格利澤357
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]。
 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 | |
| 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]
| 成員 (依恆星距離) |
質量 | 半長軸 (AU) |
軌道周期 (天) |
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- ^ 1.0 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. - ^ 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 .
- ^ 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.
- ^ 4.0 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.
- ^ 5.0 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.
- ^ 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.
- ^ 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
- ^ 8.0 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）.
- ^ 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
- ^ The Extrasolar Planet Encyclopaedia — Gj 357 b. exoplanet.eu. [2019-08-01]. （原始內容存檔於2022-01-20）.
- ^ Falconer, Rebecca, Newly uncovered super-Earth 31 light-years away may be habitable （頁面存檔備份，存於互聯網檔案館）, Axios, August 1, 2019
- ^ 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）.
- ^ 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）.
- ^ 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.
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