Astrophys. J., 703, 1624-1634 (2009/October-1)
SN 2003bg: a broad-lined type IIb supernova with hydrogen.
MAZZALI P.A., DENG J., HAMUY M. and NOMOTO K.
Abstract (from CDS):
Models for the spectra and the light curve (LC), in the photospheric as well as in the late nebular phase, are used to infer the properties of the very radio-bright, broad-lined type IIb supernova (SN) 2003bg. Consistent fits to the LC and the spectral evolution are obtained with an explosion that ejected ~4 M☉ of material with a kinetic energy of ~5 x1051 erg. A thin layer of hydrogen, comprising ∼0.05 M☉, is inferred to be present in the ejecta at the highest velocities (v ≳ 9000 km/s), while a thicker helium layer, comprising ~1.25 M☉, was ejected at velocities between 6500 and 9000 km/s. At lower velocities, heavier elements are present, including ∼0.2 M☉ of 56Ni that shape the LC and the late-time nebular spectra. These values suggest that the progenitor star had a mass of ~20-25 M☉, (comparable to, but maybe somewhat smaller than that of the progenitor of the X-ray flashes/SN 2008D). The rather broad-lined early spectra are the result of the presence of a small amount of material (~0.03 M☉) at velocities >0.1c, which carries ~10% of the explosion kinetic energy. No clear signatures of a highly aspherical explosion are detected.
nuclear reactions, nucleosynthesis, abundances - stars: evolution - supernovae: general - supernovae: individual: SN 2003bg
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