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
Right ascension 09h 36m 01.63722s [1]
Declination −21° 39′ 38.8776″ [1]
Apparent magnitude  (V)10.906 [2]
Characteristics
Evolutionary stage main sequence
Spectral type M2.5V [3]
Astrometry
Radial velocity (Rv)−35.03±0.17 [1]  km/s
Proper motion (μ)RA: 138.722±0.023  mas/yr [1]
Dec.: −990.342±0.020  mas/yr [1]
Parallax (π)105.9789 ± 0.0227  mas [1]
Distance 30.776 ± 0.007  ly
(9.436 ± 0.002  pc)
Absolute magnitude  (MV)+11.13 [4]
Details
Mass 0.362 [5]   M☉
Radius 0.333 [4]   R☉
Luminosity 0.014 [6]   L☉
Surface gravity (log g)4.96 [5]   cgs
Temperature 3,488 [5]   K
Metallicity [Fe/H]−0.14 [5]   dex
Rotation 74.3±1.7  d [7]
Rotational velocity (v sin i)2.5 [5]  km/s
Other designations
HIP  47103, 2MASS 09360161-2139371, TOI 562
Database references
SIMBAD data

GJ 357 (Gliese 357) is an M-type main sequence star with an unusually low star spot activity. [8] It is located 31 light-years from the Solar System, [9] in the Hydra constellation. [9]

Planetary system

The star has three confirmed exoplanets in its orbit. [10] One of these, Gliese 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone. [11] [9] [12] [13]

Planets b and c are close to 3:7 mean-motion resonance. Presuming resonance chain extends to the outermost, cold, super-terrestrial Gliese 357 d and the resonances are simple, GJ 357 might have a more suitable planet for life with an approximate 27.5 day period and almost Earth's flux. Additionally, it might host a Mars-sized planet in 2:1 period ratio with GJ 357 c and 2:3 ratio with hypothetical HZ rocky planet.[ citation needed ]

The Gliese 357 planetary system [14]
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		——

Related Research Articles

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<span class="mw-page-title-main">Gliese 667</span> Triple star system in the constellation Scorpius

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<span class="mw-page-title-main">Gliese 581d</span> Contested super-Earth orbiting Gliese 581

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Gliese 832 b is a gas giant exoplanet about 80% the mass of Jupiter, located 16.2 light-years from the Sun in the constellation of Grus, orbiting the red dwarf star Gliese 832.

Gliese 433 is a dim red dwarf star with multiple exoplanetary companions, located in the equatorial constellation of Hydra. The system is located at a distance of 29.6 light-years from the Sun based on parallax measurements, and it is receding with a radial velocity of +18 km/s. Based on its motion through space, this is an old disk star. It is too faint to be viewed with the naked eye, having an apparent visual magnitude of 9.81 and an absolute magnitude of 10.07.

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Gliese 180, is a small red dwarf star in the equatorial constellation of Eridanus. It is invisible to the naked eye with an apparent visual magnitude of 10.9. The star is located at a distance of 39 light years from the Sun based on parallax, and is drifting closer with a radial velocity of −14.6 km/s. It has a high proper motion, traversing the sky at the rate of 0.765 arcseconds per year.

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Gliese 514, also known as BD+11 2576 or HIP 65859, is a M-type main-sequence star, in the constellation Virgo 24.85 light-years away from the Sun. The proximity of Gliese 514 to the Sun was known exactly since 1988.

References

  1. 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.
  2. ↑ 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 .
  3. ↑ 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.
  4. 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.
  5. 1 2 3 4 5 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.
  6. ↑ 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.
  7. ↑ 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
  8. ↑ 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
  9. 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.
  10. ↑ "The Extrasolar Planet Encyclopaedia — Gj 357 b". Extrasolar Planets Encyclopaedia . 1995. Archived from the original on 2023-11-07. Retrieved 2019-08-01.
  11. ↑ 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
  12. ↑ "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.
  13. ↑ 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.
  14. ↑ 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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