A Type II Supernova Hubble Diagram from the CSP-I, SDSS-II, and SNLS Surveys

GONZÁLEZ-GAITÁN, S.; ANDERSON, J.P.; CARLBERG, R.G.; HOOK, I.M.; KUNCARAYAKTI, H.; PRITCHET, C.; JAEGER, T. DE; GALBANY, L.; STRITZINGER, M.D.; GUTIÉRREZ, C.P.; HSIAO, E.Y.; FOLATELLI, G.; HAMUY, M.; PHILLIPS, M.M.; SULLIVAN, M.; HOWELL, D. ANDREW; RUHLMANN-KLEIDER, V.; BASA, S.

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Año: 2017 vol. 835

0004-637X

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 (SNe II) 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 Color Method (PCM) to 73 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, i.e., 13% in distance uncertainties, is derived. 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 the universes matter density: m= 0.32 m+0.30 - 0.21 providing a new independent evidence for dark energy at the level of two sigma.