Gliese 357

From Wikipedia, the free encyclopedia
  (Redirected from GJ 357)
Jump to navigation Jump to search
Gliese 357
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 09h 36m 01.6373s[1]
Declination −21° 39′ 38.878″[1]
Apparent magnitude (V) 10.906[2]
Characteristics
Evolutionary stage main sequence
Spectral type M2.5V[3]
Astrometry
Radial velocity (Rv)−34.58[4] km/s
Proper motion (μ) RA: 138.694[1] mas/yr
Dec.: −990.311[1] mas/yr
Parallax (π)105.8830 ± 0.0569[1] mas
Distance30.80 ± 0.02 ly
(9.444 ± 0.005 pc)
Absolute magnitude (MV)+11.13[5]
Details
Mass0.362[6] M
Radius0.333[5] R
Luminosity0.014[7] L
Surface gravity (log g)4.96[6] cgs
Temperature3,488[6] K
Metallicity [Fe/H]−0.14[6] dex
Rotational velocity (v sin i)2.5[6] km/s
Other designations
HIP 47103, 2MASS 09360161-2139371, TOI 562
Database references
SIMBADdata

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

Planetary system[edit]

The star has three confirmed exoplanets in its orbit,[10] one of which, GJ 357 d, is considered to be a "super-Earth" within the circumstellar habitable zone.[11][9][12][13] The system is part of the Hydra constellation.[9]

The Gliese 357 planetary system[14]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 0.006566±0.00101 MJ 0.033± 3.93086±0.00004 0.047+0.059
−0.047
88.496+0.0025
−0
°
0.1041±0.0033 RJ
c ≥0.01158±0.00151 MJ 0.0607± 9.1246±0.0013 0.072±0.053
d ≥0.0227±0.0053 MJ 0.204± 55.698±0.45 0.033+0.057
−0.033

References[edit]

  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 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. ^ Nidever, David L.; Marcy, Geoffrey W.; Butler, R. Paul; Fischer, Debra A.; Vogt, Steven S.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2002). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
  5. ^ a b 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.
  6. ^ a b c d e Passegger, V. M.; Reiners, A.; 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.
  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. ^ 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. ^ a b c Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System". SciTechDaily. Retrieved 2019-08-01.
  10. ^ "The Extrasolar Planet Encyclopaedia — Gj 357 b". exoplanet.eu. Retrieved 2019-08-01.
  11. ^ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable, Axios, August 1, 2019
  12. ^ "Potentially habitable 'super-Earth' discovered just 31 light-years away". NBC News. Retrieved 2019-08-01.
  13. ^ Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". NASA. Retrieved 2019-08-01.
  14. ^ Planet GJ 357 b at exoplanets.eu