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Using Line Profiles to Test the Fraternity of Type Ia Supernovae at High and Low Redshifts
S. Blondin, L. Dessart, B. Leibundgut +34
Using archival data of low-redshift (z < 0.01) Type Ia supernovae (SN Ia) and recent observations of high-redshift (0.16 < z <0.64; Matheson et al. 2005) SN Ia, we study the "unifo…
Hubble Space Telescope and Ground-Based Observations of Type Ia Supernovae at Redshift 0.5: Cosmological Implications
A. Clocchiatti, B. Schmidt, A. Filippenko +26
We present observations of the Type Ia supernovae (SNe) 1999M, 1999N, 1999Q, 1999S, and 1999U, at redshift z~0.5. They were discovered in early 1999 with the 4.0~m Blanco telescope…
Hubble Space Telescope Observations of Nine High-Redshift ESSENCE Supernovae
Kevin Krisciunas, Peter M. Garnavich, Peter Challis +29
We present broad-band light curves of nine supernovae ranging in redshift from 0.5 to 0.8. The supernovae were discovered as part of the ESSENCE project, and the light curves are a…
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…