12:00–1:00 pm ERC 401
Maria Vincenzi (Duke) "Present and future of SN Ia cosmology: from the Dark Energy Survey to the Vera Rubin Observatory"
This is a very exciting time for cosmology with type Ia supernovae (SNe Ia). The recently concluded Dark Energy Survey SN program (DES-SN) has obtained the largest and deepest high-redshift cosmological SN Ia sample to date, and the Vera Rubin Observatory is expected to observe at least two orders of magnitude more SNe Ia in the next decade. In my talk, I will give an overview of the current status of the cosmological analysis of the DES-SN sample. I will present the set of simulations generated to accurately and robustly model the DES-SN survey, and I’ll show how these simulations can be used to assess different sources of systematic uncertainties, in particular “contamination” from non-Ia SN events. I will then present the preliminary (blinded) constraints on the dark energy equation of state, w, from the DES-SN sample. We expect the DES-SN sample to provide the tightest SN Ia constraints on w in the pre-Rubin era. Looking towards the future, I will discuss how the DES-SN survey can inform and contribute to the design of SN surveys conducted by the Rubin Observatory, and I’ll show the latest forecasts on cosmological constraints from the Rubin SN Ia sample.