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arXiv · 1010.3199

The Type Ib SN 1999dn: One Year of Photometric and Spectroscopic Monitoring

S. Benetti·M. Turatto·S. Valenti·A. Pastorello·E. Cappellaro·M. T. Botticella·F. Bufano·F. Ghinassi·A. Harutyunyan·C. Inserra·A. Magazzu'·F. Patat·M. L. Pumo·S. Taubenberger
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Abstract

Extensive optical and near-infrared (NIR) observations of the type Ib supernova 1999dn are presented, covering the first year after explosion. These new data turn this object, already considered a prototypical SNIb, into one of the best observed objects of its class. The light curve of SN 1999dn is mostly similar in shape to that of other SNeIb but with a moderately faint peak M_V=-17.2 mag). From the bolometric light curve and ejecta expansion velocities, we estimate that about 0.11 Msun of 56Ni were produced during the explosion and that the total ejecta mass was 4-6 Msun with a kinetic energy of at least 5x10^{51} erg. The spectra of SN 1999dn at various epochs are similar to those of other Stripped Envelope (SE) SNe showing clear presence of H at early epochs. The high explosion energy and ejected mass, along with the small flux ratio [CaII]/[OI] measured in the nebular spectrum, together with the lack of signatures of dust formation and the relatively high-metallicity environment point toward a single massive progenitor (M_ZAMS>=23-25 Msun) for SN 1999dn.

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S. Benetti, M. Turatto, S. Valenti, A. Pastorello, E. Cappellaro, M. T. Botticella, F. Bufano, F. Ghinassi, A. Harutyunyan, C. Inserra, A. Magazzu', F. Patat, M. L. Pumo, S. Taubenberger. 2010-10-15. The Type Ib SN 1999dn: One Year of Photometric and Spectroscopic Monitoring. https://doi.org/10.1111/j.1365-2966.2010.17873.x

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