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Kemmer, J.; Dreizler, S.; Kossakowski, D.; Stock, S.; Quirrenbach, A.; Caballero, J. A.; Amado, P. J.; Collins, K. A.; Espinoza, N.; Herrero, E.; Jenkins, J. M.; Latham, D. W.; Lillo-Box, J.; Narita, N.; Palle, E.; Reiners, A.; Ribas, I.; Ricker, G.; Rodriguez, E.; Seager, S.; Vanderspek, R.; Wells, R.; Winn, J.; Aceituno, F. J.; Bejar, V. J. S.; Barclay, T.; Bluhm, P.; Chaturvedi, P.; Cifuentes, C.; Collins, K. I.; Cortes-Contreras, M.; Demory, B.-O.; Fausnaugh, M. M.; Fukui, A.; Chew, Y. Gomez Maqueo; Galadi-Enriquez, D.; Gan, T.; Gillon, M.; Golovin, A.; Hatzes, A. P.; Henning, Th; Huang, C.; Jeffers, S. V.; Kaminski, A.; Kunimoto, M.; Kurster, M.; Lopez-Gonzalez, M. J.; Lafarga, M.; Luque, R.; McCormac, J.; Molaverdikhani, K.; Montes, D.; Morales, J. C.; Passegger, V. M.; Reffert, S.; Sabin, L.; Schofer, P.; Schanche, N.; Schlecker, M.; Schroffenegger, U.; Schwarz, R. P.; Schweitzer, A.; Sota, A.; Tenenbaum, P.; Trifonov, T.; Vanaverbeke, S. and Zechmeister, M. (2022): Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b. In: Astronomy & Astrophysics, Vol. 659, A17

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We report the discovery of GJ 3929 b, a hot Earth-sized planet orbiting the nearby M3.5 V dwarf star, GJ 3929 (G 180-18, TOI-2013). Joint modelling of photometric observations from TESS sectors 24 and 25 together with 73 spectroscopic observations from CARMENES and follow-up transit observations from SAINT-EX, LCOGT, and OSN yields a planet radius of R-b = 1.150 +/- 0.040 R-circle plus, a mass of M-b = 1.21 +/- 0.42 M-circle plus, and an orbital period of P-b = 2.6162745 +/- 0.0000030 d. The resulting density of rho(b) = 4.4 +/- 1.6 g cm(-3) is compatible with the Earth's mean density of about 5.5 g cm(-3). Due to the apparent brightness of the host star (J = 8.7 mag) and its small size, GJ 3929 b is a promising target for atmospheric characterisation with the JWST. Additionally, the radial velocity data show evidence for another planet candidate with P-[c] = 14.303 +/- 0.035 d, which is likely unrelated to the stellar rotation period, P-rot = 122 +/- 13 d, which we determined from archival HATNet and ASAS-SN photometry combined with newly obtained TJO data.

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