TYPE Ib SUPERNOVA 2008D ASSOCIATED WITH THE LUMINOUS X-RAY TRANSIENT 080109: AN ENERGETIC EXPLOSION OF A MASSIVE HELIUM STAR

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 M ej = 5.3 ± 1.0 M ☉ and a kinetic energy of E K = 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 × 10–4 M ☉) prior to the explosion. The main-sequence mass of the progenitor is estimated to be M MS = 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.

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