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HD3167 is a bright (V=8.9 mag) K0V star observed by the NASA's K2 spacemission during its Campaign 8. It has been recently found to host two smalltransiting planets, namely, HD3167b, an ultra short period (0.96 d)super-Earth, and HD3167c, a mini-Neptune on a relatively long-period orbit(29.85 d). Here we present an intensive radial velocity follow-up of HD3167performed with the FIES@NOT, HARPS@ESO-3.6m, and HARPS-N@TNG spectrographs. Werevise the system parameters and determine radii, masses, and densities of thetwo transiting planets by combining the K2 photometry with our spectroscopicdata. With a mass of 5.69+/-0.44 MEarth, radius of 1.574+/-0.054 REarth, andmean density of 8.00(+1.0)(-0.98) g/cm^3, HD3167b joins the small group ofultra-short period planets known to have a rocky terrestrial composition.HD3167c has a mass of 8.33 (+1.79)(-1.85) MEarth and a radius of2.740(+0.106)(-0.100) REarth, yielding a mean density of 2.21(+0.56)(-0.53)g/cm^3, indicative of a planet with a composition comprising a solid coresurrounded by a thick atmospheric envelope. The rather large pressure scaleheight (about 350 km) and the brightness of the host star make HD3167c an idealtarget for atmospheric characterization via transmission spectroscopy across abroad range of wavelengths. We found evidence of additional signals in theradial velocity measurements but the currently available data set does notallow us to draw any firm conclusion on the origin of the observed variation.

The transiting multi-planet system HD3167: a 5.7 MEarth Super-Earth and a 8.3 MEarth mini-Neptune