The properties of the unique type Ib supernova 2005bf and implications for the difference between type Ib/c supernovae

Masaomi Tanaka, Nozomu Tominaga, Ken'Ichi Nomoto, Keiichi Maeda, Paolo A. Mazzali, Jingsong Deng

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The properties of the unique Type Ib supernova (SN) 2005bf are studied through the theoretical modeling of the early phase spectra and the light curve. The high velocity FeII lines in the earliest spectra are not the consequence of a jet-like explosion, but are naturally explained by a lower ionization state of Fe in the outermost layer due to the existence of the hydrogen. The velocities of the He lines measured from the position of the absorption minimum increase with time. Such a behavior is unprecedented, and can be understood if 56Ni is not fully mixed with the He layer. An increasing deposition of γ-rays in the He layer is necessary to produce more and more non-thermal electrons. Therefore it is also suggested that the C+O layer between 56Ni and the He layer is not very thick. The progenitors of Type Ib supernovae (SNe) and Type Ic SNe are briefly discussed by comparing SN 2005bf with other Type Ib/c SNe. We suggest that the mixig of 56Ni plays an important role to make the difference between Type Ib SNe and Type Ic SNe.

Original languageEnglish
Title of host publicationEnergy Budget in the High Energy Universe - Proceedings of the International Workshop
Pages369-372
Number of pages4
Publication statusPublished - 2007 Dec 1
Externally publishedYes
EventInternational Workshop on Energy Budget in the High Energy Universe - Kashiwa, Japan
Duration: 2006 Feb 222006 Feb 24

Publication series

NameEnergy Budget in the High Energy Universe - Proceedings of the International Workshop

Other

OtherInternational Workshop on Energy Budget in the High Energy Universe
CountryJapan
CityKashiwa
Period06/2/2206/2/24

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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