Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)
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 () 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, and radius, . Additionally, we report the discovery of a second, temperate, non-transiting planet in the system, GJ 3473 c, which has a minimum mass, and orbital period, . 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.
Cite
@article{arxiv.2009.10432,
title = {Discovery of a hot, transiting, Earth-sized planet and a second temperate, non-transiting planet around the M4 dwarf GJ 3473 (TOI-488)},
author = {J. Kemmer and S. Stock and D. Kossakowski and A. Kaminski and K. Molaverdikhani and M. Schlecker and J. A. Caballero and P. J. Amado and N. Astudillo-Defru and X. Bonfils and D. Ciardi and K. A. Collins and N. Espinoza and A. Fukui and T. Hirano and J. M. Jenkins and D. W. Latham and E. C. Matthews and N. Narita and E. Pallé and H. Parviainen and A. Quirrenbach and A. Reiners and I. Ribas and G. Ricker and J. E. Schlieder and S. Seager and R. V and J. N. Winn and J. M. Almenara and V. J. S. Béjar and P. Bluhm and F. Bouchy and P. Boyd and J. L. Christiansen and C. Cifuentes and R. Cloutier and K. I. Collins and M. Cortés-Contreras and I. J M. Crossfield and N. Crouzet and J. P. de Leon and D. D. Della-Rose and X. Delfosse and S. Dreizler and E. Esparza-Borges and Z. Essack and Th. Forveille and P. Figueira and D. Galadí-Enríquez and T. Gan and A. Glidden and E. J. Gonzales and P. Guerra and H. Harakawa and A. P. Hatzes and Th. Henning and E. Herrero and K. Hodapp and Y. Hori and S. B. Howell and M. Ikoma and K. Isogai and S. V. Jeffers and M. Kürster and K. Kawauchi and T. Kimura and P. Klagyivik and T. Kotani and T. Kurokawa and N. Kusakabe and M. Kuzuhara and M. Lafarga and J. H. Livingston and R. Luque and R. Matson and J. C. Morales and M. Mori and P. S. Muirhead and F. Murgas and J. Nishikawa and T. Nishiumi and M. Omiya and S. Reffert and C. Rodríguez López and N. C. Santos and P. Schöfer and R. P. Schwarz and B. Shiao and M. Tamura and Y. Terada and J. D. Twicken and A. Ueda and S. Vievard and N. Watanabe and M. Zechmeister},
journal= {arXiv preprint arXiv:2009.10432},
year = {2020}
}
Comments
21 pages; accepted for publication in A&A