Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 438, Issue 4, Pages 2924-2937Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt2400
Keywords
methods: analytical; methods: data analysis; methods: observational; supernovae: general; supernovae: individual: 1999dn
Categories
Funding
- Icelandic Research Fund
- Iniciativa Cientifica Milenio grant (Millennium Center for Supernova Science) [P10-064-F]
- Basal-CATA [PFB-06/2007]
- JSPS [23740141]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
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We present the results of modelling archival observations of Type Ib SN 1999dn. In the spectra, two He i absorption features are seen: a slower component with larger opacity, and a more rapid He i component with smaller opacity. Complementary results are obtained from modelling the bolometric light curve of SN 1999dn, where a two-zone model (dense inner region, and less dense outer region) provides a much better fit than a one-zone model. A key result we find is that roughly equal amounts of radioactive material are found in both regions. The two-zone analytical model provides a more realistic representation of the structure of the ejecta, including mixing and asymmetries, which offers a physical explanation for how the radioactive material is propelled to, and mixed within, the outer regions. Our result supports the theoretical expectation that the radioactive content in the outflow of a Type Ib supernova (SN) is thoroughly mixed. We fit our model to six additional SNe Ibc, of which the majority of the SNe Ib are best described by the two-zone model, and the majority of the SNe Ic by the one-zone model. Of the SNe Ic, only SN 2007gr was best fitted by the two-zone model, indicating that the lack of helium spectral features for this event cannot be attributed to poor mixing.
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