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The search for telluric extrasolar planets with the Radial Velocity (RV)technique is intrinsically limited by the stellar jitter due to the activity ofthe star, because stellar surface inhomogeneities, including spots, plages andconvective granules, induce perturbations hiding or even mimicking theplanetary signal. This kind of noise is poorly understood in all the stars, butthe Sun, due to their unresolved surfaces. For these reasons, the effects ofthe surface inhomogeneities on the measurement of the RV are very difficult tocharacterize. On the other hand, a better knowledge of these phenomena canallow us a step forward in our understanding of solar and stellar RV noisesources. This will allow to develop more tools for an optimal activitycorrection leading to more precise stellar RVs. Due to the high spatialresolution with which the Sun is observed, this noise is well known for it.Despite this, a link is lacking between the single observed photosphericphenomena and the behavior of the Sun observed as a star. LOCNES (Low Cost NIRExtended Solar Telescope) will allow to gather time series of RVs in order todisentangle the different contributions to the stellar (i.e., solar) RV jitter.Since July 2015, a Low Cost Solar Telescope (LCST) has been installed outsidethe TNG dome to feed solar light to the HARPS-N spectrograph (0.38-0.69 $\mu$m;R=115000). The refurbishment of the Near Infrared (NIR) High ResolutionSpectrograph GIANO (now GIANO-B) and the new observing mode GIARPS at TNG(simultaneous observations in visible with HARPS-N and in NIR with GIANO-B) isa unique opportunity to extend the wavelength range up to 2.4 $\mu$m formeasuring the RV time series of the Sun as a star. This paper outlines theLOCNES project and its scientific drivers.

LOCNES: Low Cost NIR Extended Solar Telescope