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The Echelle Spectrograph for Rocky Exoplanet- and Stable Spectroscopic Observations, or ESPRESSO for short, is a high-resolution spectrograph installed at the Very Large Telescope in Chile, operated by the European Southern Observatory ESO.
To learn more, visit ESPRESSO’s instrument page or ESPRESSO’s science operation page by ESO.
For in-depth info about the instrument and its performance, see also the following paper: Pepe et al. (2020), also available on arXiv.
Photo taken in 2017 of ESPRESSO during laboratory testing at the University of Geneva prior to installation at the VLT in Chile. Credit: University of Geneva via ESO.