Here we present previously unpublished optical spectra of supernova (SN) 2001ig, a Type
IIb SN, from about a week after explosion until nearly one year later. The earliest spectrum …

We present optical and near-infrared observations of the type IIb supernova (SN) 2011fu
from a few days to∼ 300 d after explosion. The SN presents a double-peaked light curve …

I present an overview of optical observations (mostly spectra) of Type II supernovae. SNe II
are defined by the presence of hydrogen, and exhibit a very wide variety of properties. SNe II …

Synthetic spectra generated with the parameterized supernova synthetic spectrum code
SYNOW are compared to spectra of the unusual Type Ib supernova 2005bf. We confirm the …

We report spectroscopic and photometric observations of the Type IIb SN 2011dh obtained
between 4 and 34 days after the estimated date of explosion (May 31.5 UT). The data cover …

Optical UBVRI photometry and low-resolution spectroscopy of the Type IIb supernova SN
2011dh in M51 are presented, covering the first year after the explosion. The light curve and …

We present 84 spectra of Type Ib/c and Type IIb supernovae (SNe), describing the individual
SNe in detail. The relative depths of the helium absorption lines in the spectra of the SNe Ib …

Photometric and spectroscopic observations of the peculiar Type Ib supernova 1991D are
presented. SN 1991D was exceptionally bright for a Type Ib supernova. The He i lines were …

We present the low-resolution spectroscopic and UBVRI broad-band photometric
investigations of the Type IIb supernova (SN) 2011fu, discovered in UGC 01626. The …

We present nebular spectra of the nearby Type IIb supernova (SN) 2011dh taken between
201 and 678 d after core collapse. At these late times, SN 2011dh exhibits strong emission …