Discovery and mass measurement of the hot, transiting, Earth-sized planet, GJ 3929 b

DOI: 
10.1051/0004-6361/202142653
Publication date: 
01/03/2022
Main author: 
Kemmer J.
IAA authors: 
Amado, P. J.;Rodríguez, E.;Aceituno, F. J.;López-González, M. J.;Luque, R.;Sota, A.
Authors: 
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.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
659.0
Pages: 
A17
Number: 
A17
Abstract: 
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, 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, Prot = 122 ± 13 d, which we determined from archival HATNet and ASAS-SN photometry combined with newly obtained TJO data.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2022A&A...659A..17K/abstract
ADS Bibcode: 
2022A&A...659A..17K
Keywords: 
Planetary systems | Planets and satellites: Detection | Stars: Individual: GJ 3929 | Stars: Late-type | Techniques: Photometric | Techniques: Radial velocities