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oai:docta.ucm.es:20.500.14352/120962023-08-26T10:44:17Zcom_20.500.14352_14col_20.500.14352_15

Montes Gutiérrez, David Cortés Contreras, Miriam otros, ... 2023-06-17T12:27:18Z 2023-06-17T12:27:18Z 2018-02-08 1432-0746 10.1051/0004-6361/201732165 https://hdl.handle.net/20.500.14352/12096 http://dx.doi.org/10.1051/0004-6361/201732165 https://www.aanda.org/ 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 +/- 0.08 M-circle dot), a bright M0.0 V star at a distance of 10.7 pc, is found to undergo periodic RV variations with a semi-amplitude of K = 5.1 +/- 0.4 m s(-1) and a period of P = 86.54 +/- 0.06 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(P) sin i = 25 +/- 2 M-circle plus, 1.5 times the mass of Neptune, with an orbital semi-major axis a = 0.32 au and low eccentricity (e < 0.13). HD 147379 b 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 21.1 d (and its first harmonic), which we attribute to the rotation period of the star. eng open access The CARMENES search for exoplanets around M dwarfs HD147379 b: A nearby Neptune in the temperate zone of an early-M dwarf journal article