We present results from the first high-resolution, high signal-to-noise ratio spectrum of SN 2002ic. The resolved Ha line has a P Cygni-type profile, clearly demonstrating the presence of a dense, slow-moving (~100 km s-1) outflow. We have additionally found a huge near-infrared excess, hitherto unseen in Type Ia supernovae. We argue that this is due to an infrared light-echo arising from the pre-existing dusty circumstellar medium. We deduce a circumstellar medium mass probably exceeding 0.3 Msolar produced by a mass-loss rate greater than several times 10-4 Msolar yr-1. For the progenitor, we favour a single-degenerate system where the companion is a post-asymptotic giant branch star. As a by-product of our optical data, we are able to provide a firm identification of the host galaxy of SN 2002ic.
ASJC Scopus subject areas
- Space and Planetary Science
Kotak, R., Meikle, W. P. S., Adamson, A., & Leggett, S. K. (2004). On the nature of the circumstellar medium of the remarkable Type Ia/IIn supernova SN 2002ic. Monthly Notices of the Royal Astronomical Society, 354(2)(2), L13-L17. https://doi.org/10.1111/j.1365-2966.2004.08306.x