NTT and NOT spectroscopy of SDSS-II supernovae

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dc.contributor.authorÖstman, L
dc.contributor.authorNordin, J
dc.contributor.authorGoobar, A
dc.contributor.authorAmanullah, R
dc.contributor.authorSmith, M
dc.contributor.authorSollerman, J
dc.contributor.authorStanishev, V
dc.contributor.authorStritzinger, M D
dc.contributor.authorBassett, B A
dc.contributor.authorDavis, T M
dc.contributor.authorEdmondson, E
dc.contributor.authorFrieman, J A
dc.contributor.authorGarnavich, P M
dc.contributor.authorLampeitl, H
dc.contributor.authorLeloudas, G
dc.contributor.authorMarriner, J
dc.contributor.authorNichol, R C
dc.contributor.authorRomer, K
dc.contributor.authorSako, M
dc.contributor.authorSchneider, D P
dc.contributor.authorZheng, C
dc.date.accessioned2021-10-08T11:01:05Z
dc.date.available2021-10-08T11:01:05Z
dc.date.issued2011
dc.description.abstractContext. 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 = 0.03−0.32 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. 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.
dc.identifier.apacitationÖstman, L., Nordin, J., Goobar, A., Amanullah, R., Smith, M., Sollerman, J., ... Zheng, C. (2011). NTT and NOT spectroscopy of SDSS-II supernovae. <i>Astronomy and Astrophysics</i>, 526(4), A28 - 177. http://hdl.handle.net/11427/35083en_ZA
dc.identifier.chicagocitationÖstman, L, J Nordin, A Goobar, R Amanullah, M Smith, J Sollerman, V Stanishev, et al "NTT and NOT spectroscopy of SDSS-II supernovae." <i>Astronomy and Astrophysics</i> 526, 4. (2011): A28 - 177. http://hdl.handle.net/11427/35083en_ZA
dc.identifier.citationÖstman, L., Nordin, J., Goobar, A., Amanullah, R., Smith, M., Sollerman, J., Stanishev, V. & Stritzinger, M.D. et al. 2011. NTT and NOT spectroscopy of SDSS-II supernovae. <i>Astronomy and Astrophysics.</i> 526(4):A28 - 177. http://hdl.handle.net/11427/35083en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Östman, L AU - Nordin, J AU - Goobar, A AU - Amanullah, R AU - Smith, M AU - Sollerman, J AU - Stanishev, V AU - Stritzinger, M D AU - Bassett, B A AU - Davis, T M AU - Edmondson, E AU - Frieman, J A AU - Garnavich, P M AU - Lampeitl, H AU - Leloudas, G AU - Marriner, J AU - Nichol, R C AU - Romer, K AU - Sako, M AU - Schneider, D P AU - Zheng, C AB - 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 = 0.03−0.32 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. 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. DA - 2011 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2011 SM - 0004-6361 SM - 1432-0746 T1 - NTT and NOT spectroscopy of SDSS-II supernovae TI - NTT and NOT spectroscopy of SDSS-II supernovae UR - http://hdl.handle.net/11427/35083 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/35083
dc.identifier.vancouvercitationÖstman L, Nordin J, Goobar A, Amanullah R, Smith M, Sollerman J, et al. NTT and NOT spectroscopy of SDSS-II supernovae. Astronomy and Astrophysics. 2011;526(4):A28 - 177. http://hdl.handle.net/11427/35083.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Mathematics and Applied Mathematics
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue4
dc.source.journalvolume526
dc.source.paginationA28 - 177
dc.source.urihttps://dx.doi.org/10.1051/0004-6361/201015704
dc.subject.othermethods: observational
dc.subject.othertechniques: spectroscopic
dc.subject.othersupernovae: general
dc.subject.othersurveys
dc.subject.othercosmology: observations
dc.titleNTT and NOT spectroscopy of SDSS-II supernovae
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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