The peculiar Type Ib supernova 2006jc: A WCO wolf-rayet star explosion

N. Tominaga, M. Limongi, T. Suzuki, M. Tanaka, K. Nomoto, K. Maeda, A. Chieffi, A. Tornambe, T. Minezaki, Y. Yoshii, I. Sakon, T. Wada, Y. Ohyama, T. Tanabé, H. Kaneda, T. Onaka, T. Nozawa, T. Kozasa, K. S. Kawabata, G. C. AnupamaD. K. Sahu, U. K. Gurugubelli, T. P. Prabhu, J. Deng

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

We present a theoretical model for Type Ib supernova (SN ) 2006jc. We calculate the evolution of the progenitor star, hydrodynamics and nucleosynthesis of the SN explosion, and the SN bolometric light curve (LC). The synthetic bolometric LC is compared with the observed bolometric LC constructed by integrating the UV, optical, near-infrared (NIR), and mid-infrared (MIR) fluxes. The progenitor is assumed to be as massive as 40 M on the zero-age main sequence. The star undergoes extensive mass loss to reduce its mass down to as small as 6.9 M, thus becoming a WCO Wolf-Rayet star. The WCO star model has a thick carbon-rich layer, in which amorphous carbon grains can be formed. This could explain the NIR brightening and the dust feature seen in the MIR spectrum. We suggest that the progenitor of SN 2006jc is a WCO Wolf-Rayet star having undergone strong mass loss, and such massive stars are important sites of dust formation. We derive the parameters of the explosion model in order to reproduce the bolometric LC of SN 2006jc by the radioactive decays: the ejecta mass 4.9 M, hypernova-like explosion energy 1052 ergs, and ejected 56Ni mass 0.22 M. We also calculate the circumstellar interaction and find that a CSM with a flat density structure is required to reproduce the X-ray LC of SN 2006jc. This suggests a drastic change of the massloss rate and/or the wind velocity that is consistent with the past luminous blue variable (LBV)-like event.

Original languageEnglish
Pages (from-to)1208-1219
Number of pages12
JournalAstrophysical Journal
Volume687
Issue number2
DOIs
Publication statusPublished - 2008 Nov 10
Externally publishedYes

Keywords

  • Dust, extinction
  • Infrared: ISM
  • Nuclear reactions, nucleosynthesis, abundances
  • Stars: Wolf-Rayet
  • Supernovae: general
  • Supernovae: individual (SN 2006jc)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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