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The CARMENES search for exoplanets around M dwarfs: HD147379 b: A nearby Neptune in the temperate zone of an early-M dwarf

AuthorsReiners, A.; Ribas, I.; Zechmeister, M.; Caballero, J.A.; Trifonov, T.; Dreizler, S.; Morales, J.C.; Tal-Or, L.; Lafarga, M.; Quirrenbach, A.; Benítez, D.; Ferro, I.M.; Galadí-Enríquez, D.; Garcia-Piquer, A.; Gesa, L.; López-Puertas, M.; Gómez Galera, V.; González Hernández, J.I.; González-Peinado, R.; Guijarro, A.; Helmling, J.; Gutiérrez-Soto, J. ; Fernández, M. ; De Guindos, E.; Martín-Ruiz, S.; Hedrosa, R.P.; Hermelo, I.; Amado, Pedro J. ; Hernández Arabí, R.; Hernández Castaño, L.; Hernández Hernando, F.; Herrero, E.; De Juan, E.; Klutsch, A.; López Del Fresno, M.; Labarga, F.; Lampón, M.; López-González, M. J.; López Salas, J.F.; López-Santiago, J.; Magán Madinabeitia, H.; Marfil, E.; Marín Molina, J.A.; Maroto Fernández, D.; Martín, E.L.; Mirabet, E.; Nortmann, L.; Nowak, G.; Moreno-Raya, M.E.; Moya, A.; Oreiro, R.; Pallé, E.; Pascual, J.; Pedraz, S.; Pérez Medialdea, D.; Perger, M.; Rabaza, O.; Ramón, A.; Rebolo, R.; Rodríguez Martínez, Eloy ; Redondo, P.; Reinhart, S.; Claret, A.; Rodríguez Trinidad, A.; Rosich, A.; Sánchez-Blanco, E.; Sánchez Carrasco, M.A.; Sánchez-López, A.; Sanz-Forcada, J.; Solano, E.; Suárez, J.C.; Tabernero, H.M.; Vico Linares, J.I.; Kaminski, A.; Cárdenas Vázquez, M.C.; Vilardell, F.; Zapatero Osorio, M.R.; Jeffers, S.V.; Aceituno, J.; Béjar, V.J.S.; Guàrdia, J.; Guenther, E.W.; Hagen, H.J.; Montes, D.; Passegger, V.M.; Abril, Miguel ; Seifert, W.; Schweitzer, A.; Cortés-Contreras, M.; Alonso-Floriano, F.J.; Eiff, M.A.V.; Antona, R.; Anglada-Escudé, G.; Anwand-Heerwart, H.; Rodríguez-López, Cristina ; Arroyo-Torres, B.; Azzaro, M.; Baroch, D.; Barrado, D.; Berdiñas, Z. M.; Bauer, F.F.; Becerril, S.; Bergond, G.; Blümcke, M.; Brinkmöller, M.; Del Burgo, C.; Cano, J.; Casal, E.; Cifuentes, C.; Díez-Alonso, E.; Lara, L.M.; Colomé, J.; Czesla, S.
KeywordsPlanets and satellites: individual: HD 147379 b
Stars: activity
Stars: individual: HD 147379
Stars: late-type
Stars: low-mass
Stars: rotation
Issue Date2018
PublisherEDP Sciences
CitationAstronomy and Astrophysics 609: L5 (2018)
AbstractWe 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), 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 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 sin i = 25 ± 2 M, 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.© ESO, 2018.
DescriptionRV data (Table A.1) are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr ( or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/609/L5
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201732165
Identifiersdoi: 10.1051/0004-6361/201732165
issn: 1432-0746
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