Journal Article

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. Magazzù, F. Patat, M. L. Pumo and S. Taubenberger

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 4, pages 2726-2738
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17873.x
The Type Ib SN 1999dn: one year of photometric and spectroscopic monitoring*

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Extensive optical and near-infrared observations of the Type Ib supernova (SNIb) 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 (MV=−17.2 mag). From the bolometric light curve and ejecta expansion velocities, we estimate that about 0.11 M of 56Ni were produced during the explosion and that the total ejecta mass was 4–6 M with a kinetic energy of at least 5 × 1051 erg. The spectra of SN 1999dn at various epochs are similar to those of other stripped envelope SNe showing clear presence of H at early epochs. The high explosion energy and ejected mass, along with the small flux ratio [Ca ii]/[O i] measured in the nebular spectrum, together with the lack of signatures of dust formation and the moderate metallicity environment is not inconsistent with a single massive progenitor (MZAMS≥ 23–25 M) for SN 1999dn.

Keywords: supernovae: general; supernovae: individual: 1999dn

Journal Article.  10655 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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