S. Stock, K. Molaverdikhani, J. Caballero, P. J. Amado, N. Astudillo-Defru, X. Bonfils, D. Ciardi, N. Espinoza, A. Fukui, T. Hirano, J. M. Jenkins, D. W. Latham, 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, F. Bouchy, J. L. Christiansen, R. Cloutier, I. J. M. Crossfield, J. de Leon, X. Delfosse, S. Dreizler, T. Forveille, P. Figueira, D. Galadí-Enríquez, A. Glidden, E. J. Gonzales, A. Hatzes, T. Henning, E. Herrero, R. Luque, R. A. Matson, J. C. Morales, P. S. Muirhead, F. Murgas, S. Reffert, N. C. Santos, M. Tamura, J. D. Twicken, M. Zeballos
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 and Astrophysics
Volume 642, Article Number A236, Number of pages 20
2020 October
