We present an algorithm to identify the type of an SN spectrum and to determine its redshift
and age. This algorithm, based on the correlation techniques of Tonry & Davis, is …

We describe the implementation and optimization of the ESSENCE supernova survey, which
we have undertaken to measure the dark energy equation-of-state parameter, w= P/(ρc 2) …

We present new techniques for improving the efficiency of supernova (SN) classification at
high redshift using 64 candidates observed at Gemini North and South during the first year …

Over the last 20 years, supernovae have become a key tool to constrain the expansion
history of the Universe through the construction of Hubble diagrams, using luminosity …

Using archival data of low-redshift (z< 0.01; Center for Astrophysics and SUSPECT
databases) Type Ia supernovae (SNe Ia) and recent observations of high-redshift (0.16< z< …

Aims. We present 139 spectra of 124 Type Ia supernovae (SNe Ia) that were observed at the
ESO/VLT during the first three years of the Canada-France-Hawaï Telescope (CFHT) …

This paper presents spectroscopy of supernovae (SNe) discovered in the first season of the
Sloan Digital Sky Survey-II SN Survey. This program searches for and measures multi-band …

We present a large-scale effort of creating composite spectra of high-redshift SNe Ia and
comparing them to low-redshift counterparts in an attempt to understand possible cosmic …

The ESSENCE survey discovered 213 Type Ia supernovae at redshifts $0.1\lt z\lt 0.81$
between 2002 and 2008. We present their R-and I-band photometry, measured from images …

We present the results of spectroscopic observations of targets discovered during the first 2
years of the ESSENCE project. The goal of ESSENCE is to use a sample of∼ 200 Type Ia …