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

• Autores: Jaeger, T. de; González Gaitán, S.; Hamuy, M.; Galbany, L.; Anderson, J. P.; Phillips, M. M.; Stritzinger, M. D.; Carlberg, R. G.; Sullivan, M.; Gutiérrez, C. P.; Hook, I. M.; Howell, D. A.; Hsiao, E. Y.; Kuncarayakti, H.; Ruhlmann Kleider, V.; Folatelli, Gastón; Pritchet, C.; Basa, S.
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Ciencias Astronómicas; galaxies: distances and redshifts; supernovae: general; words: distance scale
• Institución: Universidad Nacional de La Plata

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: Ω_m = 0.32^+0.30_-0.21 providing a new independent evidence for dark energy at the level of two sigma.
Facultad de Ciencias Astronómicas y Geofísicas
Instituto de Astrofísica de La Plata