Gliese 357

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Gliese 357
GJ 357 system.png
Artist concept of the Gliese 357 (GJ357) system.
Credit: Jack Madden
Observation data
Epoch J2000       Equinox J2000
Constellation Hydra [1]
Right ascension 09h 36m 01.63722s [2]
Declination −21° 39′ 38.8776″ [2]
Apparent magnitude  (V)10.906 [3]
Characteristics
Evolutionary stage main sequence [4]
Spectral type M2.5V [5]
Astrometry
Radial velocity (Rv)−35.03±0.17 [2] km/s
Proper motion (μ)RA: 138.722(23) mas/yr [2]
Dec.: −990.342(20) mas/yr [2]
Parallax (π)105.9789±0.0227  mas [2]
Distance 30.776 ± 0.007  ly
(9.436 ± 0.002  pc)
Absolute magnitude  (MV)+11.13 [6]
Details
Mass 0.362 [4]   M☉
Radius 0.333 [6]   R☉
Luminosity 0.014 [7]   L☉
Surface gravity (log g)4.96 [4]   cgs
Temperature 3,488 [4]   K
Metallicity [Fe/H]−0.14 [4]   dex
Rotation 74.3±1.7  d [8]
Rotational velocity (v sin i)2.5 [4]  km/s
Other designations
HIP 47103, TOI-562, 2MASS 09360161-2139371
Database references
SIMBAD data
Exoplanet Archive data

GJ 357 (Gliese 357) is an M-type main sequence star with an unusually low star spot activity. [9] It is located 31 light-years from the Solar System, [10] in the Hydra constellation. [10]

Planetary system

The star has three confirmed exoplanets in its orbit. [11] One of these, Gliese 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone. [12] [10] [13] [14]

Transmission spectroscopy of the planet b with JWST in 2025 found no clear evidence for atmospheric molecules, although a secondary atmosphere is considered likely to exist. [15] Similarly, another 2025 analysis of the JWST transmission spectrum found no atmospheric molecules, but was able to rule out an atmosphere composed mainly of low-molar mass molecules (less than 8 g/mol) and an abundance of metals less than 300 times that of the Sun. [16]

The Gliese 357 planetary system [17]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b1.84±0.31  M🜨 0.035±0.0023.93072+0.00008
−0.00006		0.047+0.059
−0.047		89.12+0.37
−0.31 ° 		1.217+0.084
−0.083  R🜨
c≥3.40±0.46  M🜨 0.061±0.0049.1247+0.0011
−0.0010		0.072±0.053——
d ≥6.1±1.0  M🜨 0.204±0.01555.661±0.0550.033+0.057
−0.033		——

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. ↑ Koen, C.; Kilkenny, D.; Van Wyk, F.; Marang, F. (2010). "UBV(RI)C JHK observations of Hipparcos-selected nearby stars". Monthly Notices of the Royal Astronomical Society. 403 (4): 1949. Bibcode:2010MNRAS.403.1949K. doi: 10.1111/j.1365-2966.2009.16182.x .
  4. 1 2 3 4 5 6 Passegger, V. M.; Reiners, Ansgar; Jeffers, S. V.; Wende-von Berg, S.; Schöfer, P.; Caballero, J. A.; Schweitzer, A.; Amado, P. J.; Béjar, V. J. S.; Cortés-Contreras, M.; Hatzes, A. P.; Kürster, M.; Montes, D.; Pedraz, S.; Quirrenbach, A.; Ribas, I.; Seifert, W. (2018). "The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy". Astronomy and Astrophysics. 615: A6. arXiv: 1802.02946 . Bibcode:2018A&A...615A...6P. doi:10.1051/0004-6361/201732312. S2CID   55639432.
  5. ↑ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv: astro-ph/0603770 . Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID   119476992.
  6. 1 2 Houdebine, E. R.; Mullan, D. J.; Paletou, F.; Gebran, M.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2016). "Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin I and P/Sin I for a Large Sample of Late-K and M Dwarfs". The Astrophysical Journal. 822 (2): 97. arXiv: 1604.07920 . Bibcode:2016ApJ...822...97H. doi: 10.3847/0004-637X/822/2/97 . S2CID   119118088.
  7. ↑ Morales, J. C.; Ribas, I.; Jordi, C.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2008). "The effect of activity on stellar temperatures and radii". Astronomy and Astrophysics. 478 (2): 507. arXiv: 0711.3523 . Bibcode:2008A&A...478..507M. doi:10.1051/0004-6361:20078324. S2CID   16238033.
  8. ↑ Suárez Mascareño, A.; Rebolo, R.; González Hernández, J. I.; Esposito, M. (2015). "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators". Monthly Notices of the Royal Astronomical Society. 452 (3): 2745–2756. arXiv: 1506.08039 . Bibcode:2015MNRAS.452.2745S. doi: 10.1093/mnras/stv1441 .
  9. ↑ Modirrousta-Galian, D.; Stelzer, B.; Magaudda, E.; Maldonado, J.; Güdel, M.; Sanz-Forcada, J.; Edwards, B.; Micela, G. (2020). "A Super-Earth Orbiting an Extremely Inactive Host Star". Astronomy & Astrophysics. A113: 641. arXiv: 2007.10262 . doi:10.1051/0004-6361/202038280. S2CID   220647396.
  10. 1 2 3 Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System". SciTechDaily. Archived from the original on 2019-08-01. Retrieved 2019-08-01.
  11. ↑ "The Extrasolar Planet Encyclopaedia — Gj 357 b". Extrasolar Planets Encyclopaedia . 1995. Archived from the original on 2023-11-07. Retrieved 2019-08-01.
  12. ↑ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable Archived 2019-12-18 at the Wayback Machine , Axios, August 1, 2019
  13. ↑ "Potentially habitable 'super-Earth' discovered just 31 light-years away". NBC News. 31 July 2019. Archived from the original on 2019-07-31. Retrieved 2019-08-01.
  14. ↑ Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". NASA. Archived from the original on 2019-08-01. Retrieved 2019-08-01.
  15. ↑ Taylor, Jake; Radica, Michael; Chatterjee, Richard D.; Hammond, Mark; Meier, Tobias; Aigrain, Suzanne; MacDonald, Ryan J.; Albert, Loic; Benneke, Björn; Coulombe, Louis-Philippe; Cowan, Nicolas B.; Dang, Lisa; Doyon, René; Flagg, Laura; Johnstone, Doug; Kaltenegger, Lisa; Lafrenière, David; Pelletier, Stefan; Piaulet-Ghorayeb, Caroline; Rowe, Jason F.; Roy, Pierre-Alexis (2025). "JWST NIRISS Transmission Spectroscopy of the Super-Earth GJ 357b, a Favourable Target for Atmospheric Retention". Monthly Notices of the Royal Astronomical Society. 540 (4): 3677. arXiv: 2505.24462 . Bibcode:2025MNRAS.540.3677T. doi: 10.1093/mnras/staf894 .
  16. ↑ Redai, Jea Adams; Wogan, Nicholas; Wallack, Nicole L.; Alam, Munazza K.; Aguichine, Artyom; Wolfgang, Angie; Wakeford, Hannah R.; Teske, Johanna; Scarsdale, Nicholas (2025-07-09). "JWST COMPASS: A NIRSpec G395H Transmission Spectrum of the Super-Earth GJ 357 b". The Astronomical Journal. 170 (4): 219. arXiv: 2507.07165 . Bibcode:2025AJ....170..219A. doi: 10.3847/1538-3881/adee92 .
  17. ↑ Luque, R.; Pallé, E.; et al. (August 2019). "Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization". Astronomy & Astrophysics . 628: A39. arXiv: 1904.12818 . Bibcode:2019A&A...628A..39L. doi:10.1051/0004-6361/201935801. S2CID   139102184.
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