Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization
- 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
- Wohler, B
DOIAbstract
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 M...
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