Type Ibn supernova SN~2010al: Powerful mass loss half year prior to the explosion
Abstract
Type Ibn supernova SN~2010al is explored to infer parameters of supernova and a circumstellar (CS) shell. The CS interaction model combined with the spectral model of 4600\ blend suggests the explosion of a WR star with the energy of (1-1.5)×1051 erg inside a dense confined CS shell with the mass of 0.1\ and kinetic energy of 1048 erg. The confined CS shell has been formed during the last 0.4 yr prior to the core collapse.
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