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We present a Hubble diagram of type II supernovae using corrected magnitudesderived only from photometry, with no input of spectral information. We use adata set from the Carnegie Supernovae Project I (CSP) for which optical andnear-infrared light-curves were obtained. The apparent magnitude is correctedby two observables, one corresponding to the slope of the plateau in the $V$band and the second a colour term. We obtain a dispersion of 0.44 mag using acombination of the $(V-i)$ colour and the $r$ band and we are able to reducethe dispersion to 0.39 mag using our golden sample. A comparison of ourphotometric colour method (PCM) with the standardised candle method (SCM) isalso performed. The dispersion obtained for the SCM (which uses bothphotometric and spectroscopic information) is 0.29 mag which compares with 0.43mag from the PCM, for the same SN sample. The construction of a photometricHubble diagram is of high importance in the coming era of large photometricwide-field surveys, which will increase the detection rate of supernovae byorders of magnitude. Such numbers will prohibit spectroscopic follow-up in thevast majority of cases, and hence methods must be deployed which can proceedusing solely photometric data.

A Hubble diagram from Type II Supernovae based solely on photometry: the Photometric-Colour Method