A hubble diagram from TYPE II supernovae based solely on photometry: the photometric color methodReport as inadecuate




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We present a Hubble diagram of SNe II using corrected magnitudes derived only from photometry, with no inputof spectral information. We use a data set from the Carnegie Supernovae Project I for which optical and nearinfraredlight curves were obtained. The apparent magnitude is corrected by two observables, one corresponding tothe slope of the plateau in the V band and the second a color term. We obtain a dispersion of 0.44 mag using acombination of the V − i color and the r band and we are able to reduce the dispersion to 0.39 mag using ourgolden sample. A comparison of our photometric color method PCM with the standardized candle method SCMis also performed. The dispersion obtained for the SCM which uses both photometric and spectroscopicinformation is 0.29 mag, which compares with 0.43 mag from the PCM for the same SN sample. The constructionof a photometric Hubble diagram is of high importance in the coming era of large photometric wide-field surveys,which will increase the detection rate of supernovae by orders of magnitude. Such numbers will prohibitspectroscopic follow up in the vast majority of cases, and hence methods must be deployed which can proceedusing solely photometric data.Nota general

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Author: de Jaeger, T.; - González Gaitán, Sebastián; - Anderson, J. P.; - Galbany, Lluis; - Hamuy Wackenhut, Mario; - Phillips, M. M.;

Source: http://repositorio.uchile.cl/



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