Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b
- 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.
- Pallé, E.
- Reiners, A.
- Ribas, I.
- Ricker, G.
- Rodríguez, E.
- Seager, S.
- Vanderspek, R.
- Wells, R.
- Winn, J.
- Aceituno, F. J.
- Béjar, V. J. S.
- Barclay, T.
- Bluhm, P.
- Chaturvedi, P.
- Cifuentes, C.
- Collins, K. I.
- Cortés-Contreras, M.
- Demory, B.-O.
- Fausnaugh, M. M.
- Fukui, A.
- Gómez Maqueo Chew, Y.
- Galadí-Enríquez, D.
- Gan, T.
- Gillon, M.
- Golovin, A.
- Hatzes, A. P.
- Henning, Th.
- Huang, C.
- Jeffers, S. V.
- Kaminski, A.
- Kunimoto, M.
- Kürster, M.
- López-González, M. J.
- Lafarga, M.
- Luque, R.
- McCormac, J.
- Molaverdikhani, K.
- Montes, D.
- Morales, J. C.
- Passegger, V. M.
- Reffert, S.
- Sabin, L.
- Schöfer, P.
- Schanche, N.
- Schlecker, M.
- Schroffenegger, U.
- Schwarz, R. P.
- Schweitzer, A.
- Sota, A.
- Tenenbaum, P.
- Trifonov, T.
- Vanaverbeke, S.
- Zechmeister, M.
DOIAbstract
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 Rb = 1.150 ± 0.040 R⊕, a mass of Mb = 1.21 ± 0.42 M⊕, and an orbital period of Pb = 2.6162745 ± 0.0000030 d. The resulting density of ρb = 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, ...
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