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COSMOLOGICAL CONSTRAINTS FROM MEASUREMENTS OF TYPE Ia SUPERNOVAE DISCOVERED DURING THE FIRST 1.5 yr OF THE Pan-STARRS1 SURVEY
Tekijät: Rest A, Scolnic D, Foley RJ, Huber ME, Chornock R, Narayan G, Tonry JL, Berger E, Soderberg AM, Stubbs CW, Riess A, Kirshner RP, Smartt SJ, Schlafly E, Rodney S, Botticella MT, Brout D, Challis P, Czekala I, Drout M, Hudson MJ, Kotak R, Leibler C, Lunnan R, Marion GH, McCrum M, Milisavljevic D, Pastorello A, Sanders NE, Smith K, Stafford E, Thilker D, Valenti S, Wood-Vasey WM, Zheng Z, Burgett WS, Chambers KC, Denneau L, Draper PW, Flewelling H, Hodapp KW, Kaiser N, Kudritzki RP, Magnier EA, Metcalfe N, Price PA, Sweeney W, Wainscoat R, Waters C, Waters C
Kustantaja: IOP PUBLISHING LTD
Julkaisuvuosi: 2014
Journal: Astrophysical Journal
Tietokannassa oleva lehden nimi: ASTROPHYSICAL JOURNAL
Lehden akronyymi: ASTROPHYS J
Artikkelin numero: ARTN 44
Vuosikerta: 795
Numero: 1
Sivujen määrä: 34
ISSN: 0004-637X
DOI: https://doi.org/10.1088/0004-637X/795/1/44
We present griz(P1) 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 Omega(M) = 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 2.3 sigma level. Tension endures after removing either the baryon acoustic oscillation (BAO) or the H-0 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 <2 sigma. We cannot conclude whether the tension with flat ACDM is a feature of dark energy, new physics, or a combination of chance and systematic errors. The full Pan-STARRS1 SN sample with similar to three times as many SNe should provide more conclusive results.
