Dreizler, S.S.DreizlerLuque, R.R.LuqueRibas, I.I.RibasKoseleva, V.V.KoselevaRuh, H. L.H. L.RuhNagel, E.E.NagelPozuelos, F. J.F. J.PozuelosZechmeister, M.M.ZechmeisterReiners, A.A.ReinersCaballero, J. A.J. A.CaballeroLinares, J. I. VicoJ. I. VicoLinares2024-07-062024-07-062024https://resolver.sub.uni-goettingen.de/purl?gro-2/144024The two known planets in the planetary system of Teegarden’s Star are among the most Earth-like exoplanets currently known. Revisiting this nearby planetary system with two planets in the habitable zone aims at a more complete census of planets around very low-mass stars. A significant number of new radial velocity measurements from CARMENES, ESPRESSO, MAROON-X, and HPF, as well as photometry from TESS motivated a deeper search for additional planets. We confirm and refine the orbital parameters of the two know planets Teegarden’s Star b and c. We also report the detection of a third planet d with an orbital period of 26.13 ± 0.04 days and a minimum mass of 0.82 ± 0.17 M ⊕ . A signal at 96 days is attributed to the stellar rotation period. The interpretation of a signal at 172 days remains open. The TESS data exclude transiting short-period planets down to about half an Earth radius. We compare the planetary system architecture of very low-mass stars. In the currently known configuration, the planetary system of Teegarden’s star is dynamically quite different from that of TRAPPIST-1, which is more compact, but dynamically similar to others such as GJ 1002.journal_article10.1051/0004-6361/202348033aa48033-23