A more general model for the intrinsic scatter in type Ia supernova distance moduli

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dc.contributor.authorMarriner, John
dc.contributor.authorBernstein, J P
dc.contributor.authorKessler, Richard
dc.contributor.authorLampeitl, Hubert
dc.contributor.authorMiquel, Ramon
dc.contributor.authorMosher, Jennifer
dc.contributor.authorNichol, Robert C
dc.contributor.authorSako, Masao
dc.contributor.authorSchneider, Donald P
dc.contributor.authorSmith, Mathew
dc.date.accessioned2021-10-08T07:20:36Z
dc.date.available2021-10-08T07:20:36Z
dc.date.issued2011
dc.description.abstractWe describe a new formalism to fit the parameters {alpha} and {beta} that are used in the SALT2 model to determine the standard magnitudes of Type Ia supernovae (SNe Ia). The new formalism describes the intrinsic scatter in SNe Ia by a covariance matrix in place of the single parameter normally used. We have applied this formalism to the Sloan Digital Sky Survey Supernova Survey (SDSS-II) data and conclude that the data are best described by {alpha} = 0.135{sup +.033} - .017 and {beta} = 3.19{sup +0.14} - 0.24, where the error is dominated by the uncertainty in the form of the intrinsic scatter matrix. Our result depends on the introduction of a more general form for the intrinsic scatter of the distance moduli of SNe Ia than is conventional, resulting in a larger value of {beta} and a larger uncertainty than the conventional approach. Although this analysis results in a larger value of {beta} and a larger error, the SDSS data differ (at a 98% confidence level) from {beta} = 4.1, the value expected for extinction by the type of dust found in the Milky Way. We have modeled the distribution of SNe Ia in terms of their colormore » and conclude that there is strong evidence that variation in color is a significant contributor to the scatter of SNe Ia around their standard candle magnitude.« less
dc.identifier.apacitationMarriner, J., Bernstein, J. P., Kessler, R., Lampeitl, H., Miquel, R., Mosher, J., ... Smith, M. (2011). A more general model for the intrinsic scatter in type Ia supernova distance moduli. <i>The Astrophysical Journal</i>, 740(2), 72 - 177. http://hdl.handle.net/11427/34963en_ZA
dc.identifier.chicagocitationMarriner, John, J P Bernstein, Richard Kessler, Hubert Lampeitl, Ramon Miquel, Jennifer Mosher, Robert C Nichol, Masao Sako, Donald P Schneider, and Mathew Smith "A more general model for the intrinsic scatter in type Ia supernova distance moduli." <i>The Astrophysical Journal</i> 740, 2. (2011): 72 - 177. http://hdl.handle.net/11427/34963en_ZA
dc.identifier.citationMarriner, J., Bernstein, J.P., Kessler, R., Lampeitl, H., Miquel, R., Mosher, J., Nichol, R.C. & Sako, M. et al. 2011. A more general model for the intrinsic scatter in type Ia supernova distance moduli. <i>The Astrophysical Journal.</i> 740(2):72 - 177. http://hdl.handle.net/11427/34963en_ZA
dc.identifier.issn0004-637X
dc.identifier.issn1538-4357
dc.identifier.ris TY - Journal Article AU - Marriner, John AU - Bernstein, J P AU - Kessler, Richard AU - Lampeitl, Hubert AU - Miquel, Ramon AU - Mosher, Jennifer AU - Nichol, Robert C AU - Sako, Masao AU - Schneider, Donald P AU - Smith, Mathew AB - We describe a new formalism to fit the parameters {alpha} and {beta} that are used in the SALT2 model to determine the standard magnitudes of Type Ia supernovae (SNe Ia). The new formalism describes the intrinsic scatter in SNe Ia by a covariance matrix in place of the single parameter normally used. We have applied this formalism to the Sloan Digital Sky Survey Supernova Survey (SDSS-II) data and conclude that the data are best described by {alpha} = 0.135{sup +.033} - .017 and {beta} = 3.19{sup +0.14} - 0.24, where the error is dominated by the uncertainty in the form of the intrinsic scatter matrix. Our result depends on the introduction of a more general form for the intrinsic scatter of the distance moduli of SNe Ia than is conventional, resulting in a larger value of {beta} and a larger uncertainty than the conventional approach. Although this analysis results in a larger value of {beta} and a larger error, the SDSS data differ (at a 98% confidence level) from {beta} = 4.1, the value expected for extinction by the type of dust found in the Milky Way. We have modeled the distribution of SNe Ia in terms of their colormore » and conclude that there is strong evidence that variation in color is a significant contributor to the scatter of SNe Ia around their standard candle magnitude.« less DA - 2011 DB - OpenUCT DP - University of Cape Town IS - 2 J1 - The Astrophysical Journal LK - https://open.uct.ac.za PY - 2011 SM - 0004-637X SM - 1538-4357 T1 - A more general model for the intrinsic scatter in type Ia supernova distance moduli TI - A more general model for the intrinsic scatter in type Ia supernova distance moduli UR - http://hdl.handle.net/11427/34963 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/34963
dc.identifier.vancouvercitationMarriner J, Bernstein JP, Kessler R, Lampeitl H, Miquel R, Mosher J, et al. A more general model for the intrinsic scatter in type Ia supernova distance moduli. The Astrophysical Journal. 2011;740(2):72 - 177. http://hdl.handle.net/11427/34963.en_ZA
dc.language.isoeng
dc.publisher.departmentCosmology and Gravity Group
dc.publisher.facultyFaculty of Science
dc.sourceThe Astrophysical Journal
dc.source.journalissue2
dc.source.journalvolume740
dc.source.pagination72 - 177
dc.source.urihttps://dx.doi.org/10.1088/0004-637X/740/2/72
dc.subject.otherclassical and quantum mechanics
dc.subject.othergeneral physics
dc.subject.otherastrophysics
dc.subject.othercosmology and astronomy
dc.subject.othercolor
dc.subject.otherdistribution
dc.subject.otherdusts
dc.subject.othermilky way
dc.subject.othersky
dc.subject.othersupernovae astrophysics
dc.titleA more general model for the intrinsic scatter in type Ia supernova distance moduli
dc.typeJournal Article
uct.type.publicationResearch
uct.type.resourceJournal Article
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