Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-09-24
Mon.Not.Roy.Astron.Soc.348:261,2004
Astronomy and Astrophysics
Astrophysics
Accepted to MNRAS. Some near-IR photometry has been added. The paper can be retrieved also at http://web.pd.astro.it/supern/
Scientific paper
10.1111/j.1365-2966.2004.07357.x
We present optical/near-infrared photometry and 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. In some respects, SN 2002bo behaves as a typical "Branch normal" type Ia supernova (SN Ia) at optical and IR wavelengths. We find a B-band risetime of 17.9+-0.5 days, a Dm_{15}(B) of 1.13+-0.05, and a M_B=-19.41+-0.42. However, comparison with other type Ia supernovae having similar Delta m_{15}(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, lower velocities and a generally more structured appearance are found in SNe 1990N, 1994D and 1998bu. For supernovae having Dm_(15)(B) > 1.2, we confirm the variation of R(SiII) (Nugent et al. 1995) with Dm_(15)(B). However, for supernovae such as SN2002bo, with lower values of Dm_(15)(B) the relation breaks down. Moreover, the evolution of R(SiII) for SN 2002bo is strikingly different from that shown by other type Ia supernovae. The velocities of SN 2002bo and 1984A derived from SII 5640A, SiII 6355A and CaII H&K lines are either much higher and/or evolve differently from those seen in other normal SNe Ia events. 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.
Altavilla Giuseppe
Benetti Stefano
Desidera Silvano
Folatelli Gaston
Goobar Ariel
No associations
LandOfFree
Supernova 2002bo: inadequacy of the single parameter description does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Supernova 2002bo: inadequacy of the single parameter description, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supernova 2002bo: inadequacy of the single parameter description will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-509572