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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. ORCID:, 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: 05 May 2023 13:18

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