The type IIn supernova 1995G: interaction with the circumstellar medium
Date Issued
2002
Author(s)
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Danziger, I. J.
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Mazzali, P. A.
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Patat, F.
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Filippenko, A. V.
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Schlegel, D. J.
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Matheson, T.
Abstract
We present the photometric and spectroscopic evolution of the type IIn SN 1995G in NGC 1643, on the basis of 4 years of optical and infrared observations. This supernova shows very flat optical light curves similar to SN 1988Z, with a slow decline rate at all times. The spectra are characterized by strong Balmer lines with multiple components in emission and with a P Cygni absorption component blueshifted by only 700kms-1. This feature indicates the presence of a slowly expanding shell above the SN ejecta as in the case of SNe 1994aj and 1996L. As in other SNe IIn, the slow luminosity decline cannot be explained only with a radioactive energy input, and an additional source of energy is required, most likely that produced by the interaction between supernova ejecta and a pre-existent circumstellar medium (CSM). It was estimated that the shell material has a density nH>>108cm-3, consistent with the absence of forbidden lines in the spectra. About 2 years after the burst the low-velocity shell is largely overtaken by the SN ejecta and the luminosity drops at a faster rate.
Volume
333
Issue
1
Start page
27
Issn Identifier
0035-8711
Ads BibCode
2002MNRAS.333...27P
Rights
open.access
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