Optical spectroscopy of the Type Ia supernova SN 2002ic obtained on 2003 June 27.6 UT,
ie,∼ 222 rest-frame days after explosion, is presented. Strong H emission indicates an …

The discovery of SN 2002ic and subsequent spectroscopic studies have led to the surprising
finding that SN 2002ic is a Type Ia supernova with strong ejecta-circumstellar interaction …

Here we present previously unpublished optical spectra of supernova (SN) 2001ig, a Type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 …

SN 2017dio shows both spectral characteristics of a type-Ic supernova (SN) and signs of a
hydrogen-rich circumstellar medium (CSM). Prominent, narrow emission lines of H and He …

An optical photometric and spectroscopic analysis of the slowly-evolving type IIn SN 2007rt
is presented, covering a duration of 481 days after discovery. Its earliest spectrum, taken …

We report optical and infrared spectroscopic observations of the Type Ia SN 1999ee and the
Type Ib/c SN 1999ex, both of which were hosted by the galaxy IC 5179. For SN 1999ee we …

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 …

We present nebular phase optical imaging and spectroscopy and near/mid-IR imaging of the
Type II SN 2006bc. Observations reveal the central wavelength of the symmetric Hα line …

We present optical and near-IR photometry and spectroscopy of SN 2013L for the first 4 yr
post-explosion. SN 2013L was a moderately luminous (M r=− 19.0) Type IIn supernova (SN) …

We present observations of the Type Ia supernova 2003du obtained with the Hobby-Eberly
Telescope and report the detection of a high-velocity component in the Ca II infrared triplet …