The Type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope

We present and analyse spectra of the Type IIn supernova (SN) 1994W obtained between 18 and 203 d after explosion. During the luminous phase (first 100 d) the line profiles are composed of three major components: (i) narrow P-Cygni lines with the absorption minima at -700 km s(-1); (ii) broad emission lines with blue velocity at zero intensity similar to4000 km s(-1); and (iii) broad, smooth wings extending out to at least similar to5000 km s(-1), most apparent in Halpha. These components are identified with an expanding circumstellar (CS) envelope, shocked cool gas in the forward post-shock region, and multiple Thomson scattering in the CS envelope, respectively. The absence of broad P-Cygni lines from the SN is the result of the formation of an optically thick, cool, dense shell at the interface of the ejecta and the CS envelope. Models of the SN deceleration and Thomson scattering wings are used to recover the density (n approximate to 10(9) cm(-3)), radial extent [similar to(4-5) x 10(15) cm] and Thomson optical depth (tau(T) greater than or similar to 2.5) of the CS envelope during the first month. The plateau-like SN light curve is reproduced by a hydrodynamical model and is found to be powered by a combination of internal energy leakage after the explosion of an extended pre-SN (similar to10(15) cm) and subsequent luminosity from CS interaction. The pre-explosion kinematics of the CS envelope is recovered, and is close to homologous expansion with outer velocity similar to1100 km s(-1) and a kinematic age of similar to1.5 yr. The high mass (similar to0.4 M-circle dot) and kinetic energy (similar to2 x 10(48) erg) of the CS envelope, combined with low age, strongly suggest that the CS envelope was explosively ejected similar to1.5 yr prior to the SN explosion.