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Optical Spectra of Type Ia Supernovae at z=0.46 and z=1.2
Alison L. Coil, Thomas Matheson, Alexei V. Filippenko +19
We present optical spectra, obtained with the Keck 10-m telescope, of two high-redshift type Ia supernovae (SNe Ia) discovered by the High-z Supernova Search Team: SN 1999ff at z=0…
The Subluminous Type Ia Supernova 1998de in NGC 252
Maryam Modjaz, Weidong Li, Alexei V. Filippenko +5
We present spectroscopic and extensive photometric observations of supernova (SN) 1998de in the S0 galaxy NGC 252, discovered during the course of the Lick Observatory Supernova Se…
Detailed Analysis of Early to Late-Time Spectra of Supernova 1993J
Thomas Matheson, Alexei V. Filippenko, Luis C. Ho +2
We present a detailed study of line structure in early to late-time spectra of Supernova (SN) 1993J. Spectra during the nebular phase, but within the first two years after explosio…
Optical Spectroscopy of Supernova 1993J During Its First 2500 Days
T. Matheson, A. V. Filippenko, A. J. Barth +15
We present 42 low-resolution spectra of Supernova (SN) 1993J, our complete collection from the Lick and Keck Observatories, from day 3 after explosion to day 2454, as well as one K…
Helium Emission in the Type Ic SN 1999cq
Thomas Matheson, Alexei V. Filippenko, Ryan Chornock +2
We present the first unambiguous detection of helium emission lines in spectra of Type Ic supernovae (SNe Ic). The presence of He I lines, with full width at half maximum ~ 2000 km…