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http://hdl.handle.net/20.500.12386/32861
Titolo: | The type IIn supernova 1995G: interaction with the circumstellar medium | Autori: | PASTORELLO, Andrea TURATTO, Massimo BENETTI, Stefano CAPPELLARO, Enrico Danziger, I. J. Mazzali, P. A. Patat, F. Filippenko, A. V. Schlegel, D. J. Matheson, T. |
Data pubblicazione: | 2002 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 333 | Fascicolo: | 1 | Da pagina:: | 27 | 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<SUP>-1</SUP>. 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 n<SUB>H</SUB>>>10<SUP>8</SUP>cm<SUP>-3</SUP>, 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. | URI: | http://hdl.handle.net/20.500.12386/32861 | URL: | https://academic.oup.com/mnras/article/333/1/27/1187467 https://api.elsevier.com/content/abstract/scopus_id/19044372575 https://ui.adsabs.harvard.edu/abs/2002MNRAS.333...27P/abstract |
ISSN: | 0035-8711 | DOI: | 10.1046/j.1365-8711.2002.05366.x | Bibcode ADS: | 2002MNRAS.333...27P | Fulltext: | open |
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