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

Tanaka, Masaomi ; Tominaga, Nozomu ; Nomoto, Ken'ichi ; Valenti, S. ; Sahu, D. K. ; Minezaki, T. ; Yoshii, Y. ; Yoshida, M. ; Anupama, G. C. ; Benetti, S. ; Chincarini, G. ; Valle, M. Della ; 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). pp. 1131-1142. ISSN 0004-637X

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Official URL: http://iopscience.iop.org/article/10.1088/0004-637...

Related URL: http://dx.doi.org/10.1088/0004-637X/692/2/1131

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 ± 1.0 M☉ and a kinetic energy of EK = 6.0 ± 2.5 × 1051erg. 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 = 20-25 M☉, 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.

Item Type:Article
Source:Copyright of this article belongs to American Astronomical Society.
Keywords:Nuclear Reactions; Nucleosynthesis; Abundances; Radiative Transfer; Supernovae: General; Supernovae: Individual (SN 2008D)
ID Code:100702
Deposited On:10 Dec 2016 12:50
Last Modified:10 Dec 2016 12:50

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