First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey (DES-SN3YR)

(21 February 2019)

This is the first public data release of the Dark Energy Survey Supernova Program, DES-SN3YR, consisting of data products used to compute the cosmological result from the first 3 years of spectroscopically classified supernovae (SNe) combined with a sample of low-redshift SNe. We provide filter transmissions, photometry and SN+Host metadata, spectroscopic observations and classifications, simulations used for bias corrections, bias corrected distances, measurement uncertainties, full systematic covariance matrix, and CosmoMC inputs & chains. DES-SN3YR is based on a set of 207 Type Ia SNe from DES and 122 SNe Ia from external Low-z SN Ia samples.


The Cerro Tololo Inter-American Observatory (CTIO) is a complex of astronomical telescopes and instruments located at 30.169 S, 70.804 W, approximately 80 km to the East of La Serena, Chile, at an altitude of 2200 meters.  CTIO headquarters are located in La Serena, Chile, about 300 miles north of Santiago.

The CTIO complex is part of the U.S. National Optical Astronomy Observatory (NOAO), along with the Kitt Peak National Observatory (KPNO) in Tucson, Arizona.  NOAO is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation (NSF).  CTIO, as part of the AURA Observatory in Chile, operates in Chile under Chilean law, through an Agreement with the University of Chile and with the auspices of the Ministry of Foreign Affairs of Chile.

The principal telescopes on site are the 4-m Victor M. Blanco Telescope and the 4.1-m Southern Astrophysical Research (SOAR) telescope.  One of the two 8-m telescopes comprising the Gemini Observatory is co-located with CTIO on AURA property in Chile, together with more than 10 other telescopes and astronomical projects.