Luque, R, Pallé, E, Kossakowski, D, Dreizler, S, Kemmer, J, Espinoza, N, Burt, J, Anglada-Escudé, G, Béjar, VJS, Caballero, JA, Collins, KA, Collins, KI, Cortés-Contreras, M, Díez-Alonso, E, Feng, F, Hatzes, A, Hellier, C, Henning, T, Jeffers, SV, Kaltenegger, L, Kürster, M, Madden, J, Molaverdikhani, K, Montes, D, Narita, N, Nowak, G, Ofir, A, Oshagh, M, Parviainen, H, Quirrenbach, A, Reffert, S, Reiners, A, Rodríguez-López, C, Schlecker, M, Stock, S, Trifonov, T, Winn, JN, Zapatero Osorio, MR, Zechmeister, M, Amado, PJ, Anderson, DR, Batalha, NE, Bauer, FF, Bluhm, P, Burke, CJ, Butler, RP, Caldwell, DA, Chen, G, Crane, JD, Dragomir, D, Dressing, CD, Dynes, S, Jenkins, JM, Kaminski, A, Klahr, H, Kotani, T, Lafarga, M, Latham, DW, Lewin, P, McDermott, S, Monta nés-Rodríguez, P, Morales, JC, Murgas, F, Nagel, E, Pedraz, S, Ribas, I, Ricker, GR, Rowden, P, Seager, S, Shectman, SA, Tamura, M, Teske, J, Twicken, JD, Vanderspeck, R, Wang, SX and Wohler, B (2019) Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization. Astronomy and Astrophysics, 628 (A39).

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Abstract

We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (Teq = 525 ± 11 K) with a radius of Rb = 1.217 ± 0.084 R⊕ and an orbital period of Pb = 3.93 d. Precise stellar radial velocities from CARMENES and PFS, as well as archival data from HIRES, UVES, and HARPS also display a 3.93-day periodicity, confirming the planetary nature and leading to a planetary mass of Mb = 1.84 ± 0.31 M⊕. In addition to the radial velocity signal for GJ 357 b, more periodicities are present in the data indicating the presence of two further planets in the system: GJ 357 c, with a minimum mass of Mc = 3.40 ± 0.46 M⊕ in a 9.12 d orbit, and GJ 357 d, with a minimum mass of Md = 6.1 ± 1.0 M⊕ in a 55.7 d orbit inside the habitable zone. The host is relatively inactive and exhibits a photometric rotation period of Prot = 78 ± 2 d. GJ 357 b isto date the second closest transiting planet to the Sun, making it a prime target for further investigations such as transmission spectroscopy. Therefore, GJ 357 b represents one of the best terrestrial planets suitable for atmospheric characterization with the upcoming JWST and ground-based ELTs.

Item Type: Article
Additional Information: This is the final published version of the article (version of record). It first appeared online via EDP Sciences at https://doi.org/10.1051/0004-6361/201935801 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: planetary systems, techniques, photometric, radial velocities, stars, individual, G1 357, late-type
Subjects: Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QB Astronomy > QB799 Stars
Depositing User: Symplectic
Date Deposited: 22 Aug 2019 10:04
Last Modified: 27 Aug 2019 08:29
URI: http://eprints.keele.ac.uk/id/eprint/6726

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