Gliese 357: Difference between revisions
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| caption = Artist concept of the Gliese 357 (GJ357) system. |
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| credit = Jack Madden |
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Revision as of 16:10, 30 August 2021
 Artist concept of the Gliese 357 (GJ357) system. Credit: Jack Madden | |
| 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 mas[1] |
| Distance | 30.80 ± 0.02 ly (9.444 ± 0.005 pc) |
| Absolute magnitude (MV) | +11.13[5] |
| Details | |
| Mass | 0.362[6] M☉ |
| Radius | 0.333[5] R☉ |
| Luminosity | 0.014[7] L☉ |
| Surface gravity (log g) | 4.96[6] cgs |
| Temperature | 3,488[6] K |
| Metallicity [Fe/H] | −0.14[6] dex |
| Rotational velocity (v sin i) | 2.5[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
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]
| 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
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
{{cite journal}}: CS1 maint: unflagged free DOI (link) - ^ 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.
- ^ 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.
- ^ 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
- ^ 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.
- ^ "The Extrasolar Planet Encyclopaedia — Gj 357 b". exoplanet.eu. Retrieved 2019-08-01.
- ^ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable, Axios, August 1, 2019
- ^ "Potentially habitable 'super-Earth' discovered just 31 light-years away". NBC News. Retrieved 2019-08-01.
- ^ Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". NASA. Retrieved 2019-08-01.
- ^ Planet GJ 357 b at exoplanets.eu
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