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Title

Type II-P Supernovae from the SDSS-II Supernova Survey and the Standardized Candle Method

AuthorsD'Andrea, Chris B.; Castander, Francisco J. ; Stritzinger, Maximilian
KeywordsCosmology: observations
Distance scale
Supernovae: general
Surveys
Issue DateJan-2010
PublisherAmerican Astronomical Society
CitationAstrophysical Journal 708 (1) : 661 (2010)
AbstractWe apply the Standardized Candle Method (SCM) for Type II Plateau supernovae (SNe II-P), which relates the velocity of the ejecta of a SN to its luminosity during the plateau, to 15 SNe II-P discovered over the three season run of the Sloan Digital Sky Survey-II Supernova Survey. The redshifts of these SNe—0.027 < z < 0.144—cover a range hitherto sparsely sampled in the literature; in particular, our SNe II-P sample contains nearly as many SNe in the Hubble flow (z > 0.01) as all of the current literature on the SCM combined. We find that the SDSS SNe have a very small intrinsic I-band dispersion (0.22 mag), which can be attributed to selection effects. When the SCM is applied to the combined SDSS-plus-literature set of SNe II-P, the dispersion increases to 0.29 mag, larger than the scatter for either set of SNe separately. We show that the standardization cannot be further improved by eliminating SNe with positive plateau decline rates, as proposed in Poznanski et al. We thoroughly examine all potential systematic effects and conclude that for the SCM to be useful for cosmology, the methods currently used to determine the Fe II velocity at day 50 must be improved, and spectral templates able to encompass the intrinsic variations of Type II-P SNe will be needed.
DescriptionPublicado en línea el 15 de diciembre de 2009.
Publisher version (URL)http://dx.doi.org/10.1088/0004-637X/708/1/661
URIhttp://hdl.handle.net/10261/37969
DOI10.1088/0004-637X/708/1/661
ISSN0004-637X
E-ISSN1538-4357
Appears in Collections:(ICE) Artículos
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