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Nonlinear Decline-Rate Dependence and Intrinsic Variation of Type Ia Supernova Luminosities
Lifan Wang, Mark Strovink, Alexander Conley +4
Published B and V fluxes from nearby Type Ia supernovae are fitted to light-curve templates with 4-6 adjustable parameters. Separately, B magnitudes from the same sample are fitted…
GRB 050408: An Atypical Gamma-Ray Burst as a Probe of an Atypical Galactic Environment
R. J. Foley, D. A. Perley, D. Pooley +14
The bright GRB 050408 was localized by HETE-II near local midnight, enabling an impressive ground-based followup effort as well as space-based followup from Swift. The Swift data f…
Photometric selection of high-redshift type Ia supernovae
M. Sullivan, D. A. Howell, K. Perrett +26
We present a method for selecting high-redshift type Ia supernovae (SNe Ia) located via rolling SN searches. The technique, using both color and magnitude information of events fro…
Gemini Spectroscopy of Supernovae from SNLS: Improving High Redshift SN Selection and Classification
D. A. Howell, M. Sullivan, K. Perrett +22
We present new techiques for improving the efficiency of supernova (SN) classification at high redshift using 64 candidates observed at Gemini North and South during the first year…
Spectra of High-Redshift Type Ia Supernovae and a Comparison with their Low-Redshift Counterparts
I. M. Hook, D. A. Howell, G. Aldering +32
We present spectra for 14 high-redshift (0.17 < z < 0.83) supernovae, which were discovered by the Supernova Cosmology Project as part of a campaign to measure cosmological paramet…
A Definitive Measurement of Time Dilation in the Spectral Evolution of the Moderate-Redshift Type Ia Supernova 1997ex
R. J. Foley, A. V. Filippenko, D. C. Leonard +3
We have obtained high-quality Keck optical spectra at three epochs of the Type Ia supernova 1997ex, whose redshift z is 0.361. The elapsed calendar time between the first two spect…