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2014MNRAS.438.2924C - Mon. Not. R. Astron. Soc., 438, 2924-2937 (2014/March-2)

Type Ib SN 1999dn as an example of the thoroughly mixed ejecta of Ib supernovae.


Abstract (from CDS):

We present the results of modelling archival observations of Type Ib SN 1999dn. In the spectra, two Hei absorption features are seen: a slower component with larger opacity, and a more rapid Hei 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.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): methods: analytical - methods: data analysis - methods: observational - supernovae: general - supernovae: individual: 1999dn

CDS comments: In Chap. 1 : SN 2000we is a misprint for SN 2000ew.

Simbad objects: 16

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