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We aim at the discovery of new planetary systems by exploiting the transitlight curve results from TESS orbital observatory's Sector 1 and 2 observationsand validating them with precise Doppler measurements obtained from archivalHARPS data. Taking advantage of the reported TESS transit events around GJ143(TOI 186) and HD23472 (TOI 174) we model their HARPS precise Dopplermeasurements and derive orbital parameters for these two systems. For the GJ143system TESS has reported only a single transit, and thus its period isunconstrained from photometry. Our RV analysis of GJ143 reveal the fullKeplerian solution of the system, which is consistent with an eccentric planetwith a mass almost twice that of Neptune and a period of $P_{\rm b}$ =$35.59_{-0.01}^{+0.01}$ days. Our estimates of the GJ143 b planet are fullyconsistent with the transit timing from TESS. We confirm the two-planet systemaround HD23472, which according to our analysis is composed of two Neptune massplanets in a possible 5:3 MMR.

TESS exoplanet candidates validated with HARPS archival data. A massive Neptune around GJ143 and two Neptunes around HD23472