The Type IIn SN 1995G: Interaction with the CSM

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 700 km/s. 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. It was estimated that the shell material has a density n(H) >> 10^8 cm^-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.

14 pages, including 11 figures. Accepted by MNRAS

References in corpus (16)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Northern JHK Standard Stars for Array Detectors
• Optical and Infrared Spectroscopy of the type IIn SN 1998S : Days 3-127
• The Peculiar Type II Supernova 1997 D: A Case for a Very Low 56Ni Mass
• Optical and Infrared photometry of the type IIn SN 1998S:Days 11-146
• A very low mass of Ni-56 in the ejecta of SN 1994W
• SN1997cy/GRB970514 - A New Piece in the GRB Puzzle?
• The properties of Supernova 1997cy associated to GRB970514
• SN 1988Z: Spectro-photometric catalogue and energy estimates
• A Black Hole in the X-Ray Nova Velorum 1993
• The fading of SN 1997D
• The b Distribution of the Lya Forest: Probing Cosmology and the Intergalactic Medium
• The circumstellar medium of the peculiar supernova SN1997ab
• Supernova 1996L: evidence of a strong wind episode before the explosion
• The X-ray Spectrum and Light Curve of Supernova 1995N
• Supernova 1994aj: a probe for pre-supernova evolution and mass loss from the progenitor

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