Cosmological constraints from measurements of type Ia supernovae discovered during the first 1.5 yr of the Pan-STARRS1 survey
Abstract
We present grizP1 light curves of 146 spectroscopically confirmed Type Ia supernovae (SNe Ia 0.03 < z < 0.65) discovered during the first 1.5 yr of the Pan-STARRS1 Medium Deep Survey. The Pan-STARRS1 natural photometric system is determined by a combination of on-site measurements of the instrument response function and observations of spectrophotometric standard stars. We find that the systematic uncertainties in the photometric system are currently 1.2% without accounting for the uncertainty in the Hubble Space Telescope Calspec definition of the AB system. A Hubble diagram is constructed with a subset of 113 out of 146 SNe Ia that pass our light curve quality cuts. The cosmological fit to 310 SNe Ia (113 PS1 SNe Ia + 222 light curves from 197 low-z SNe Ia), using only supernovae (SNe) and assuming a constant dark energy equation of state and flatness, yields w=-1.120+0.360-0.206(Stat) +0.269-0.291(Sys). When combined with BAO+CMB(Planck)+H 0, the analysis yields ΩM=0.280+0.013-0.012 and w=-1.166+0.072-0.069 including all identified systematics. The value of w is inconsistent with the cosmological constant value of -1 at the 2.3σ level. Tension endures after removing either the baryon acoustic oscillation (BAO) or the H0 constraint, though it is strongest when including the H 0 constraint. If we include WMAP9 cosmic microwave background (CMB) constraints instead of those from Planck, we find w=-1.124+0.083-0.065, which diminishes the discord to
Citation
Rest , A , Scolnic , D , Foley , R J , Huber , M E , Chornock , R , Narayan , G , Tonry , J L , Berger , E , Soderberg , A M , Stubbs , C W , Riess , A , Kirshner , R P , Smartt , S J , Schlafly , E , Rodney , S , Botticella , M T , Brout , D , Challis , P , Czekala , I , Drout , M , Hudson , M J , Kotak , R , Leibler , C , Lunnan , R , Marion , G H , McCrum , M , Milisavljevic , D , Pastorello , A , Sanders , N E , Smith , K , Stafford , E , Thilker , D , Valenti , S , Wood-Vasey , W M , Zheng , Z , Burgett , W S , Chambers , K C , Denneau , L , Draper , P W , Flewelling , H , Hodapp , K W , Kaiser , N , Kudritzki , R-P , Magnier , E A , Metcalfe , N , Price , P A , Sweeney , W , Wainscoat , R & Waters , C 2014 , ' Cosmological constraints from measurements of type Ia supernovae discovered during the first 1.5 yr of the Pan-STARRS1 survey ' , Astrophysical Journal , vol. 795 , no. 1 , 44 . https://doi.org/10.1088/0004-637X/795/1/44
Publication
Astrophysical Journal
Status
Peer reviewed
ISSN
0004-637XType
Journal article
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