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Luque, R, Fulton, BJ, Kunimoto, M, Amado, PJ, Gorrini, P, Dreizler, S, Hellier, C, Henry, GW, Molaverdikhani, K, Morello, G, Pena-Monino, L, Perez-Torres, M, Pozuelos, FJ, Shan, Y, Anglada-Escude, G, Bejar, VJS, Bergond, G, Boyle, AW, Caballero, JA, Charbonneau, D, Ciardi, DR, Dufoer, S, Espinoza, N, Everett, M, Fischer, D, Hatzes, AP, Henning, T, Hesse, K, Howard, AW, Howell, SB, Isaacson, H, Jeffers, SV, Jenkins, JM, Kane, SR, Kemmer, J, Khalafinejad, S, Jr, KRC, Kossakowski, D, Latham, DW, Lillo-Box, J, Lissauer, JJ, Montes, D, Orell-Miquel, J, Palle, E, Pollacco, D, Quirrenbach, A, Reffert, S, Reiners, A, Ribas, I, Ricker, GR, Rogers, LA, Sanz-Forcada, J, Schlecker, M, Schweitzer, A, Seager, S, Shporer, A, Stassun, KG, Stock, S, Tal-Or, L, Ting, EB, Trifonov, T, Vanaverbeke, S, Vanderspek, R, Villasenor, J, Winn, JN, Winters, JG and Osorio, MRZ (2022) The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc. Astronomy and Astrophysics: a European journal, 664 (A199). 1 - 23. ISSN 0004-6361

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Abstract

We report the discovery of a multiplanetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of Rb = 1.240 ± 0.023 R⊕, a mass of Mb = 2.14 ± 0.34 M⊕, and a bulk density of ρb = 6.2 ± 1.0 g cm−3, and HD 260655 c, with a period of 5.71 d, a radius of , a mass of Mc = 3.09 ± 0.48 M⊕, and a bulk density of g cm−3. The planets have been detected in transit by the Transiting Exoplanet Survey Satellite (TESS) mission and confirmed independently with archival and new precise radial velocities obtained with the HIRES and CARMENES instruments since 1998 and 2016, respectively. At a distance of 10 pc, HD 260655 has become the fourth closest known multitransiting planet system after HD 219134, LTT 1445 A, and AU Mic. Due to the apparent brightness of the host star (J = 6.7 mag), both planets are among the most suitable rocky worlds known today for atmospheric studies with the James Webb Space Telescope, both in transmission and emission.

Item Type: Article
Additional Information: Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This article is published in open access under the Subscribe-to-Open model. Subscribe to A&A to support open access publication.
Uncontrolled Keywords: planetary systems, techniques: photometric, techniques: radial velocities, stars: late-type, planets and satellites: individual: HD 260655
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 06 Oct 2022 14:23
Last Modified: 06 Oct 2022 14:23
URI: https://eprints.keele.ac.uk/id/eprint/11524

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