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

Bibcode
2019A&A...628A..39L
DOI
10.1051/0004-6361/201935801
Luque, R.; Pallé, E.; Kossakowski, D.; Dreizler, S.; Kemmer, J.; Espinoza, N.; Burt, J.; Anglada-Escudé, G.; Béjar, V. J. S.; Caballero, J. A.; Collins, K. A.; Collins, K. I.; Cortés-Contreras, M.; Díez-Alonso, E.; Feng, F.; Hatzes, A.; Hellier, C.; Henning, T.; Jeffers, S. V.; 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, J. N.; Zapatero Osorio, M. R.; Zechmeister, M.; Amado, P. J.; Anderson, D. R.; Batalha, N. E.; Bauer, F. F.; Bluhm, P.; Burke, C. J.; Butler, R. P.; Caldwell, D. A.; Chen, G.; Crane, J. D.; Dragomir, D.; Dressing, C. D.; Dynes, S.; Jenkins, J. M.; Kaminski, A.; Klahr, H.; Kotani, T.; Lafarga, M.; Latham, D. W.; Lewin, P.; McDermott, S.; Montañés-Rodríguez, P.; Morales, J. C.; Murgas, F.; Nagel, E.; Pedraz, S.; Ribas, I.; Ricker, G. R.; Rowden, P.; Seager, S.; Shectman, S. A.; Tamura, M.; Teske, J.; Twicken, J. D.; Vanderspeck, R.; Wang, S. X.; Wohler, B.
Bibliographical reference

Astronomy and Astrophysics, Volume 628, id.A39, 18 pp.

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8
2019
Journal
Astronomy and Astrophysics
Number of authors
76
IAC number of authors
8
Citations
108
Refereed citations
101
Description
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. RV data are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/628/A39
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Very Low Mass Stars, Brown Dwarfs and Planets

Our goal is to study the processes that lead to the formation of low mass stars, brown dwarfs and planets and to characterize the physical properties of these objects in various evolutionary stages. Low mass stars and brown dwarfs are likely the most numerous type of objects in our Galaxy but due to their low intrinsic luminosity they are not so

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Rebolo López
In progress
Projects' name image
Exoplanets and Astrobiology

The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable

Enric
Pallé Bago
In progress
Type
Refereed
Techniques
Stellar & Interstellar Physics (FEEI)
Exoplanetary Systems & Solar System (SEYSS)

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