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The type Ib SN 1999dn: one year of photometric and spectroscopic monitoring

Benetti, S., Turatto, M., Valenti, S., Pastorello, A., Cappellaro, E., Botticella, M. T., Bufano, F., Ghinassi, F., Harutyunyan, A., Inserra, C., Magazzù, A., Patat, F., Pumo, M. L. and Taubenberger, S. 2011. The type Ib SN 1999dn: one year of photometric and spectroscopic monitoring. Monthly Notices of the Royal Astronomical Society 411 (4) , pp. 2726-2738. 10.1111/j.1365-2966.2010.17873.x

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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.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 2 July 2019
Date of Acceptance: 15 October 2010
Last Modified: 23 Aug 2019 11:15

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