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

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 fro...

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Main Authors: Kemmer, Jonas (Author) , Dreizler, S. (Author) , Kossakowski, Diana (Author) , Stock, Stephan (Author) , Quirrenbach, Andreas (Author) , Caballero, J. A. (Author) , Amado, P. J. (Author) , Collins, K. A. (Author) , Espinoza, N. (Author) , Herrero, E. (Author) , Jenkins, J. M. (Author) , Latham, D. W. (Author) , Lillo-Box, J. (Author) , Narita, N. (Author) , Pallé, E. (Author) , Reiners, A. (Author) , Ribas, I. (Author) , Ricker, G. (Author) , Rodríguez, E. (Author) , Seager, S. (Author) , Vanderspek, R. (Author) , Wells, R. (Author) , Winn, J. (Author) , Aceituno, F. J. (Author) , Béjar, V. J. S. (Author) , Barclay, T. (Author) , Bluhm, Paz (Author) , Chaturvedi, P. (Author) , Cifuentes, C. (Author) , Collins, K. I. (Author) , Cortés-Contreras, M. (Author) , Demory, B.-O. (Author) , Fausnaugh, M. M. (Author) , Fukui, A. (Author) , Chew, Y. Gómez Maqueo (Author) , Galadí-Enríquez, D. (Author) , Gan, T. (Author) , Gillon, M. (Author) , Golovin, A. (Author) , Hatzes, A. P. (Author) , Henning, Thomas (Author) , Huang, C. (Author) , Jeffers, S. V. (Author) , Kaminski, Adrian (Author) , Kunimoto, M. (Author) , Kürster, Martin (Author) , López-González, M. J. (Author) , Lafarga, M. (Author) , Luque, R. (Author) , McCormac, J. (Author) , Molaverdikhani, K. (Author) , Montes, D. (Author) , Morales, J. C. (Author) , Passegger, V. M. (Author) , Reffert, Sabine (Author) , Sabin, L. (Author) , Schöfer, P. (Author) , Schanche, N. (Author) , Schlecker, M. (Author) , Schroffenegger, U. (Author) , Schwarz, R. P. (Author) , Schweitzer, A. (Author) , Sota, A. (Author) , Tenenbaum, P. (Author) , Trifonov, Trifon (Author) , Vanaverbeke, S. (Author) , Zechmeister, M. (Author)
Format: Article (Journal)
Language:English
Published: 02 March 2022
In: Astronomy and astrophysics
Year: 2022, Volume: 659, Pages: 1-23
ISSN:1432-0746
DOI:10.1051/0004-6361/202142653
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1051/0004-6361/202142653
Verlag, lizenzpflichtig, Volltext: https://www.aanda.org/articles/aa/abs/2022/03/aa42653-21/aa42653-21.html
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Author Notes:J. Kemmer, S. Dreizler, D. Kossakowski, S. Stock, A. Quirrenbach, J.A. Caballero, P.J. Amado, K.A. Collins, N. Espinoza, E. Herrero, J.M. Jenkins, D.W. Latham, J. Lillo-Box, N. Narita, E. Pallé, A. Reiners, I. Ribas, G. Ricker, E. Rodríguez, S. Seager, R. Vanderspek, R. Wells, J. Winn, F.J. Aceituno, V.J.S. Béjar, T. Barclay, P. Bluhm, P. Chaturvedi, C. Cifuentes, K.I. Collins, M. Cortés-Contreras, B.-O. Demory, M.M. Fausnaugh, A. Fukui, Y. Gómez Maqueo Chew, D. Galadí-Enríquez, T. Gan, M. Gillon, A. Golovin, A.P. Hatzes, Th. Henning, C. Huang, S.V. Jeffers, A. Kaminski, M. Kunimoto, M. Kürster, M. J. López-González, M. Lafarga, R. Luque, J. McCormac, K. Molaverdikhani, D. Montes, J.C. Morales, V. M. Passegger, S. Reffert, L. Sabin, P. Schöfer, N. Schanche, M. Schlecker, U. Schroffenegger, R.P. Schwarz, A. Schweitzer, A. Sota, P. Tenenbaum, T. Trifonov, S. Vanaverbeke, and M. Zechmeister
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Summary: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 <i>R<i/><sub>b<sub/> = 1.150 ± 0.040 <i>R<i/><sub>⊕<sub/>, a mass of <i>M<i/><sub>b<sub/> = 1.21 ± 0.42 <i>M<i/><sub>⊕<sub/>, and an orbital period of <i>P<i/><sub>b<sub/> = 2.6162745 ± 0.0000030 <i>d<i/>. The resulting density of <i>ρ<i/><sub>b<sub/> = 4.4 ± 1.6 g cm<sup>−3<sup/> is compatible with the Earth’s mean density of about 5.5 g cm<sup>−3<sup/>. Due to the apparent brightness of the host star (<i>J<i/> = 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 <i>P<i/><sub>[c]<sub/> = 14.303 ± 0.035 d, which is likely unrelated to the stellar rotation period, <i>P<i/><sub>rot<sub/> = 122 ± 13 d, which we determined from archival HATNet and ASAS-SN photometry combined with newly obtained TJO data.
Item Description:Gesehen am 08.04.2022
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202142653

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