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Since the first discovery of a planet outside of our Solar System in 1995,exoplanet research has shifted from detecting to characterizing worlds aroundother stars. The TESS (NASA, launched 2019) and PLATO mission (ESA, plannedlaunch 2026) will find and constrain the size of thousands of exoplanets aroundbright stars all over the sky. Radial velocity measurements are needed tocharacterize the orbit and mass, and complete the picture of densities andcomposition of the exoplanet systems found. The Ariel mission (ESA, plannedlaunch 2028) will characterize exoplanet atmospheres with infraredspectroscopy. Characterization of stellar activity using optical spectroscopyfrom the ground is key to retrieve the spectral footprint of the planetaryatmosphere in Ariel's spectra. To enable the scientific harvest of the TESS,PLATO and Ariel space missions, we plan to install MARVEL as an extension ofthe existing Mercator Telescope at the Roque De Los Muchachos Observatory on LaPalma (SPAIN). MARVEL consists of an array of four 80 cm telescopes linkedthrough optical fibers to a single high-resolution echelle spectrograph,optimized for extreme-precision radial velocity measurements. It can observethe radial velocities of four different stars simultaneously or, alternatively,combine the flux from four telescopes pointing to a single faint target in onespectrum. MARVEL is constructed by a KU Leuven (Belgium) led collaboration,with contributions from the UK, Austria, Australia, Sweden, Denmark and Spain.In this paper, we present the MARVEL instrument with special focus on theoptical design and expected performance of the spectrograph, and report on thestatus of the project.

MARVEL, a four-telescope array for high-precision radial-velocity monitoring