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We report on the first star discovered to host a planet detected by radialvelocity (RV) observations obtained within the CARMENES survey for exoplanetsaround M dwarfs. HD 147379 ($V = 8.9$ mag, $M = 0.58 \pm 0.08$ M$_{\odot}$), abright M0.0V star at a distance of 10.7 pc, is found to undergo periodic RVvariations with a semi-amplitude of $K = 5.1\pm0.4$ m s$^{-1}$ and a period of$P = 86.54\pm0.06$ d. The RV signal is found in our CARMENES data, which weretaken between 2016 and 2017, and is supported by HIRES/Keck observations thatwere obtained since 2000. The RV variations are interpreted as resulting from aplanet of minimum mass $m_{\rm p}\sin{i} = 25 \pm 2$ M$_{\oplus}$, 1.5 timesthe mass of Neptune, with an orbital semi-major axis $a = 0.32$ au and loweccentricity ($e < 0.13$). HD 147379b is orbiting inside the temperate zonearound the star, where water could exist in liquid form. The RV time-series andvarious spectroscopic indicators show additional hints of variations at anapproximate period of 21.1d (and its first harmonic), which we attribute to therotation period of the star.

The CARMENES search for exoplanets around M dwarfs - HD 147379b: A nearby Neptune in the temperate zone of an early-M dwarf