GJ 357 (全寫為 Gliese 357) 是一顆位於長蛇座[8]的紅矮星,具有異常低的星斑活動[9],距離太陽系約30.7光年[8]

Gliese 357
Image showing a red star and three planets. GJ357d is green and covered with life.
藝術家想像中的格利澤357(GJ357)系統
Credit: Jack Madden
觀測資料
曆元 J2000
星座 長蛇座
星官
赤經 09h 36m 01.63722s[1]
赤緯 -21° 39′ 38.8776″[1]
視星等(V) 10.906[2]
特性
演化階段主序星
光譜分類M2.5V[3]
天體測定
徑向速度 (Rv)−35.03±0.17[1] km/s
自行 (μ) 赤經:138.722±0.023 mas/yr
赤緯:−990.342±0.020 mas/yr
視差 (π)105.9789 ± 0.0227[1] mas
距離30.776 ± 0.007 ly
(9.436 ± 0.002 pc)
絕對星等 (MV)+11.13[4]
詳細資料
質量0.362[5] M
半徑0.333[4] R
表面重力 (log g)4.96[5]
亮度0.014[6] L
溫度3,488[5] K
金屬量 [Fe/H]−0.14[5] dex
自轉74.3±1.7 d[7]
自轉速度 (v sin i)2.5[5] km/s
其他命名
HIP 47103、​2MASS 09360161-2139371, TOI 562
參考資料庫
SIMBAD資料

行星系統

編輯

這顆恆星有三顆已知的行星環繞[10],其中一顆行星格利澤357 d被認為在宜居帶內的超級地球[11][8][12][13]

格利澤357的行星系[14]
成員
(依恆星距離)
質量 半長軸
(AU)
軌道周期
()
離心率 傾角 半徑
b 1.84±0.31 M 0.035±0.002 3.93072+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±0.004 9.1247+0.0011
−0.0010
0.072+0.053
d ≥6.1±1.0 M 0.204±0.015 55.661±0.055 0.033+0.057
−0.033

參考資料

編輯
  1. ^ 1.0 1.1 1.2 1.3 Vallenari, A.; et al. Gaia Data Release 3. Summary of the content and survey properties. Astronomy & Astrophysics. 2022. arXiv:2208.00211 . doi:10.1051/0004-6361/202243940 .  已忽略未知參數|collaboration= (幫助) Gaia DR3 record for this source at VizieR.
  2. ^ Koen, C.; Kilkenny, D.; Van Wyk, F.; Marang, F. UBV(RI)C JHK observations of Hipparcos-selected nearby stars. Monthly Notices of the Royal Astronomical Society. 2010, 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. Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample. The Astronomical Journal. 2006, 132 (1): 161–170. Bibcode:2006AJ....132..161G. S2CID 119476992. arXiv:astro-ph/0603770 . doi:10.1086/504637. 
  4. ^ 4.0 4.1 Houdebine, E. R.; Mullan, D. J.; Paletou, F.; Gebran, M.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. 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. 2016, 822 (2): 97. Bibcode:2016ApJ...822...97H. S2CID 119118088. arXiv:1604.07920 . doi:10.3847/0004-637X/822/2/97. 
  5. ^ 5.0 5.1 5.2 5.3 5.4 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. The CARMENES search for exoplanets around M dwarfs. Photospheric parameters of target stars from high-resolution spectroscopy. Astronomy and Astrophysics. 2018, 615: A6. Bibcode:2018A&A...615A...6P. S2CID 55639432. arXiv:1802.02946 . doi:10.1051/0004-6361/201732312. 
  6. ^ Morales, J. C.; Ribas, I.; Jordi, C.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. The effect of activity on stellar temperatures and radii. Astronomy and Astrophysics. 2008, 478 (2): 507. Bibcode:2008A&A...478..507M. S2CID 16238033. arXiv:0711.3523 . doi:10.1051/0004-6361:20078324. 
  7. ^ Suárez Mascareño, A.; Rebolo, R.; González Hernández, J. I.; Esposito, M., Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators, Monthly Notices of the Royal Astronomical Society, 2015, 452 (3): 2745–2756, Bibcode:2015MNRAS.452.2745S, arXiv:1506.08039 , doi:10.1093/mnras/stv1441 
  8. ^ 8.0 8.1 8.2 Reddy, Francis; Center, NASA’s Goddard Space Flight. TESS Discovers Habitable Zone Planet in GJ 357 System. SciTechDaily. 2019-07-31 [2019-08-01]. (原始內容存檔於2019-08-01) (美國英語). 
  9. ^ Modirrousta-Galian, D.; Stelzer, B.; Magaudda, E.; Maldonado, J.; Güdel, M.; Sanz-Forcada, J.; Edwards, B.; Micela, G., A Super-Earth Orbiting an Extremely Inactive Host Star, Astronomy & Astrophysics, 2020, A113: 641, S2CID 220647396, arXiv:2007.10262 , doi:10.1051/0004-6361/202038280 
  10. ^ The Extrasolar Planet Encyclopaedia — Gj 357 b. exoplanet.eu. [2019-08-01]. (原始內容存檔於2022-01-20). 
  11. ^ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable頁面存檔備份,存於網際網路檔案館, Axios, August 1, 2019
  12. ^ Potentially habitable 'super-Earth' discovered just 31 light-years away. NBC News. [2019-08-01]. (原始內容存檔於2019-07-31) (英語). 
  13. ^ Garner, Rob. NASA's TESS Helps Find Intriguing New World. NASA. 2019-07-30 [2019-08-01]. (原始內容存檔於2019-08-01). 
  14. ^ Luque, R.; Pallé, E.; et al. Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization. Astronomy & Astrophysics. August 2019, 628: A39. Bibcode:2019A&A...628A..39L. S2CID 139102184. arXiv:1904.12818 . doi:10.1051/0004-6361/201935801.