ESO DOI Service

• Murphy, Michael T. [Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Australia; Institute for Fundamental Physics of the Universe, Trieste, Italy]
• Molaro, Paolo [Institute for Fundamental Physics of the Universe, Trieste, Italy; INAF–Astronomical Observatory of Trieste, Italy]
• Schmidt, Tobias M. [INAF–Astronomical Observatory of Trieste, Italy; Astronomical Observatory of Geneva University, Switzerland]
• Martins, Carlos J. A. P. [Institute of Astrophysics and Space Science, University of Porto, Portugal; University of Porto, Centre for Astrophysics, Portugal]
• da Fonseca, Vitor [Institute of Astrophysics and Space Science, University of Lisbon, Portugal; Department of Physics, University of Lisbon, Portugal]
• Milaković, Dinko [Institute for Fundamental Physics of the Universe, Trieste, Italy; INAF–Astronomical Observatory of Trieste, Italy; National Institute for Nuclear Physics, Trieste, Italy]
• Cupani, Guido [Institute for Fundamental Physics of the Universe, Trieste, Italy; INAF–Astronomical Observatory of Trieste, Italy]
• Cristiani, Stefano [Institute for Fundamental Physics of the Universe, Trieste, Italy; INAF–Astronomical Observatory of Trieste, Italy]
• D’Odorico, Valentina [Institute for Fundamental Physics of the Universe, Trieste, Italy; INAF–Astronomical Observatory of Trieste, Italy]
• Barreiro, Tiago [Institute of Astrophysics and Space Science, University of Lisbon, Portugal; Department of Physics, University of Lisbon, Portugal]
• Génova Santos, Ricardo [Astrophysics Institute of the Canaries, La Laguna, Tenerife, Spain; Department of Astrophysics, University of La Laguna, Tenerife, Spain]
• Leite, Ana C. O. [Institute of Astrophysics and Space Science, University of Porto, Portugal; University of Porto, Centre for Astrophysics, Portugal; Department of Physics and Astronomy, University of Porto, Portugal]
• Marques, Catarina M. J. [Institute of Astrophysics and Space Science, University of Porto, Portugal; University of Porto, Centre for Astrophysics, Portugal]
• Nunes, Nelson J. [Institute of Astrophysics and Space Science, University of Lisbon, Portugal; Department of Physics, University of Lisbon, Portugal]
• Pepe, Francesco A. [Astronomical Observatory of Geneva University, Switzerland]
• Rebolo, Rafael [Astrophysics Institute of the Canaries, La Laguna, Tenerife, Spain; Department of Astrophysics, University of La Laguna, Tenerife, Spain]
• Santos, Nuno C. [Institute of Astrophysics and Space Science, University of Porto, Portugal; Department of Physics and Astronomy, University of Porto, Portugal]
• Sousa, Sérgio G. [Institute of Astrophysics and Space Science, University of Porto, Portugal; Department of Physics and Astronomy, University of Porto, Portugal]
• Zapatero Osorio, Maria-Rosa [Centre for Astrobiology (CSIC-INTA), Madrid, Spain]
• Amate, Manuel [Astrophysics Institute of the Canaries, La Laguna, Tenerife, Spain]
• Adibekyan, Vardan [Institute of Astrophysics and Space Science, University of Porto, Portugal; Department of Physics and Astronomy, University of Porto, Portugal]
• Alibert, Yann [Physics Institute, University of Bern, Switzerland]
• Allende Prieto, Carlos [Astrophysics Institute of the Canaries, La Laguna, Tenerife, Spain; Department of Astrophysics, University of La Laguna, Tenerife, Spain]
• Baldini, Veronica [INAF–Astronomical Observatory of Trieste, Italy]
• Benz, Willy [Physics Institute, University of Bern, Switzerland]
• Bouchy, François [Astronomical Observatory of Geneva University, Switzerland]
• Cabral, Alexandre [Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Australia; Institute of Astrophysics and Space Science, University of Lisbon, Portugal]
• Dekker, Hans [European Southern Observatory (ESO)]
• Di Marcantonio, Paolo [INAF–Astronomical Observatory of Trieste, Italy]
• Ehrenreich, David [Astronomical Observatory of Geneva University, Switzerland]
• Figueira, Pedro [ESO; Institute of Astrophysics and Space Science, University of Porto, Portugal]
• González Hernández, Jonay I. [Astrophysics Institute of the Canaries, La Laguna, Tenerife, Spain; Department of Astrophysics, University of La Laguna, Tenerife, Spain]
• Landoni, Marco [INAF–Astronomical Observatory of Brera, Merate, Italy]
• Lovis, Christophe [Astronomical Observatory of Geneva University, Switzerland]
• Lo Curto, Gaspare [European Southern Observatory (ESO)]
• Manescau, Antonio [European Southern Observatory (ESO)]
• Mégevand, Denis [Astronomical Observatory of Geneva University, Switzerland]
• Mehner, Andrea [European Southern Observatory (ESO)]
• Micela, Giuseppina [INAF–Astronomical Observatory of Palermo, Italy]
• Pasquini, Luca [European Southern Observatory (ESO)]
• Poretti, Ennio [INAF–Astronomical Observatory of Brera, Merate, Italy; INAF–National Galileo Observatory, Breña Baja, Spain; INAF–Astrophysical Observatory of Turin, Italy]
• Riva, Marco [INAF–Astronomical Observatory of Brera, Merate, Italy]
• Sozzetti, Alessandro [INAF–Astrophysical Observatory of Turin, Italy]
• Suárez Mascareño, Alejandro [Astrophysics Institute of the Canaries, La Laguna, Tenerife, Spain; Department of Astrophysics, University of La Laguna, Tenerife, Spain]
• Udry, Stéphane [Institute of Astrophysics and Space Science, University of Porto, Portugal]
• Zerbi, Filippo [INAF–Astronomical Observatory of Brera, Merate, Italy]

The Echelle SPectrograph for Rocky Exoplanet and Stable Spectroscopic Observations (ESPRESSO) is the new high-resolution spectrograph of ESO’s Very Large Telescope. It was designed for ultra-high radial-velocity precision and extreme spectral fidelity with the aim of performing exoplanet research and fundamental astrophysical experiments with unprecedented precision and accuracy. The first precise ESPRESSO constraint on cosmological variations in the fine-structure constant has been obtained recently by using the laser frequency comb to provide a highly accurate wavelength scale. The target was the famous quasar HE 0515-4414, one of the brightest in the southern sky, with an intervening galaxy at z = 1.15 which imprints metal absorption lines onto the spectrum. The lack of velocity shifts between these lines is consistent with the absence of cosmological variation in the fine-structure constant at the level of about 1 part per million.