Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)

DOI: 
10.1051/0004-6361/202038967
Publication date: 
20/11/2020
Main author: 
Kemmer J.
IAA authors: 
Amado, P.J.;Rodríguez López, C.
Authors: 
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., Vanderspek R., 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 T., Figueira P., Galadí-Enríquez D., Gan T., Glidden A., Gonzales E.J., Guerra P., Harakawa H., Hatzes A.P., Henning T., 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., Rodríguez López C., 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.
Journal: 
Astronomy and Astrophysics
Refereed: 
Yes
Publication type: 
Article
Volume: 
642.0
Pages: 
A236
Number: 
A236
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. © 2020 ESO.
Database: 
SCOPUS
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020A&A...642A.236K/abstract
ADS Bibcode: 
2020A&A...642A.236K
Keywords: 
Planetary systems; Planets and satellites: detection; Stars: individual: G 50-16; Stars: late-type; Techniques: photometric; Techniques: radial velocities