The acceleration of the Universe in the light of supernovae -- The key role of the Cerro Tololo Inter-American Observatory

TL;DR

This paper reviews how Cerro Tololo Inter-American Observatory's supernova surveys and instruments contributed crucially to the discovery of the universe's acceleration and dark energy, marking a major breakthrough in astrophysics.

Contribution

It highlights CTIO's instrumental and survey efforts that were pivotal in the discovery of cosmic acceleration and dark energy, providing historical context.

Findings

CTIO's supernova surveys led to the discovery of acceleration.

State-of-the-art instruments at CTIO were fundamental.

The work contributed to the understanding of dark energy.

Abstract

The discovery of acceleration and dark energy arguably constitutes the most revolutionary discovery in astrophysics in recent years. Cerro Tololo Inter-American Observatory (CTIO) played a key role in this amazing discovery through three systematic supernova surveys organized by staff astronomers: the "Tololo Supernova Program" (1986-2000), the Calan/Tololo Project (1989-1993), and the "High-Z Supernova Search Team" (1994-1998). CTIO's state of the art instruments also were fundamental in the independent discovery of acceleration by the "Supernova Cosmology Project" (1992-1999). Here I summarize the work on supernovae carried out from CTIO that led to the discovery of acceleration and dark energy and provide a brief historical summary on the use of Type Ia supernovae in cosmology in order to provide context for the CTIO contribution.