{"paper":{"title":"The CARMENES search for exoplanets around M dwarfs - The enigmatic planetary system GJ 4276: One eccentric planet or two planets in a 2:1 resonance?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.EP","authors_text":"A. Kaminski, A. Quirrenbach, A. Reiners, A. Schweitzer, C. Rodr\\'iguez-L\\'opez, D. Montes, E. Nagel, E. Rodr\\'iguez, E. W. Guenther, G. Anglada-Escud\\'e, I. Ribas, J. A. Caballero, J. Aceituno, J. C. Morales, J. H. M. M. Schmitt, L. Gonz\\'alez-Cuesta, M. Cort\\'es-Contreras, M. J. L\\'opez-Gonz\\'alez, M. K\\\"urster, M. Lafarga, M. Zechmeister, P. J. Amado, S. Czesla, S. Dreizler, S. V. Jeffers, T. Henning, V. J. S. B\\'ejar, V. M. Passegger","submitted_at":"2019-01-07T16:27:02Z","abstract_excerpt":"We report the detection of a Neptune-mass exoplanet around the M4.0 dwarf GJ 4276 (G 232-070) based on radial velocity (RV) observations obtained with the CARMENES spectrograph. The RV variations of GJ 4276 are best explained by the presence of a planetary companion that has a minimum mass of $m_{\\rm b}\\sin i \\approx 16\\, M_\\oplus$ on a $P_{\\rm b}=13.35$ day orbit. The analysis of the activity indicators and spectral diagnostics exclude stellar induced RV perturbations and prove the planetary interpretation of the RV signal. We show that a circular single-planet solution can be excluded by mea"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1901.02367","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}