SN 2009kn - the twin of the Type IIn supernova 1994W
SN 2009kn - the twin of the Type IIn supernova 1994W
We present an optical and near-infrared photometric and spectroscopic study of supernova (SN) 2009kn spanning ∼1.5 yr from the discovery. The optical spectra are dominated by the narrow (full width at half-maximum ∼1000 km s−1) Balmer lines distinctive of a Type IIn SN with P Cygni profiles. Contrarily, the photometric …