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  • Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
    Kemmer, J; Stock, S; Kossakowski, D; Kaminski, A; Molaverdikhani, K; Schlecker, M; Caballero, J A; Amado, P J; Astudillo-Defru, N; Bonfils, X; Ciardi, D; Collins, K A; Espinoza, N; Fukui, A; Hirano, T; Jenkins, J M; Latham, D W; Matthews, E C; Narita, N; Pallé, E; Parviainen, H; Quirrenbach, A; Reiners, A; Ribas, I; Ricker, G; Schlieder, J E; Seager, S; R V; Winn, J N; Almenara, J M; Béjar, V J S; Bluhm, P; Bouchy, F; Boyd, P; Christiansen, J L; Cifuentes, C; Cloutier, R; Collins, K I; Cortés-Contreras, M; Crossfield, I J M; Crouzet, N; de Leon, J P; Della-Rose, D D; Delfosse, X; Dreizler, S; Esparza-Borges, E; Essack, Z; Forveille, Th; Figueira, P; Galadí-Enríquez, D; Gan, T; Glidden, A; Gonzales, E J; Guerra, P; Harakawa, H; Hatzes, A P; Henning, Th; Herrero, E; Hodapp, K; Hori, Y; Howell, S B; Ikoma, M; Isogai, K; Jeffers, S V; Kürster, M; Kawauchi, K; Kimura, T; Klagyivik, P; Kotani, T; Kurokawa, T; Kusakabe, N; Kuzuhara, M; Lafarga, M; Livingston, J H; Luque, R; Matson, R; Morales, J C; Mori, M; Muirhead, P S; Murgas, F; Nishikawa, J; Nishiumi, T; Omiya, M; Reffert, S; C Rodríguez López; Santos, N C; Schöfer, P; Schwarz, R P; Shiao, B; Tamura, M; Terada, Y; Twicken, J D; Ueda, A; Vievard, S; Watanabe, N; Zechmeister, M

    arXiv.org, 09/2020
    Paper, Journal Article

    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 (\(P=1.1980035\pm0.0000018\mathrm{\,d}\)) 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, \(M_b = 1.86\pm0.30\,\mathrm{M_\oplus},\) and radius, \(R_b = {1.264\pm0.050}\,\mathrm{R_\oplus}\). Additionally, we report the discovery of a second, temperate, non-transiting planet in the system, GJ 3473 c, which has a minimum mass, \(M_c \sin{i} = {7.41\pm0.91}\,\mathrm{M_\oplus,}\) and orbital period, \(P_c={15.509\pm0.033}\,\mathrm{d}\). 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.

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