Optical observations of type-IIP supernova 2004dj: Evidence for asymmetry of the Ni ejecta

Photometric and spectroscopic observations of the nearby type-IIP supernova 2004dj are presented. The Ni mass in the envelope of SN 2004dj was estimated from the light curve to be -0.02M {circled dot}. This estimate is confirmed by modeling the Ha luminosity. The Ha emission line exhibits a strong a...

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Bibliographic Details
Published in:Astronomy letters 2005-12, Vol.31 (12), p.792-805
Main Authors: Chugai, N N, Fabrika, S N, Sholukhova, O N, Goranskij, V P, Abolmasov, P K, Vlasyuk, V V
Format: Article
Language:English
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Summary:Photometric and spectroscopic observations of the nearby type-IIP supernova 2004dj are presented. The Ni mass in the envelope of SN 2004dj was estimated from the light curve to be -0.02M {circled dot}. This estimate is confirmed by modeling the Ha luminosity. The Ha emission line exhibits a strong asymmetry characterized by the presence of a blue component in the line with a shift of -1600 km s at the early nebular phase. A similar asymmetry was found in the Hb, [O I], and [Ca II] lines. The line asymmetry is interpreted as being the result of asymmetric Ni ejecta. The Ha profile and its evolution are reproduced in the model of an asymmetric bipolar Ni structure for a spherical hydrogen distribution. The mass of the front Ni jet is comparable to that of the central component and twice that of the rear Ni jet. We point out that the asymmetric bipolar structure of Ni ejecta is also present in SN 1999em, a normal type-IIP supernova.
ISSN:1063-7737
DOI:10.1134/1.2138766