Subaru Spectroscopy of the Peculiar Type Ia Supernova 2002ic: Interaction with a Hydrogen-rich Progenitor Wind

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  • 1 December 2003
Abstract
Optical spectroscopy of the peculiar Type Ia supernova (SN Ia) 2002ic obtained on 2003 June 27.6 UT, i.e. about 222 rest-frame days after explosion, is presented. Strong H emission indicates an interaction between the expanding SN ejecta and a H-rich circumstellar medium (CSM). The spectrum of SN 2002ic resembles those of the Type IIn supernovae (SNe IIn) 1997cy and 1999E. The three supernovae (SNe) also have similar luminosities, suggesting that they are the same phenomenon and that the CSM is also similar. The observed line profiles and line ratios are measured, and discussed within the ejecta-CSM interaction scenario. A high-density, probably clumpy CSM is inferred. Besides the SN IIn-like H-Balmer, [O III], and He lines, broad [Fe II] blends are also identified, reminiscent of the late-time spectra of normal SNe Ia. Strong, very broad [Ca II]/Ca II and [O I]/O I emissions imply that not all the outer SN ejecta were decelerated in the interaction, suggesting that the CSM is aspherical.

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