Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science.Morales, J. C.Mustill, A. J.Ribas, I.Davies, M. B.Reiners, A.Bauer, F. F.Kossakowski, D.Herrero, E.Rodríguez, E.López González, M. J.Rodríguez López, C.Cifuentes, C.Mordasini, C.Jeffers, S. V.Rix, H. W.Ofir, A.Kürster, M.Henning, T.Emsenhuber, A.Passegger, V. M.Abellán, F. J.Rodríguez Trinidad, A.Pedraz, S.Aceituno, J.Seifert, W.Fernández Martín, A.Zechmeister, M.De Juan, E.Perryman, M. A. C.Antona, R.Alonso Floriano, F. J.Ferro, I. M.Johnson, E. N.Labiche, N.Rebolo, R.Becerril Jarque, S.Azzaro, M.Fuhrmeister, B.Lizon, J. L.Perger, M.Brinkmöller, M.Berdiñas, Z. M.Galadí Enríquez, D.López Santiago, J.Cortés Contreras, M.Calvo Ortega, R.Del Burgo, C.Gallardo Cava, I.Rosich, A.Cardona Guillén, C.Cano, J.García Vargas, M. L.Amado, P. J.Casanova, V.Carro, J.García Piquer, A.Kaminski, A.Chaturvedi, P.Gesa, L.Abril, M.Claret, A.González Álvarez, E.Ammler von Eiff, M.Czesla, S.Barrado, D.Dorda, R.González Peinado, R.Fernández Hernández, MaiteKlüter, J.Kim, M.Lara, L. M.Lampón, M.López del Fresno, M.Lodieu, N.Mancini, L.Mall, U.Martín Fernández, P.Mirabet, E.Nortmann, L.Pallé, E.Caballero, J. A.Huke, P.Huber, A.Holgado, G.Klutsch, A.Launhardt, R.López Salas, F. J.Stürmer, J.Suárez, J. C.Tabernero, H.Tulloch, S. M.Veredas, G.Vico Linares, J. I.Vilardell, F.Wagner, K.Winkler, J.Wolthoff, V.Sánchez López, A.Sánchez Blanco, E.Sadegi, S.Labarga, F.Marfil, E.Casasayas Barris, N.Bergond, G.Martín, E. L.Mandel, H.Sarkis, P.Lázaro, F. J.Luque, R.Burn, R.Marvin, E. L.Martín Ruiz, S.Sarmiento, L. F.González Cuesta, L.Anglada Escudé, G.Cárdenas, M. C.Nelson, R. P.Moya, A.Schäfer, S.Reffert, S.Casal, E.Pascual, J.Nowak, G.Schlecker, M.Quirrenbach, A.Kemmer, J.Pérez Medialdea, D.Pavlov, A.Schmitt, J. H. M. M.Lalitha, S.Rabaza, O.Pérez Calpena, A.Schöfer, P.Llamas, M.Redondo, P.Ramón Ballesta, A.Magán Madinabeitia, H.Rodler, F.Sota, A.Marín Molina, J. A.Sabotta, S.Stahl, O.Martínez Rodríguez, H.Salz, M.Stock, S.Naranjo, V.Sánchez Carrasco, M. A.Stuber, T.Sanz Forcada, J.Johansen, A.Baroch, D.Lafarga, M.Dreizler, S.Tal Or, L.Schweitzer, A.Hagen, H. J.Guenther, E. W.Montes, D.Aceituno, Francisco JoséArroyo Torres, B.Benítez, D.Kehr, M.Béjar, V. J. S.Zapatero Osorio, M. R.Yan, F.Klahr, H.Nagel, E.Trifonov, T.Guàrdia, J.Guijarro, A.De Guindos, E.Hatzes, A. P.Hauschildt, P. H.Hedrosa, R. P.Hermelo, I.Hernández Arabi, R.Hernández Otero, F.Hintz, D.Díez Alonso, E.Colomé, J.González Hernández, CarmenSolano, EnriqueUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737Centros de Excelencia Severo Ochoa, INSTITUTO DE ASTROFISICA DE ANDALUCIA (IAA), SEV-2017-07092021-04-192021-04-192019-09-27Science 365(6460): 1441-1445(2019)1095-9203https://science.sciencemag.org/content/365/6460/1441http://hdl.handle.net/20.500.12666/421Surveys have shown that super-Earth and Neptune-mass exoplanets are more frequent than gas giants around low-mass stars, as predicted by the core accretion theory of planet formation. We report the discovery of a giant planet around the very-low-mass star GJ 3512, as determined by optical and near-infrared radial-velocity observations. The planet has a minimum mass of 0.46 Jupiter masses, very high for such a small host star, and an eccentric 204-day orbit. Dynamical models show that the high eccentricity is most likely due to planet-planet interactions. We use simulations to demonstrate that the GJ 3512 planetary system challenges generally accepted formation theories, and that it puts constraints on the planet accretion and migration rates. Disk instabilities may be more efficient in forming planets than previously thought.Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of ScienceengAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttps://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/article10.1126/science.aax3198http://dx.doi.org/10.13039/501100000271http://dx.doi.org/10.13039/501100003977http://dx.doi.org/10.13039/501100001711http://dx.doi.org/10.13039/501100002946http://dx.doi.org/10.13039/501100003407http://dx.doi.org/10.13039/501100000781http://dx.doi.org/10.13039/501100002809http://dx.doi.org/10.13039/501100001659http://dx.doi.org/10.13039/501100003141http://dx.doi.org/10.13039/501100002850info:eu-repo/semantics/openAccess