Updated Type II supernova Hubble diagram

Specifically, we apply the expanding photosphere method (EPM) and the standardized candle method (SCM) to each target, and find that both methods yield distances that are in reasonable agreement with each other. The current record-holder for the highest-redshift spectroscopically confirmed SN II-P is PS1-13bni (z=0.335^+0.009^_-0.012_), and illustrates the promise of Type II SNe as cosmological tools.

We updated existing EPM and SCM Hubble diagrams by adding our sample to those previously published. Within the context of Type II SN distance measuring techniques, we investigated two related questions. First, we explored the possibility of utilising spectral lines other than the traditionally used FeII {lambda}5169 to infer the photospheric velocity of SN ejecta.