NTT and NOT spectroscopy of SDSS-II supernovae

Ostman, L., Nordin, J., Goobar, A., Amanullah, R., Smith, M., Sollerman, J., Stanishev, V., Stritzinger, M. D., Bassett, B. A., Davis, T. M., Edmondson, E., Frieman, J. A., Garnavich, P. M., Lampeitl, H., Leloudas, G., Marriner, J., Nichol, R. C., Romer, K., Sako, M, Schneider, D. P. and Zheng, C. (2011) NTT and NOT spectroscopy of SDSS-II supernovae. Astronomy & Astrophysics, 526 4: 1-28. doi:10.1051/0004-6361/201015704

Author Ostman, L.
Nordin, J.
Goobar, A.
Amanullah, R.
Smith, M.
Sollerman, J.
Stanishev, V.
Stritzinger, M. D.
Bassett, B. A.
Davis, T. M.
Edmondson, E.
Frieman, J. A.
Garnavich, P. M.
Lampeitl, H.
Leloudas, G.
Marriner, J.
Nichol, R. C.
Romer, K.
Sako, M
Schneider, D. P.
Zheng, C.
Title NTT and NOT spectroscopy of SDSS-II supernovae
Journal name Astronomy & Astrophysics   Check publisher's open access policy
ISSN 0004-6361
Publication date 2011-02
Year available 2010
Sub-type Article (original research)
DOI 10.1051/0004-6361/201015704
Open Access Status DOI
Volume 526
Issue 4
Start page 1
End page 28
Total pages 28
Place of publication Les Ulis, France
Publisher E D P Sciences
Collection year 2012
Language eng
Formatted abstract
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).

We provide an atlas of supernova spectra in the range z = 0.03–0.32 that 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.

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.
Keyword Methods: observational
Techniques: spectroscopic
Supernovae: general
Cosmology: observations
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online 16 December 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mathematics and Physics
Official 2012 Collection
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Created: Sun, 20 Feb 2011, 00:06:46 EST