HD 82943

HD 82943
觀測資料
曆元 J2000
星座 長蛇座
星官
赤經 09h 34m 50.73655s[1]
赤緯 −12° 07′ 46.3733″[1]
視星等(V) 6.54
特性
光谱分类F9 V Fe+0.5[2]
天体测定
自行 (μ) 赤经:+3.00[1] mas/yr
赤纬:-175.01[1] mas/yr
视差 (π)36.40 ± 0.47[1] mas
距离90 ± 1 ly
(27.5 ± 0.4 pc)
詳細資料
質量1.14 ± 0.08[3] M
表面重力 (log g)4.35 ± 0.04[3]
溫度5,929 ± 45[3] K
金属量 [Fe/H]0.34[3] dex
自轉速度 (v sin i)1.35 ± 0.5[4] km/s
年齡3.0 ± 0.7[3] Gyr
其他命名
164 G. Hya, BD-11 2670, HD 82943, HIP 47007, SAO 155312.
參考資料庫
SIMBAD资料

HD 82943,即長蛇座164 G.(164 G. Hydrae) ,是一顆距離地球約89光年的黃矮星,位於長蛇座。該恆星旁已確認有兩顆系外行星存在[5][4],並且有說法認為另有其他行星已被該恆星吞噬[6]。HD 82943的質量大約是太陽的1.15倍[7]

行星系統

該系統的第一顆行星 HD 82943 b 於2000年由米歇爾·麥耶帶領的一組天文學家宣布發現[8]。該行星和母恆星距離是1.19天文單位,公轉週期約441日。接近一年後同樣一組科學家宣布發現第二顆行星 HD 82943 c。第二顆行星與母恆星的距離較第一顆近,為0.746天文單位,軌道週期219日[7]。這兩顆行星有比例2:1的軌道共振[7]

2001年宣布 HD 82943 有含量異常高的鋰-6同位素。恆星在一般狀況下並不會有這種鋰同位素,但是行星的溫度不可能到達使鋰-6產生核反應的溫度,因此在行星中這種同位素是可以存在的[6]。而最簡單的解釋就是至少有一顆行星或行星物質被恆星吞噬,這種情況在經過了恆星早期演化階段後有時會發生。

HD 82943的行星系[7]
成員
(依恆星距離)
质量 半長軸
(AU)
轨道周期
()
離心率 傾角 半径
c 2.01 MJ 0.746 219.3 0.359
b 1.75 MJ 1.19 441.2 0.219

參見

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F., Validation of the new Hipparcos reduction, Astronomy and Astrophysics, November 2007, 474 (2): 653–664, Bibcode:2007A&A...474..653V, arXiv:0708.1752可免费查阅, doi:10.1051/0004-6361:20078357 
  2. ^ Gray, R. O.; et al, Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample, The Astronomical Journal, July 2006, 132 (1): 161–170, Bibcode:2006AJ....132..161G, arXiv:astro-ph/0603770可免费查阅, doi:10.1086/504637 
  3. ^ 3.0 3.1 3.2 3.3 3.4 Trevisan, M.; et al, Analysis of old very metal rich stars in the solar neighbourhood, Astronomy & Astrophysics, November 2011, 535: A42, Bibcode:2011A&A...535A..42T, arXiv:1109.6304可免费查阅, doi:10.1051/0004-6361/201016056 . See table 13.
  4. ^ 4.0 4.1 Butler, R. P.; et al. Catalog of Nearby Exoplanets. The Astrophysical Journal. 2006, 646 (1): 505–522 [2012-11-22]. Bibcode:2006ApJ...646..505B. arXiv:astro-ph/0607493可免费查阅. doi:10.1086/504701. (原始内容存档于2009-05-02). 
  5. ^ Mayor, M.; et al. The CORALIE survey for southern extra-solar planets XII. Orbital solutions for 16 extra-solar planets discovered with CORALIE. Astronomy and Astrophysics. 2004, 415 (1): 391–402 [2012-11-22]. Bibcode:2004A&A...415..391M. arXiv:astro-ph/0310316可免费查阅. doi:10.1051/0004-6361:20034250. (原始内容存档于2019-06-16). 
  6. ^ 6.0 6.1 The Harsh Destiny of a Planet?. eso0118 Science Release. European Southern Observatory. 9 May 2001 [15 July 2008]. (原始内容存档于2020-09-21). 
  7. ^ 7.0 7.1 7.2 7.3 Lee, Man Hoi; et al. On the 2:1 Orbital Resonance in the HD 82943 Planetary System. The Astrophysical Journal. 2006, 641 (2): 1178–1187. Bibcode:2006ApJ...641.1178L. arXiv:astro-ph/0512551可免费查阅. doi:10.1086/500566. 
  8. ^ Exoplanets Galore!. eso0019 Science Release. European Southern Observatory. 15 April 2000 [8 August 2009]. (原始内容存档于2011-09-08). 

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