ESC observations of SN 2005cf: II. Optical Spectroscopy and the high velocity features

Details ESC observations of SN 2005cf: II. Optical Spectroscopy and the high velocity features ESC observations of SN 2005cf: II. Optical Spectroscopy and the high velocity features

2007-02-21

arxiv.org/abs/astro-ph/0702569v1

Astronomy and Astrophysics

Astrophysics

A&A accepted for publication

Scientific paper

10.1051/0004-6361:20066971

The ESC-RTN optical spectroscopy data-set for SN 2005cf is presented and analyzed. The observations range from -11.6 and +77.3 days with respect to B-band maximum light. The evolution of the spectral energy distribution of SN 2005cf is characterized by the presence of high velocity SiII and CaII features. SYNOW synthetic spectra are used to investigate the ejecta geometry of silicon. Based on the synthetic spectra the SiII high velocity feature appears detached at 19500 km/s. We also securely establish the presence of such feature in SN 1990N, SN 1994D, SN 2002er and SN 2003du. On a morphological study both the CaII IR Triplet and H&K absorption lines of SN 2005cf show high velocity features centered around 24000 km/s. When compared with other Type Ia SNe based on the scheme presented in Benetti et al. 2005 SN 2005cf definitely belongs to the LVG group.

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