Kemmer, J.Stock, S.Kossakowski, D.Kaminski, A.Molaverdikhani, K.Schlecker, M.Caballero, J.A.Amado, P.J.Astudillo-Defru, NicolaBonfils, XavierCiardi, David R.Collins, K.A.Espinoza, N.Fukui, A.Hirano, T.Jenkins, J.M.Latham, D.W.Matthews, E.C.Narita, N.Pallé, E.Parviainen, H.Quirrenbach, A.Reiners, A.Ribas, I.Ricker, G.Schlieder, J.E.Seager, S.Vanderspek, R.Winn, J.N.Almenara, J.M.Béjar, V.J.S.Bluhm, P.Bouchy, FrançoisBoyd, Patricia T.Christiansen, J.L.Cifuentes, C.Cloutier, RyanCollins, K.I.Cortés-Contreras, M.Crossfield, Ian J.M.Crouzet, Nicolasde Leon, J.P.Della-Rose, D.D.Delfosse, XavierDreizler, S.Esparza-Borges, E.Essack, ZahraForveille, ThierryFigueira, PedroGaladí-Enríquez, D.Gan, TianjunGlidden, A.Gonzales, E.J.Guerra, P.Harakawa, H.Hatzes, A.P.Henning, Th.Herrero, E.Hodapp, K.Hori, Y.Howell, S.B.Ikoma, M.Isogai, K.Jeffers, S.V.Kürster, M.Kawauchi, K.Kimura, T.Klagyivik, P.Kotani, T.Kurokawa, T.Kusakabe, N.Kuzuhara, M.Lafarga, M.Livingston, J.H.Luque, R.Matson, R.Morales, J.C.Mori, M.Muirhead, Philip S.Murgas, F.Nishikawa, J.Nishiumi, T.Omiya, M.Reffert, S.Rodríguez López, C.Santos, N.C.Schöfer, P.Schwarz, R.P.Shiao, B.Tamura, M.Terada, Y.Twicken, J.D.Ueda, A.Vievard, S.Watanabe, N.Zechmeister, M.2021-03-092021-03-092020-10J. Kemmer, S. Stock, D. Kossakowski, A. Kaminski, K. Molaverdikhani, M. Schlecker, J.A. Caballero, P.J. Amado, N. Astudillo-Defru, X. Bonfils, D. Ciardi, K.A. Collins, N. Espinoza, A. Fukui, T. Hirano, J.M. Jenkins, D.W. Latham, E.C. Matthews, N. Narita, E. Pallé, H. Parviainen, A. Quirrenbach, A. Reiners, I. Ribas, G. Ricker, J.E. Schlieder, S. Seager, R. Vanderspek, J.N. Winn, J.M. Almenara, V.J.S. Béjar, P. Bluhm, F. Bouchy, P. Boyd, J.L. Christiansen, C. Cifuentes, R. Cloutier, K.I. Collins, M. Cortés-Contreras, I.J.M. Crossfield, N. Crouzet, J.P. de Leon, D.D. Della-Rose, X. Delfosse, S. Dreizler, E. Esparza-Borges, Z. Essack, Th Forveille, P. Figueira, D. Galadí-Enríquez, T. Gan, A. Glidden, E.J. Gonzales, P. Guerra, H. Harakawa, A.P. Hatzes, Th Henning, E. Herrero, K. Hodapp, Y. Hori, S.B. Howell, M. Ikoma, K. Isogai, S.V. Jeffers, M. Kürster, K. Kawauchi, T. Kimura, P. Klagyivik, T. Kotani, T. Kurokawa, N. Kusakabe, M. Kuzuhara, M. Lafarga, J.H. Livingston, R. Luque, R. Matson, J.C. Morales, M. Mori, P.S. Muirhead, F. Murgas, J. Nishikawa, T. Nishiumi, M. Omiya, S. Reffert, C. Rodríguez López, N.C. Santos, P. Schöfer, R.P. Schwarz, B. Shiao, M. Tamura, Y. Terada, J.D. Twicken, A. Ueda, S. Vievard, N. Watanabe, M. Zechmeister. 2020. "Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)." Astronomy & Astrophysics, Volume 642, pp. A236 - A236. https://doi.org/10.1051/0004-6361/2020389670004-63611432-0746https://hdl.handle.net/2144/42230We present the confirmation and characterisation of GJ 3473 b (G 50–16, TOI-488.01), a hot Earth-sized planet orbiting an M4 dwarf star, whose transiting signal (P = 1.1980035 ± 0.0000018 d) was first detected by the Transiting Exoplanet Survey Satellite (TESS). Through a joint modelling of follow-up radial velocity observations with CARMENES, IRD, and HARPS together with extensive ground-based photometric follow-up observations with LCOGT, MuSCAT, and MuSCAT2, we determined a precise planetary mass, M_b = 1.86 ± 0.30 M_⨁, and radius, R_b = 1.264 ± 0.050 R_⊕. Additionally, we report the discovery of a second, temperate, non-transiting planet in the system, GJ 3473 c, which has a minimum mass, M_c sin i = 7.41 ± 0.91 M_⊕, and orbital period, P_c = 15.509 ± 0.033 d. The inner planet of the system, GJ 3473 b, is one of the hottest transiting Earth-sized planets known thus far, accompanied by a dynamical mass measurement, which makes it a particularly attractive target for thermal emission spectroscopy.p. A236en-USPlanetary systemsPlanets and satellites: detectionTechniques: radial velocitiestechniques: photometricStars: late-typeStars: individual: G 50-16Astronomy & astrophysicsAstronomical and space sciencesArticle10.1051/0004-6361/2020389670000-0002-0638-8822 (Muirhead, PS)576002