ESPRESSO Legacy Data Release: Fully Reprocessed Spectra and Radial Velocities from Archival Observations

The high-resolution spectrograph ESPRESSO, installed at the ESO Very Large Telescope in Paranal, Chile, is one of the most precise high-resolution spectrographs currently in operation. In the field of exoplanets, it plays a key role in the detection of low-amplitude exoplanets, in Rossiter–McLaughlin effect measurements, and in atmospheric transit spectroscopy.

As part of a comprehensive effort led by the Geneva Exoplanet Team with support from the DACE platform, ESPRESSO public data were retrieved from the ESO archive and fully curated. This curation includes target identification, homogenization of coordinates, proper motions, mean radial velocities, and stellar spectral types, using Gaia DR3 as a reference.

All spectra were then uniformly reprocessed using the latest version of the ESPRESSO Data Reduction Software (DRS v3.3.10), and the resulting data products are now available through the Open Data module of the DACE platform.

The ESPRESSO Legacy Data Release includes 31,659 high-resolution spectra of 815 individual targets, observed from October 2017 to September 2023. It comprises calibrated 2D echelle spectra (E2DS) and their corresponding 2D cross-correlation functions (CCFs), from which radial velocity time series are derived. Reconstructed individual 1D spectra (S1D) are also provided as part of the standard ESPRESSO-DRS output.

For a subset of targets, we further provide enhanced data products following the EPRV-Universal Data Format (Level 2), high signal-to-noise master 1D and 2D spectra generated with the ANTARESS co-addition pipeline (Bourrier et al. 2024, Astronomy and Astrophysics, 691, A113), and template-matching radial velocity time series derived using the sBART pipeline (Silva et al. 2022, Astronomy and Astrophysics, 663, A143).

This release aims to support a broad range of exoplanetary and stellar studies and to serve as a legacy resource for the astronomical research community.

The Data Analysis Center for Exoplanets (DACE) is a platform of the Swiss National Centre of Competence in Research (NCCR) PlanetS, which federates Swiss expertise in exoplanet research. It is supported by the Swiss National Science Foundation under grants 51NF40_182901 and 51NF40_205606, and is based at the Department of Astronomy of the University of Geneva, Switzerland.