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7 papers · 1 filter
The effect of peculiar velocities on supernova cosmology
Tamara M Davis, Lam Hui, Joshua A Frieman +11
We present an analysis of peculiar velocities and their effect on supernova cosmology. In particular, we study (a) the corrections due to our own motion, (b) the effects of correla…
Spectral properties of Type Ia supernovae up to z~0.3
J. Nordin, L. Ostman, A. Goobar +10
Aims: Spectroscopic observations of Type Ia supernovae obtained at the New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT), in conjunction with the SDSS-II Supern…
NTT and NOT spectroscopy of SDSS-II supernovae
L. Ostman, J. Nordin, A. Goobar +18
Context. The SDSS-II Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of Type Ia supernovae (SNe Ia) around z~0.2, the redshift "gap" betwee…
Statistical Classification Techniques for Photometric Supernova Typing
James Newling, Melvin Varughese, Bruce A. Bassett +8
Future photometric supernova surveys will produce vastly more candidates than can be followed up spectroscopically, highlighting the need for effective classification methods based…
A Mismatch in the Ultraviolet Spectra between Low-Redshift and Intermediate-Redshift Type Ia Supernovae as a Possible Systematic Uncertainty for Supernova Cosmology
Ryan J. Foley, Alexei V. Filippenko, Richard Kessler +11
We present Keck high-quality rest-frame ultraviolet (UV) through optical spectra of 21 Type Ia supernovae (SNe Ia) in the redshift range 0.11 < z < 0.37 and a mean redshift of 0.22…
Fundamental Uncertainty in the BAO Scale from Isocurvature Modes
C. Zunckel, P. Okouma, S. Muya Kasanda +2
Small fractions of isocurvature perturbations correlated with the dominant adiabatic mode are shown to be a significant primordial systematic for future Baryon Acoustic Oscillation…