Cosmological Parameter Constraints from the Dark Energy Survey Supernova Program Three Year Spectroscopic Sample

  • Feb. 2, 2018, 4:00 pm
  • Dillon Brout, U Penn

Type Ia Supernovae remain a crucial probe in the race to measure properties of Dark Energy as they trace a wide range of the expansion history of the universe and provide complementary constraints on cosmological parameters to those of the cosmic microwave background, weak lensing, baryon acoustic oscillations, and galaxy clustering. The Dark Energy Survey Supernova Program (DESSN) has positioned itself to make a leap forward in the measurement of the equation of state parameter for dark energy prior to the next generation of large scale supernova surveys of LSST and WFIRST, and thus it will be a vital tool in realizing the true potential of these future surveys. I will discuss the recent cosmological parameter constraints from 251 spectroscopically identified Type Ia Supernovae (SNeIa) from the first three years of DESSN and 175 spectroscopically identified SNeIa from an external low redshift sample. We will look ahead to the future plans for the analysis of the full 5 year photometrically identified dataset (~2000 SNeIa) and implications for leading theories of dark energy.