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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Spectral properties of type Ia supernovae up to z ~ 0.3
Astronomy and Astrophysics, Volume 526, No. 15, Article A119, Year 2011
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Description
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 Supernova Survey, are analysed. We use spectral indicators measured up to a month after the lightcurve peak luminosity to characterise the supernova properties, and examine these for potential correlations with host galaxy type, lightcurve shape, colour excess, and redshift. Methods. Our analysis is based on 89 type Ia supernovae at a redshift interval z = 0.05-0.3, for which multiband SDSS photometry is available. A lower-z spectroscopy reference sample was used for comparisons over cosmic time. We present measurements of time series of pseudo equivalent widths and line velocities of the main spectral features in type Ia supernovae. Results. Supernovae with shallower features are found predominantly among the intrinsically brighter slow declining supernovae. We detect the strongest correlation between lightcurve stretch and the Si ii λ4000 absorption feature, which also correlates with the estimated mass and star formation rate of the host galaxy. We also report a tentative correlation between colour excess and spectral properties. If confirmed, this would suggest that moderate reddening of type Ia supernovae is dominated by effects in the explosion or its immediate environment, as opposed to extinction by interstellar dust. © ESO, 2011.
Authors & Co-Authors
Nordin, Jakob
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Östman, Linda
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Goobar, Ariel M.
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Amanullah, Rahman
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Oskar Klein Centre
Nichol, Robert C.
United Kingdom, Portsmouth
University of Portsmouth
Smith, Matthew W.L.
United Kingdom, Portsmouth
University of Portsmouth
South Africa, Cape Town
University of Cape Town
Sollerman, Jesper
Sweden, Stockholm
Oskar Klein Centre
Denmark, Copenhagen
Niels Bohr Institutet
Sweden, Stockholm
Stockholms Universitet
Bassett, Bruce A.C.C.
South Africa, Cape Town
University of Cape Town
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Muizenberg
African Institute for Mathematical Sciences
Frieman, Joshua A.
United States, Batavia
Fermi National Accelerator Laboratory
United States, Chicago
The Kavli Institute for Cosmological Physics
Garnavich, Peter M.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
United States, Notre Dame
University of Notre Dame
Leloudas, Giorgos
Denmark, Copenhagen
Niels Bohr Institutet
Sako, Masao
United States, Philadelphia
University of Pennsylvania
P. Schneider, Donald P.
United States, University Park
Pennsylvania State University
Statistics
Citations: 27
Authors: 13
Affiliations: 14
Identifiers
Doi:
10.1051/0004-6361/201015705
ISSN:
00046361
e-ISSN:
14320746
Study Design
Cross Sectional Study
Study Approach
Quantitative