Core-collapse supernovae (CC-SNe) show a large variety in their observational properties. Their peak luminosities range from MV ∼ -14 mag to ∼ -21 mag. The 'faint' and 'bright' SNe show diversities even within the individual luminosity classes. Faint SNe include SNe IIp, peculiar SNe Ib 2005E/2005cz, and even more peculiar SN 2008ha. For this faint class, we propose a scenario that they are outcomes of a low-energy explosion of a star with the main-sequence mass, MZAMS, in the range of ∼ 8 ∼ 5M. Bright SNe also show diversities in their light curves and spectra. SN Ic 2007bi is the most solid case in which a large amount of 56Ni, ∼ 5 - 10M, is ejected. We show that not only a pair-instability SN (MZAMS ∼ 200 300M) but also an Fe-core-collapse SN (MZAMS ∼ 100M) can reproduce its observed behaviors. Finally, the diversity in the luminosity of SNe associated with Gamma-ray bursts is discussed.We suggest that a variety in the jet-induced mechanism (i.e., the duration for which the engine works) as a possible cause of the observed diversity.
|ジャーナル||Memorie della Societa Astronomica Italiana, Supplementi - Journal of the Italian Astronomical Society, Supplement|
|出版ステータス||Published - 2012|
|イベント||Workshop on Multifrequency Behaviour of High Energy Cosmic Sources - Vulcano, Sicily, Italy|
継続期間: 2011 5月 23 → 2011 5月 28
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