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A long-term multi-purpose observational programme has started withHARPS-N@TNG aimed to characterise the global architectural properties ofexoplanetary systems. In this first paper we fully characterise the transitingsystem Qatar-1. We exploit HARPS-N high-precision radial velocity measurementsobtained during a transit to measure the Rossiter-McLaughlin effect in theQatar-1 system, and out-of-transit measurements to redetermine thespectroscopic orbit. New photometric transit light-curves are analysed and aspectroscopic characterisation of the host star atmospheric parameters isperformed based on various methods (line equivalent width ratios, spectralsynthesis, spectral energy distribution). We achieved a significant improvementin the accuracy of the orbital parameters and derived the spin-orbit alignmentof the system; this information, combined with the spectroscopic determinationof the host star properties, allows us to derive the fundamental physicalparameters for star and planet (masses and radii). The orbital solution for theQatar-1 system is consistent with a circular orbit and the system presents asky-projected obliquity of lambda = -8.4+-7.1 deg. The planet, with a mass of1.33+-0.05 M_J, is found to be significantly more massive than previouslyreported. The host star is confirmed to be metal-rich ([Fe/H]= 0.20+-0.10) andslowly rotating (vsinI = 1.7+-0.3 km/s), though moderately active, as indicatedby strong chromospheric emission in the Ca II H&K line cores (logR'_HK about-4.60). The system is well aligned and fits well within the general lambda vsTeff trend. We definitely rule out any significant orbital eccentricity. Theevolutionary status of the system is inferred based on gyrochronology, and thepresent orbital configuration and timescale for orbital decay are discussed interms of star-planet tidal interactions.

The GAPS programme with HARPS-N at TNG. I: Observations of the Rossiter-McLaughlin effect and characterisation of the transiting system Qatar-1