Type Ib supernova 2008D associated with the luminous X-ray transient 080109: An energetic explosion of a massive helium star

Masaomi Tanaka, Nozomu Tominaga, Ken'ichi Nomoto, S. Valenti, D. K. Sahu, T. Minezaki, Y. Yoshii, M. Yoshida, G. C. Anupama, S. Benetti, G. Chincarini, M. Della Valle, P. A. Mazzali, E. Pian

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66 Citations (Scopus)

Abstract

We present a theoretical model for supernova SN 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modeled based on the progenitor models and the explosion models obtained from hydrodynamic/nucleosynthetic calculations. We find that SN 2008D is a more energetic explosion than normal core-collapse supernovae, with an ejecta mass of Mej = 5.3 ± 1.0M and a kinetic energy of EK = 6.0 ± 2.5 × 1051 erg. The progenitor star of the SN has a 6-8 M He core with essentially no H envelope (< 5 × 10-4M) prior to the explosion. The main-sequence mass of the progenitor is estimated to be MMS = 20-25M, with additional systematic uncertainties due to convection, mass loss, rotation, and binary effects. These properties are intermediate between those of normal SNe and hypernovae associated with gamma-ray bursts. The mass of the central remnant is estimated as 1.6-1.8 M, which is near the boundary between neutron star and black hole formation.

Original languageEnglish
Pages (from-to)1131-1142
Number of pages12
JournalAstrophysical Journal
Volume692
Issue number2
DOIs
Publication statusPublished - 2009 Feb 20
Externally publishedYes

Keywords

  • Nuclear reactions, nucleosynthesis, abundances
  • Radiative transfer
  • Supernovae: general
  • Supernovae: individual (SN 2008D)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Tanaka, M., Tominaga, N., Nomoto, K., Valenti, S., Sahu, D. K., Minezaki, T., Yoshii, Y., Yoshida, M., Anupama, G. C., Benetti, S., Chincarini, G., Della Valle, M., Mazzali, P. A., & Pian, E. (2009). Type Ib supernova 2008D associated with the luminous X-ray transient 080109: An energetic explosion of a massive helium star. Astrophysical Journal, 692(2), 1131-1142. https://doi.org/10.1088/0004-637X/692/2/1131