2007/02/21 by A. Pastorello, P. A. Mazzali, G. Pignata +36 · 2 citations
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Gamma-ray bursts and supernovae #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2007.11700.x
published as Mon.Not.Roy.Astron.Soc.377:1531-1552,2007 · 28 pages, 17 figures, accepted for publication in MNRAS
arxiv created 2007/02/21 · openalex publication_date 2007/05/06 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/01
We present optical and infrared observations of the unusual Type Ia supernova (SN) 2004eo. The light curves and spectra closely resemble those of the prototypical SN 1992A, and the luminosity at maximum (M B = -19.08) is close to the average for a Type Ia supernova (SN Ia). However, the ejected 56 Ni mass derived by modelling the bolometric light curve (about 0.45 M ) lies near the lower limit of the 56 Ni mass distribution observed in normal SNe Ia. Accordingly, SN 2004eo shows a relatively rapid post-maximum decline in the light curve [ m 15 (B) true = 1.46], small expansion velocities in the ejecta and a depth ratio Si II 5972/Si II 6355 similar to that of SN 1992A. The physical properties of SN 2004eo cause it to fall very close to the boundary between the faint, low-velocity gradient and high-velocity gradient subgroups proposed by Benetti et al.