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We present optical light curves, redshifts, and classifications for 365spectroscopically confirmed Type Ia supernovae (SNe Ia) discovered by thePan-STARRS1 (PS1) Medium Deep Survey. We detail improvements to the PS1 SNphotometry, astrometry and calibration that reduce the systematic uncertaintiesin the PS1 SN Ia distances. We combine the subset of 279 PS1 SN Ia ($0.03 < z <0.68$) with useful distance estimates of SN Ia from SDSS, SNLS, various low-zand HST samples to form the largest combined sample of SN Ia consisting of atotal of 1048 SN Ia ranging from $0.01 < z < 2.3$, which we call the `PantheonSample'. When combining Planck 2015 CMB measurements with the Pantheon SNsample, we find $\Omega_m=0.307\pm0.012$ and $w = -1.026\pm0.041$ for the wCDMmodel. When the SN and CMB constraints are combined with constraints from BAOand local H0 measurements, the analysis yields the most precise measurement ofdark energy to date: $w0 = -1.007\pm 0.089$ and $wa = -0.222 \pm0.407$ for thew0waCDM model. Tension with a cosmological constant previously seen in ananalysis of PS1 and low-z SNe has diminished after an increase of $2\times$ inthe statistics of the PS1 sample, improved calibration and photometry, andstricter light-curve quality cuts. We find the systematic uncertainties in ourmeasurements of dark energy are almost as large as the statisticaluncertainties, primarily due to limitations of modeling the low-redshiftsample. This must be addressed for future progress in using SN Ia to measuredark energy.

astrophysical journal/the astrophysical journal

The Complete Light-curve Sample of Spectroscopically Confirmed Type Ia  Supernovae from Pan-STARRS1 and Cosmological Constraints from The Combined  Pantheon Sample