J. 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. R. Ricker, J. E. Schlieder, S. Seager, R. K. Vanderspek, J. N. Winn, J. -M. Almenara, V. J. Sánchez Béjar, P. Bluhm, F. Bouchy, P. T. 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, T. Forveille, P. Figueira, D. Galadí-Enríquez, T. Gan, A. Glidden, E. J. Gonzales, P. Guerra, H. Harakawa, A. Hatzes, T. Henning, E. Herrero, K. W. 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. A. 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
Abstract
We 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, Mb = 1.86 ± 0.30 M⊕, and radius, Rb = 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, Mc sin i = 7.41 ± 0.91 M⊕, and orbital period, Pc = 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.
Keywords
planetary systems; planets and satellites: detection; techniques: radial velocities; techniques: photometric; stars: late-type; stars: individual: G 50-16; Astrophysics - Earth and Planetary Astrophysics
Notes
RV data are only available at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/642/A236
Astronomy & Astrophysics
Volume 642, Article Number A236, Number of pages 20
2020 October
