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Type Ib SN 1999dn as an example of the thoroughly mixed ejecta of Ib supernovae
Cano, Zach; Maeda, Keiichi; Schulze, Steve
AA(Centre for Astrophysics and Cosmology, Science Institute, University of Iceland, Reykjavik 107, Iceland; ), AB(Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto 606-8502, Japan; Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan), AC(Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile; Millennium Center for Supernova Science, Camino del Observatorio 1515, Las Condes, Chile)
Monthly Notices of the Royal Astronomical Society, Volume 438, Issue 4, p.2924-2937 (MNRAS Homepage)
Publication Date:
Astronomy Keywords:
methods: analytical, methods: data analysis, methods: observational, supernovae: general, supernovae: individual: 1999dn
Abstract Copyright:
2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
Bibliographic Code:


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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