I. J. Danziger and M. Turatto Osservatorio Astronomico di Padova, vico/o dell'Osservatorio 5, I-35122 Padova, Italy European Southern Observatory, Karl-Schwarrschild-Strasse 2, D-85748 Garching bei Munchen, Germany Accepted 1995 May 22. Received 1995 May 19; in original form 1994 December 29 ABSTRACT We report on the optical recovery of SN 1986E, 7.1 and 7.9 yr after explosion. The spectra are dominated by broad H{alpha} and [O I] {lambda}{lambda}6300, 6364 emission lines with a minor contribution from [Ca II] {lambda}{lambda}7291, 7324 and, possibly, [Fe II] {lambda}7155. Compared with the spectra of the other recovered SNII, SN 1986E shows strong H{alpha} luminosity similar to SN 1979C, but, in contrast, weak [O III] emission. So far, among classified supernovae (SNe), only type II liners have been recovered a few years past the explosion. The high optical luminosity of linear SNII at this phase is most likely related to the interaction of the ejecta with the circumstellar wind, which is also expected to produce strong radio emission. Therefore radio observations of the remnant of SN 1986E are worth attempting. The circumstellar interaction model predicts that, in the next decade, the strength of the [O III]/H{alpha} emission rapidly increases and that [O III] {lambda}{lambda}4959, 5007 should eventually dominate the spectrum. We observed this effect in SN 1957D 30 yr after explosion, and it may therefore represent the normal evolution of SNII with a dense circumstellar medium. The details observed in the spectra of both SNe suggest directions for further refinement of the modelling. Key words: circumstellar matter - supernovae: general - supernovae: individual: SN 1986E - supernova remnants.
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