2009ApJ...692.1131T

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±2.5x10⁵¹ erg. The progenitor star of the SN has a 6-8 M_☉ He core with essentially no H envelope (<5x10^–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.