Supernova 2002bo: inadequacy of the single parameter description

By S. Benetti, P. Meikle, M. Stehle, G. Altavilla, S. Desidera, G. Folatelli, A. Goobar, Seppo Mattila, J. Méndez, H. Navasardyan and 8 more. 2003

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We present optical photometry and optical/near-infrared spectra of the type Ia SN 2002bo spanning epochs from -13 days before maximum B-band light to +102 days after. The pre-maximum optical coverage is particularly complete. The extinction de- duced from the observed colour evolution and from interstellar NaID absorption is quite high viz. E(B V ) = 0.43 ± 0.10. On the other hand, model matches to the observed spectra point to a lower reddening (E(B V ) � 0.30). In some respects, SN 2002bo behaves as a typical "Branch normal" type Ia supernova (SN Ia) at opti- cal and IR wavelengths. We find a B-band risetime of 17.9±0.5 days, am15(B) of 1.13±0.05, and a de-reddened MB = 19.41±0.42. However, comparison with other type Ia supernovae having similarm15(B) values indicates that in other respects SN 2002bo is unusual. While the optical spectra of SN 2002bo are very similar to those of SN 1984A (�m15(B) = 1.19), lower velocities and a generally more structured ap- pearance are found in SNe 1990N, 1994D and 1998bu. For supernovae havingm15(B) > 1.2, we confirm the variation of R(SiII) (Nugent et al. 1995) withm15(B). How- ever, for supernovae such as SN 2002bo, with lower values ofm15(B) the relation breaks down. Moreover, the evolution of R(SiII) for SN 2002bo is strikingly differ- ent from that shown by other type Ia supernovae. The velocities of SN 2002bo and 1984A derived from SII 5640u SiII 6355u and CaII H&K lines are either much higher and/or evolve differently from those seen in other normal SNe Ia events. Thus, while SN 2002bo and SN 1984A appear to be highly similar, they exhibit behaviour which is distinctly different from other SNe Ia having similarm15(B) values. We suggest that the unusually low temperature, the presence of high-velocity intermediate-mass elements and the low abundance of carbon at early times indicates that burning to Si penetrated to much higher layers than in more normal type Ia supernovae. This may be indicative of a delayed-detonation explosion.

Subfields: Astronomy and Astrophysics, Electrical and Electronic Engineering, Nuclear and High Energy Physics

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Citations in the corpus

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• Type Ia Supernovae Are Good Standard Candles in the Near Infrared: Evidence from PAIRITEL (2007, unknown): “…Hernandez et al. (2000), Valentini et al. (2003), Candia et al. (2003), Krisciunas et al. (2000, 2001, 2003, 2004b, 2004c, 2005, 2006, 2007), Benetti et al. (2004), Elias-Rosa et al. (2006, 2008), Phillips et al. (2006), Pastorello et al. (2007b, 2007a), Prieto et al. (2007), Stritzinger &…”
• Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples (2014, methodology): “It has been trained on photometric and spectroscopic data from the literature (e.g., Schmidt et al. 1994; Patat et al. 1996; Hamuy et al. 2002; Benetti et al. 2004; Matheson et al. 2008) and high-z supernovae data from the SNLS (Ellis et al. 2008; Balland et al. 2009).”
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• THE SPECTROSCOPIC DIVERSITY OF TYPE Ia SUPERNOVAE (2000, unknown): “…et al. 2002a 2000E Valentini et al. 2003a 2000cx Li et al. 2001a 2001ay Krisciunas et al. 2011b 2001el Wang et al. 2003a, Mattila et al. 2005 2002bo Benetti et al. 2004a 2002dj Pignata et al. 2008a 2002er Kotak et al. 2005 2003cg Elias-Rosa et al. 2006a 2003du Anupama et al. 2005a, Stanishev…”
• Abundance stratification in Type Ia supernovae - I. The case of SN 2002bo (2004, methodology): “From the present analysis, and from that of the IR spectra (Benetti et al. 2004), we can set an upper limit for the C abundance of 3% restricted to velocities > 25, 000 kms−1.”
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• Spectropolarimetry of Supernovae (2008, background): “Ap., 27, 629 Benetti et al. (2004)Benetti, S. et al. 2004, MNRAS, 348, 261 Benetti et al.(2005)Benetti, S., et al. 2005, Ap.”