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arXiv · 1612.05636

A Type II Supernova Hubble diagram from the CSP-I, SDSS-II, and SNLS surveys

T. de Jaeger·S. González-Gaitán·M. Hamuy·L. Galbany·J. P. Anderson·M. M. Phillips·M. D. Stritzinger·R. G. Carlberg·M. Sullivan·C. P. Gutiérrez·I. M. Hook·D. Andrew Howell·E. Y. Hsiao·H. Kuncarayakti·V. Ruhlmann-Kleider·G. Folatelli·C. Pritchet·S. Basa
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Abstract

The coming era of large photometric wide-field surveys will increase the detection rate of supernovae by orders of magnitude. Such numbers will restrict spectroscopic follow-up in the vast majority of cases, and hence new methods based solely on photometric data must be developed. Here, we construct a complete Hubble diagram of Type II supernovae combining data from three different samples: the Carnegie Supernova Project-I, the Sloan Digital Sky Survey-II SN, and the Supernova Legacy Survey. Applying the Photometric Colour Method (PCM) to 73 Type II supernovae (SNe~II) with a redshift range of 0.01--0.5 and with no spectral information, we derive an intrinsic dispersion of 0.35 mag. A comparison with the Standard Candle Method (SCM) using 61 SNe~II is also performed and an intrinsic dispersion in the Hubble diagram of 0.27 mag is derived, i.e., 13\% in distance uncertainties. Due to the lack of good statistics at higher redshifts for both methods, only weak constraints on the cosmological parameters are obtained. However, assuming a flat Universe and using the PCM, we derive a Universe's matter density: $\Omega_{m}$=0.32$^{+0.30}_{-0.21}$ providing a new independent evidence for dark energy at the level of two sigma.

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T. de Jaeger, S. González-Gaitán, M. Hamuy, L. Galbany, J. P. Anderson, M. M. Phillips, M. D. Stritzinger, R. G. Carlberg, M. Sullivan, C. P. Gutiérrez, I. M. Hook, D. Andrew Howell, E. Y. Hsiao, H. Kuncarayakti, V. Ruhlmann-Kleider, G. Folatelli, C. Pritchet, S. Basa. 2016-12-16. A Type II Supernova Hubble diagram from the CSP-I, SDSS-II, and SNLS surveys. https://doi.org/10.3847/1538-4357%2F835%2F2%2F166

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