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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
NTT and NOT spectroscopy of SDSS-II supernovae
Astronomy and Astrophysics, Volume 526, No. 4, Article A28, Year 2011
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Description
Context. The Sloan Digital Sky Survey II (SDSS-II) Supernova Survey, conducted between 2005 and 2007, was designed to detect a large number of type Ia supernovae around z ∼ 0.2, the redshift "gap" between low-z and high-z supernova searches. The survey has provided multi-band (ugriz) photometric lightcurves for variable targets, and supernova candidates were scheduled for spectroscopic observations, primarily to provide supernova classification and accurate redshifts. We present supernova spectra obtained in 2006 and 2007 using the New Technology Telescope (NTT) and the Nordic Optical Telescope (NOT). Aims. We provide an atlas of supernova spectra in the range z = 0.03-0.32that complements the well-sampled lightcurves from SDSS-II in the forthcoming three-year SDSS supernova cosmology analysis. The sample can, for example, be used for spectral studies of type Ia supernovae, which are critical for understanding potential systematic effects when supernovae are used to determine cosmological distances. Methods. The spectra were reduced in a uniform manner, and special care was taken in estimating the uncertainties for the different processing steps. Host-galaxy light was subtracted when possible and the supernova type fitted using the SuperNova IDentification code (SNID). We also present comparisons between spectral and photometric dating using SALT lightcurve fits to the photometry from SDSS-II, as well as the global distribution of our sample in terms of the lightcurve parameters: stretch and colour. Results. We report new spectroscopic data from 141 type Ia supernovae, mainly between -9 and +15 days from lightcurve maximum, including a few cases of multi-epoch observations. This homogeneous, host-galaxy subtracted, type Ia supernova spectroscopic sample is among the largest such data sets and unique in its redshift interval. The sample includes two potential SN 1991T-like supernovae (SN 2006on and SN 2007ni) and one potential SN 2002cx-like supernova (SN 2007ie). In addition, the new compilation includes spectra from 23 confirmed type II and 8 type Ib/c supernovae. © 2010 ESO.
Authors & Co-Authors
Östman, Linda
Sweden, Stockholm
Stockholms Universitet
Spain, Cerdanyola Del Valles
Institut de Física D'altes Energies, Bellaterra
Sweden, Stockholm
Albanova Universitetscentrum
Nordin, Jakob
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Albanova Universitetscentrum
Goobar, Ariel M.
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Albanova Universitetscentrum
Amanullah, Rahman
Sweden, Stockholm
Stockholms Universitet
Sweden, Stockholm
Albanova Universitetscentrum
Smith, Matthew W.L.
United Kingdom, Portsmouth
University of Portsmouth
South Africa, Cape Town
University of Cape Town
Sollerman, Jesper
Sweden, Stockholm
Albanova Universitetscentrum
Sweden, Stockholm
Stockholms Universitet
Denmark, Copenhagen
Niels Bohr Institutet
Stanishev, Vallery
Portugal, Lisbon
Instituto Superior Técnico
Stritzinger, Maximilian D.
Sweden, Stockholm
Albanova Universitetscentrum
Denmark, Copenhagen
Niels Bohr Institutet
Chile, La Serena
Carnegie Institute for Science
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
Davis, Tamara M.
Denmark, Copenhagen
Niels Bohr Institutet
Australia, Brisbane
The University of Queensland
Edmondson, Edward M.
United Kingdom, Portsmouth
University of Portsmouth
Frieman, Joshua A.
United States, Batavia
Fermi National Accelerator Laboratory
United States, Chicago
The Kavli Institute for Cosmological Physics
Garnavich, Peter M.
United States, Notre Dame
University of Notre Dame
Lampeitl, Hubert
United Kingdom, Portsmouth
University of Portsmouth
Leloudas, Giorgos
Denmark, Copenhagen
Niels Bohr Institutet
Marriner, John P.
United States, Batavia
Fermi National Accelerator Laboratory
Nichol, Robert C.
United Kingdom, Portsmouth
University of Portsmouth
Römer, Anita Kathy
United Kingdom, Brighton
University of Sussex
Sako, Masao
United States, Philadelphia
University of Pennsylvania
P. Schneider, Donald P.
United States, University Park
Pennsylvania State University
Zheng, C.
United States, Stanford
Kavli Institute for Particle Astrophysics and Cosmology
Statistics
Citations: 37
Authors: 21
Affiliations: 18
Identifiers
Doi:
10.1051/0004-6361/201015704
ISSN:
00046361
e-ISSN:
14320746
Study Design
Cross Sectional Study
Study Approach
Quantitative