Optical photometry and spectroscopy of the Type Ibn supernova SN 2006jc until the onset of dust formation

Anupama, GC and Sahu, DK and Gurugubelli, UK and Prabhu, TP and Tominaga, N and Tanaka, M and Nomoto, K (2009) Optical photometry and spectroscopy of the Type Ibn supernova SN 2006jc until the onset of dust formation. In: Monthly Notices of the Royal Astronomical Society, 392 (2). pp. 894-903.

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Abstract

We present optical UBVRI photometric and spectroscopic data of the Type Ibn supernova SN 2006jc, until the onset of the dust-forming phase. The optical spectrum shows a blue continuum and is dominated by the presence of moderately narrow $(velocity \sim 2500 km s^{-1})$ He I emission lines superimposed over a relatively weak supernova spectrum. The helium lines are produced in a pre-existing He-rich circumstellar shell. The observed helium line fluxes indicate the circumstellar shell is dense, with a density of $ \sim 10^9 –10^{10} cm^{-3) $. The helium mass in this shell is estimated to be \preceq 0.07M. The optical light curves show a clear signature of dust formation, indicated by a sharp decrease in the magnitudes around day 50, accompanied by a reddening of the colours. The evolution of the optical light curves during the early phase and that of the uvoir bolometric light curve at all phases is reasonably similar to normal Ib/c supernovae.

Item Type:	Journal Article
Publication:	Monthly Notices of the Royal Astronomical Society
Publisher:	Blackwell Publishing
Additional Information:	Copyright of this article belongs to Blackwell Publishing.
Keywords:	circumstellar matter;supernovae:general;supernovae: individual:SN 2006jc.
Department/Centre:	Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited:	06 Nov 2009 04:41
Last Modified:	19 Sep 2010 05:24
URI:	http://eprints.iisc.ac.in/id/eprint/18629

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