Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples

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dc.contributor.authorBetoule, M
dc.contributor.authorKessler, R
dc.contributor.authorGuy, J
dc.contributor.authorMosher, J
dc.contributor.authorHardin, D
dc.contributor.authorBiswas, R
dc.contributor.authorAstier, P
dc.contributor.authorEl-Hage, P
dc.contributor.authorKonig, M
dc.contributor.authorKuhlmann, S
dc.contributor.authorMarriner, J
dc.contributor.authorPain, R
dc.contributor.authorRegnault, N
dc.contributor.authorBalland, C
dc.contributor.authorBassett, B A
dc.contributor.authorBrown, P J
dc.contributor.authorCampbell, H
dc.contributor.authorCarlberg, R G
dc.contributor.authorCellier-Holzem, F
dc.contributor.authorCinabro, D
dc.contributor.authorConley, A
dc.contributor.authorD’Andrea, C B
dc.contributor.authorDePoy, D L
dc.contributor.authorDoi, M
dc.contributor.authorEllis, R S
dc.contributor.authorFabbro, S
dc.contributor.authorFilippenko, A V
dc.contributor.authorFoley, R J
dc.contributor.authorFrieman, J A
dc.contributor.authorFouchez, D
dc.contributor.authorGalbany, L
dc.contributor.authorGoobar, A
dc.date.accessioned2021-10-07T09:30:09Z
dc.date.available2021-10-07T09:30:09Z
dc.date.issued2014
dc.description.abstractAims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z < 0:1), all three seasons from the SDSS-II (0:05 < z < 0:4), and three years from SNLS (0:2 < z < 1), and it totals 740 spectroscopically confirmed type Ia supernovae with high-quality light curves. Methods. We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: 1) the addition of the full SDSS-II spectroscopically-confirmed SN Ia sample in both the training of the SALT2 light-curve model and in the Hubble diagram analysis (374 SNe); 2) intercalibration of the SNLS and SDSS surveys and reduced systematic uncertainties in the photometric calibration, performed blindly with respect to the cosmology analysis; and 3) a thorough investigation of systematic errors associated with the SALT2 modeling of SN Ia light curves. Results. We produce recalibrated SN Ia light curves and associated distances for the SDSS-II and SNLS samples. The large SDSS-II sample provides an eective, independent, low-z anchor for the Hubble diagram and reduces the systematic error from calibration systematics in the low-z SN sample. For a flat CDM cosmology, we find m = 0:295 0:034 (stat+sys), a value consistent with the most recent cosmic microwave background (CMB) measurement from the Planck and WMAP experiments. Our result is 1:8 (stat+sys) dierent than the previously published result of SNLS three-year data. The change is due primarily to improvements in the SNLS photometric calibration. When combined with CMB constraints, we measure a constant dark-energy equation of state parameter w = ?1:018 0:057 (stat+sys) for a flat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: w = ?1:0270:055. Our supernova measurements provide the most stringent constraints to date on the nature of dark energy.
dc.identifier.apacitationBetoule, M., Kessler, R., Guy, J., Mosher, J., Hardin, D., Biswas, R., ... Goobar, A. (2014). Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples. <i>Astronomy and Astrophysics</i>, 568(4), A22 - 177. http://hdl.handle.net/11427/34186en_ZA
dc.identifier.chicagocitationBetoule, M, R Kessler, J Guy, J Mosher, D Hardin, R Biswas, P Astier, et al "Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples." <i>Astronomy and Astrophysics</i> 568, 4. (2014): A22 - 177. http://hdl.handle.net/11427/34186en_ZA
dc.identifier.citationBetoule, M., Kessler, R., Guy, J., Mosher, J., Hardin, D., Biswas, R., Astier, P. & El-Hage, P. et al. 2014. Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples. <i>Astronomy and Astrophysics.</i> 568(4):A22 - 177. http://hdl.handle.net/11427/34186en_ZA
dc.identifier.issn0004-6361
dc.identifier.issn1432-0746
dc.identifier.ris TY - Journal Article AU - Betoule, M AU - Kessler, R AU - Guy, J AU - Mosher, J AU - Hardin, D AU - Biswas, R AU - Astier, P AU - El-Hage, P AU - Konig, M AU - Kuhlmann, S AU - Marriner, J AU - Pain, R AU - Regnault, N AU - Balland, C AU - Bassett, B A AU - Brown, P J AU - Campbell, H AU - Carlberg, R G AU - Cellier-Holzem, F AU - Cinabro, D AU - Conley, A AU - D’Andrea, C B AU - DePoy, D L AU - Doi, M AU - Ellis, R S AU - Fabbro, S AU - Filippenko, A V AU - Foley, R J AU - Frieman, J A AU - Fouchez, D AU - Galbany, L AU - Goobar, A AB - Aims. We present cosmological constraints from a joint analysis of type Ia supernova (SN Ia) observations obtained by the SDSS-II and SNLS collaborations. The dataset includes several low-redshift samples (z < 0:1), all three seasons from the SDSS-II (0:05 < z < 0:4), and three years from SNLS (0:2 < z < 1), and it totals 740 spectroscopically confirmed type Ia supernovae with high-quality light curves. Methods. We followed the methods and assumptions of the SNLS three-year data analysis except for the following important improvements: 1) the addition of the full SDSS-II spectroscopically-confirmed SN Ia sample in both the training of the SALT2 light-curve model and in the Hubble diagram analysis (374 SNe); 2) intercalibration of the SNLS and SDSS surveys and reduced systematic uncertainties in the photometric calibration, performed blindly with respect to the cosmology analysis; and 3) a thorough investigation of systematic errors associated with the SALT2 modeling of SN Ia light curves. Results. We produce recalibrated SN Ia light curves and associated distances for the SDSS-II and SNLS samples. The large SDSS-II sample provides an eective, independent, low-z anchor for the Hubble diagram and reduces the systematic error from calibration systematics in the low-z SN sample. For a flat CDM cosmology, we find m = 0:295 0:034 (stat+sys), a value consistent with the most recent cosmic microwave background (CMB) measurement from the Planck and WMAP experiments. Our result is 1:8 (stat+sys) dierent than the previously published result of SNLS three-year data. The change is due primarily to improvements in the SNLS photometric calibration. When combined with CMB constraints, we measure a constant dark-energy equation of state parameter w = ?1:018 0:057 (stat+sys) for a flat universe. Adding baryon acoustic oscillation distance measurements gives similar constraints: w = ?1:0270:055. Our supernova measurements provide the most stringent constraints to date on the nature of dark energy. DA - 2014 DB - OpenUCT DP - University of Cape Town IS - 4 J1 - Astronomy and Astrophysics LK - https://open.uct.ac.za PY - 2014 SM - 0004-6361 SM - 1432-0746 T1 - Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples TI - Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples UR - http://hdl.handle.net/11427/34186 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34186
dc.identifier.vancouvercitationBetoule M, Kessler R, Guy J, Mosher J, Hardin D, Biswas R, et al. Improved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples. Astronomy and Astrophysics. 2014;568(4):A22 - 177. http://hdl.handle.net/11427/34186.en_ZA
dc.language.isoeng
dc.publisher.departmentDepartment of Astronomy
dc.publisher.facultyFaculty of Science
dc.sourceAstronomy and Astrophysics
dc.source.journalissue4
dc.source.journalvolume568
dc.source.paginationA22 - 177
dc.source.urihttps://dx.doi.org/10.1051/0004-6361/201423413
dc.subject.othercosmology: observations
dc.subject.otherdistance scale dark energy
dc.subject.otherdigital sky survey
dc.subject.otherhubble-space-telescope
dc.subject.otherbaryon
dc.subject.otheracoustic-oscillations
dc.subject.otheria light curves
dc.subject.othermicrowave background
dc.subject.otheranisotropies
dc.subject.otherphotometry data release
dc.subject.otherhost galaxy properties
dc.subject.otherdark
dc.subject.otherenergy survey
dc.subject.otherlegacy survey
dc.subject.otherlow-redshift
dc.subject.otherastronomy
dc.subject.otherastrophysics
dc.subject.otherArticle
dc.titleImproved cosmological constraints from a joint analysis of the SDSS-II and SNLS supernova samples
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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