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, EnriqueRodríguez, E.López González, M. J.Rodríguez López, C.Stock, S.Zechmeister, M.Luque, R.Gesa, L.Pedraz, S.Baroch, D.Sarkis, P.Lafarga, M.Johnson, E. N.Anglada Escudé, G.González Álvarez, E.Perryman, M. A. C.Dreizler, S.Sarmiento, L. F.Tal Or, L.Labarga, F.Reffert, S.Rebolo, R.Schweitzer, A.Schäfer, S.Hagen, H. J.Lázaro, F. J.Quirrenbach, A.Perger, M.Guenther, E. W.Schlecker, M.Montes, D.Jeffers, S. V.Cortés Contreras, M.Kürster, M.Schmitt, J. H. M. M.Aceituno, Francisco JoséAbellán, F. J.Rosich, A.Aceituno, J.Schöfer, P.Arroyo Torres, B.Amado, P. J.Antona, R.Solano, E.Benítez, D.Kaminski, A.Becerril Jarque, S.Sota, A.Kehr, M.Abril, M.Brinkmöller, M.Béjar, V. J. S.Ammler von Eiff, M.Calvo Ortega, R.Zapatero Osorio, M. R.Barrado, D.Cardona Guillén, C.Yan, F.Bergond, G.Casanova, V.Klahr, H.Chaturvedi, P.Nagel, E.Claret, A.Trifonov, T.Czesla, S.Henning, T.Dorda, R.Seifert, W.Fernández Hernández, MaiteAlonso Floriano, F. J.Azzaro, M.Berdiñas, Z. M.Del Burgo, C.Cano, J.Carro, J.Casasayas Barris, N.Cifuentes, C.Colomé, J.Díez Alonso, E.Emsenhuber, A.Guàrdia, J.Guijarro, A.De Guindos, E.Hatzes, ArtieHauschildt, P. H.Hedrosa, R. P.Hermelo, I.Hernández Arabi, R.Hernández Otero, F.Hintz, D.Klüter, J.González Peinado, R.González Hernández, J. I.González Cuesta, L.De Juan, E.Stahl, O.Burn, R.Kim, M.Fernández Martín, A.Lara, L. M.Mordasini, C.Labiche, N.Cárdenas, M. C.Lampón, M.Ferro, I. M.López del Fresno, M.Passegger, V. M.Lizon, Jean LouisCasal, E.Lodieu, N.Fuhrmeister, B.Mancini, L.López Santiago, J.Kemmer, J.Mall, U.Galadí Enríquez, D.Martín Fernández, P.Marfil, E.Lalitha, S.Martín, Eduardo L.Gallardo Cava, I.Mirabet, E.Llamas, M.Marvin, E. L.García Vargas, M. L.Nortmann, L.Magán Madinabeitia, H.Nelson, RichardGarcía Piquer, A.Pallé, E.Marín Molina, J. A.Pascual Granado, J.Caballero, J. A.Martínez Rodríguez, H.Pérez Medialdea, D.Huke, P.Naranjo, V.Rabaza, O.Huber, A.Ofir, A.Redondo, P.Holgado, G.Rodler, F.Klutsch, A.Sabotta, S.Launhardt, R.Salz, M.López Salas, F. J.Sánchez Carrasco, M. A.Mandel, H.Sanz Forcada, J.Martín Ruiz, S.Moya, A.Nowak, G.Pavlov, AlexanderPérez Calpena, A.Ramón Ballesta, A.Rix, H. W.Rodríguez Trinidad, A.Sadegi, S.Sánchez Blanco, E.Sánchez López, A.Stürmer, J.Suárez, J. C.Tabernero, H. M.Tulloch, S. M.Veredas, G.Vico Linares, J. I.Vilardell, F.Wagner, K.Winkler, J.Wolthoff, V.Johansen, A.Stuber, T.Solano, EnriqueGonzález Hernández, CarmenUnidad 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://www.science.org/doi/10.1126/science.aax3198http://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