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

DOI: 
10.1051/0004-6361/201732165
Publication date: 
01/02/2018
Main author: 
Reiners, A.
IAA authors: 
Amado, P. J.;Abril, M.;Antona, R.;Becerril, S.;Berdiñas, Z. M.;Cárdenas Vázquez, M. C.;Casal, E.;Claret, A.;Fernández, M.;Ferro, I. M.;Gutiérrez-Soto, J.;Lampón, M.;Lara, L. M.;López-González, M. J.;López-Puertas, M.;Martín-Ruiz, S.;Mirabet, E.;Oreiro, R.;Pascual, J.;Pérez Medialdea, D.;Rabaza, O.;Ramón, A.;Rodríguez, E.;Rodríguez-López, C.;Rodríguez Trinidad, A.;Sánchez-Blanco, E.;Sánchez Carrasco, M. A.;Sánchez-López, A.;Suárez, J. C.
Authors: 
Reiners, A.;Ribas, I.;Zechmeister, M.;Caballero, J. A.;Trifonov, T.;Dreizler, S.;Morales, J. C.;Tal-Or, L.;Lafarga, M.;Quirrenbach, A.;Amado, P. J.;Kaminski, A.;Jeffers, S. V.;Aceituno, J.;Béjar, V. J. S.;Guàrdia, J.;Guenther, E. W.;Hagen, H. -J.;Montes, D.;Passegger, V. M.;Seifert, W.;Schweitzer, A.;Cortés-Contreras, M.;Abril, M.;Alonso-Floriano, F. J.;Eiff, M. Ammler-von;Antona, R.;Anglada-Escudé, G.;Anwand-Heerwart, H.;Arroyo-Torres, B.;Azzaro, M.;Baroch, D.;Barrado, D.;Bauer, F. F.;Becerril, S.;Benítez, D.;Berdiñas, Z. M.;Bergond, G.;Blümcke, M.;Brinkmöller, M.;del Burgo, C.;Cano, J.;Cárdenas Vázquez, M. C.;Casal, E.;Cifuentes, C.;Claret, A.;Colomé, J.;Czesla, S.;Díez-Alonso, E.;Feiz, C.;Fernández, M.;Ferro, I. M.;Fuhrmeister, B.;Galadí-Enríquez, D.;Garcia-Piquer, A.;García Vargas, M. L.;Gesa, L.;Gómez Galera, V.;González Hernández, J. I.;González-Peinado, R.;Grözinger, U.;Grohnert, S.;Guijarro, A.;de Guindos, E.;Gutiérrez-Soto, J.;Hatzes, A. P.;Hauschildt, P. H.;Hedrosa, R. P.;Helmling, J.;Henning, Th.;Hermelo, I.;Hernández Arabí, R.;Hernández Castaño, L.;Hernández Hernando, F.;Herrero, E.;Huber, A.;Huke, P.;Johnson, E. N.;de Juan, E.;Kim, M.;Klein, R.;Klüter, J.;Klutsch, A.;Kürster, M.;Labarga, F.;Lamert, A.;Lampón, M.;Lara, L. M.;Laun, W.;Lemke, U.;Lenzen, R.;Launhardt, R.;López del Fresno, M.;López-González, M. J.;López-Puertas, M.;López Salas, J. F.;López-Santiago, J.;Luque, R.;Magán Madinabeitia, H.;Mall, U.;Mancini, L.;Mandel, H.;Marfil, E.;Marín Molina, J. A.;Maroto Fernández, D.;Martín, E. L.;Martín-Ruiz, S.;Marvin, C. J.;Mathar, R. J.;Mirabet, E.;Moreno-Raya, M. E.;Moya, A.;Mundt, R.;Nagel, E.;Naranjo, V.;Nortmann, L.;Nowak, G.;Ofir, A.;Oreiro, R.;Pallé, E.;Panduro, J.;Pascual, J.;Pavlov, A.;Pedraz, S.;Pérez-Calpena, A.;Pérez Medialdea, D.;Perger, M.;Perryman, M. A. C.;Pluto, M.;Rabaza, O.;Ramón, A.;Rebolo, R.;Redondo, P.;Reffert, S.;Reinhart, S.;Rhode, P.;Rix, H. -W.;Rodler, F.;Rodríguez, E.;Rodríguez-López, C.;Rodríguez Trinidad, A.;Rohloff, R. -R.;Rosich, A.;Sadegi, S.;Sánchez-Blanco, E.;Sánchez Carrasco, M. A.;Sánchez-López, A.;Sanz-Forcada, J.;Sarkis, P.;Sarmiento, L. F.;Schäfer, S.;Schmitt, J. H. M. M.;Schiller, J.;Schöfer, P.;Solano, E.;Stahl, O.;Strachan, J. B. P.;Stürmer, J.;Suárez, J. C.;Tabernero, H. M.;Tala, M.;Tulloch, S. M.;Ulbrich, R. -G.;Veredas, G.;Vico Linares, J. I.;Vilardell, F.;Wagner, K.;Winkler, J.;Wolthoff, V.;Xu, W.;Yan, F.;Zapatero Osorio, M. R.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
609
Pages: 
L5
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 ± 0.08 M<SUB>☉</SUB>), 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<SUP>-1</SUP> 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<SUB>P</SUB> sin i = 25 ± 2 M<SUB>⊕</SUB>, 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. RV data (Table A.1) are only available at the CDS via anonymous ftp to <A href='http://cdsarc.u-strasbg.fr'>http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href='http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/609/L5'>http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/609/L5</A>
Database: 
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2018A&A...609L...5R/abstract
ADS Bibcode: 
2018A&A...609L...5R
Keywords: 
stars: individual: HD 147379;planets and satellites: individual: HD 147379 b;stars: activity;stars: rotation;stars: late-type;stars: low-mass;Astrophysics - Earth and Planetary Astrophysics;Astrophysics - Solar and Stellar Astrophysics