The CARMENES search for exoplanets around M dwarfs - HD 147379b: A nearby Neptune in the temperate zone of an early-M dwarf
astro-ph.EP
/ Authors
A. Reiners, I. Ribas, M. Zechmeister, J. A. Caballero, T. Trifonov, S. Dreizler, J. C. Morales, L. Tal-Or, M. Lafarga, A. Quirrenbach
and 162 more authors
P. J. Amado, A. Kaminski, S. V. Jeffers, J. Aceituno, V. J. S. Béjar, J. Guàrdia, E. W. Guenther, H. -J. Hagen, D. Montes, V. M. Passegger, W. Seifert, A. Schweitzer, M. Cortés-Contreras, M. Abril, F. J. Alonso-Floriano, M. Ammler-von Eiff, R. Antona, G. Anglada-Escudé, H. Anwand-Heerwart, B. Arroyo-Torres, M. Azzaro, D. Baroch, D. Barrado
/ Abstract
We report on the first star discovered to host a planet detected by radial velocity (RV) observations obtained within the CARMENES survey for exoplanets around M dwarfs. HD 147379 ($V = 8.9$ mag, $M = 0.58 \pm 0.08$ M$_{\odot}$), a bright M0.0V star at a distance of 10.7 pc, is found to undergo periodic RV variations 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 were taken between 2016 and 2017, and is supported by HIRES/Keck observations that were obtained since 2000. The RV variations are interpreted as resulting from a planet of minimum mass $m_{\rm p}\sin{i} = 25 \pm 2$ M$_{\oplus}$, 1.5 times the mass of Neptune, with an orbital semi-major axis $a = 0.32$ au and low eccentricity ($e < 0.13$). HD 147379b is orbiting inside the temperate zone around the star, where water could exist in liquid form. The RV time-series and various spectroscopic indicators show additional hints of variations at an approximate period of 21.1d (and its first harmonic), which we attribute to the rotation period of the star.