Nebular phase observations of the type-Ib supernova iPTF13bvn favour a binary progenitorReport as inadecuate

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Aims. We present and analyse late-time observations of the Type-Ib supernova with possible pre-supernova progenitor detection, iPTF13bvn, which were done similar to 300 days after the explosion. We discuss them in the context of constraints on the supernova-s progenitor. Previous studies have proposed two possible natures for the progenitor of the supernova, i.e. a massive Wolf-Rayet star or a lower-mass star in a close binary system. Methods. Our observations show that the supernova has entered the nebular phase, with the spectrum dominated by Mg Ilambda lambda 4571, O Ilambda lambda 6300, 6364, and Ca IIlambda lambda 7291, 7324 emission lines. We measured the emission line fluxes to estimate the core oxygen mass and compared the O I-Ca II line ratio with other supernovae. Results. The core oxygen mass of the supernova progenitor was estimated to be less than or similar to 0.7 M-circle dot, which implies initial progenitor mass that does not exceed similar to 15-17 M-circle dot. Since the derived mass is too low for a single star to become a Wolf-Rayet star, this result lends more support to the binary nature of the progenitor star of iPTF13bvn. The comparison of O I-Ca II line ratio with other supernovae also shows that iPTF13bvn appears to be in close association with the lower mass progenitors of stripped-envelope and Type-II supernovae.Nota general

Artículo de publicación ISI

Author: Kuncarayakti, Hanindyo; - Maeda, Keiichi; - Bersten, Melina Cecilia; - Folatelli, Gastón; - Morrell, Nidia; - Hsiao, E. Y.; - Go



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