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Monthly Notices of the Royal Astronomical Society 377 (2007) 1531-1552
ESC and KAIT Observations of the Transitional Type Ia SN 2004eo
A. Pastorello, P.A. Mazzali, G. Pignata, S. Benetti, E. Cappellaro, A.V. Filippenko, W. Li, W.P.S. Meikle, A.A. Arkharov, G. Blanc1, F. Bufano, A. Derekas, M. Dolci, N. Elias-Rosa, R.J. Foley, M. Ganeshalingam, A. Harutyunyan, L.L. Kiss, R. Kotak, V.M. Larionov, J.R. Lucey, N. Napoleone, H. Navasardyan, F. Patat, J. Rich, S.D. Ryder, M. Salvo, B.P. Schmidt, V. Stanishev, P. Szekely, S. Taubenberger, S. Temporin2, M. Turatto, W. Hillebrandt

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 SN Ia. However, the ejected 56Ni mass derived by modelling the bolometric light curve (about 0.45 solar masses) lies near the lower limit of the 56Ni mass distribution observed in normal SNe Ia. Accordingly, SN 2004eo shows a relatively rapid post-maximum decline in the light curve (Delta m_(B) = 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. (2005). Similar behaviour is seen in a few other SNe Ia. Thus, there may in fact exist a few SNe Ia with intermediate physical properties.
1 :  APC - UMR 7164 - AstroParticule et Cosmologie
2 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
APC - Cosmologie et Gravitation
Planète et Univers/Astrophysique

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
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