山案座π

山案座π
Pi Mensae
觀測資料
曆元 J2000.0
星座 山案座
星官
赤經 05h 37m 09.89s [1]
赤緯 –80° 28′ 08.8″ [1]
視星等(V) +5.65[2]
特性
光谱分类G0 V[3]
U−B 色指数0.11[2]
B−V 色指数0.60[2]
V−R 色指数0.31
R−I 色指数0.29
变星类型none
天体测定
徑向速度 (Rv)+10.9[4] km/s
自行 (μ) 赤经:312.01±0.24[1] mas/yr
赤纬:1,050.38±0.26[1] mas/yr
视差 (π)54.60 ± 0.21[1] mas
距离59.7 ± 0.2 ly
(18.32 ± 0.07 pc)
绝对星等 (MV)+4.35±0.01[5]
詳細資料 [6]
質量1.11±0.01 M
半徑1.15±0.01 R
表面重力 (log g)4.35±0.01
亮度1.532±0.004 L
溫度6,013±18 K
金属量 [Fe/H]0.09[7] dex
自轉速度 (v sin i)2.96[7] km/s
年齡3.4±0.6 Gyr
其他命名
CD-80°195, CP(D)-80°161, LTT 2359, LFT 429, LHS 208, HR 2022, HD 39091, HIP 26394, SAO 258421, GJ 9189.

山案座πPi Mensae,π Men)是一個位於山案座黃矮星[3],有相當高的自行。山案座π的視星等5.65,可在晴朗和極黑暗的夜空中以肉眼觀測,距離地球約60光年。該恆星的質量、體積、光度、表面溫度和金屬量都較太陽高,並且較太陽年輕7.3億年。山案座π在已取消的類地行星發現者最優先100顆搜尋行星的恆星中第100個。該恆星周圍已發現2顆系外行星。

行星系統

2001年10月15日在山案座π旁發現一顆太陽系外行星山案座πb[8]。這顆行星是目前發現的系外行星中質量最高之一。它的軌道離心率相當高,公轉週期約2151日(5.89年)。因為它的高軌道離心率,並且是會通過恆星適居帶的超級木星,可能會使假設存在的任何類似地球行星軌道受到擾動,並且使這些類地行星被推入恆星中或拋出行星系統。

結合更精確的依巴谷卫星觀測資料,天文學家計算山案座πb的質量大約10.27至29.9倍木星質量之間,證實了它的亞恆星天體特性,其質量上限在棕矮星的範圍之內[9]

2018年9月16日,arXiv上刊登的预印本論文宣稱在山案座π周圍發現另一顆軌道周期6.27日的超級地球,這篇提交出版的論文內容是凌日系外行星巡天衛星發現的第一顆系外行星[10]

山案座π的行星系[11]
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 4.82 ± 0.85 M 0.06839 ± 0.00050 6.2682 ± 0.00024 0 87.27 ± 0.07° 2.14 ± 0.044 R
d
b ≥10.27 ± 0.84 MJ 3.38 ± 0.22 2151 ± 85 0.6405 ± 0.0072

參見

參考資料

  1. ^ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. HIP 26394. Hipparcos, the New Reduction. 2007 [2010-02-28]. (原始内容存档于2012-07-26). 
  2. ^ 2.0 2.1 2.2 Johnson, H. L.; et al. UBVRIJKL photometry of the bright stars. Communications of the Lunar and Planetary Laboratory. 1966, 4 (99). Bibcode:1966CoLPL...4...99J. 
  3. ^ 3.0 3.1 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. 
  4. ^ Valenti, Jeff A.; Fischer, Debra A. Spectroscopic Properties of Cool Stars (SPOCS). I. 1040 F, G, and K Dwarfs from Keck, Lick, and AAT Planet Search Programs. The Astrophysical Journal Supplement Series. July 2005, 159 (1): 141–166. Bibcode:2005ApJS..159..141V. doi:10.1086/430500. 
  5. ^ Holmberg, J.; et al, The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics, Astronomy and Astrophysics, July 2009, 501 (3): 941–947, Bibcode:2009A&A...501..941H, arXiv:0811.3982可免费查阅, doi:10.1051/0004-6361/200811191. 
  6. ^ Bonfanti, A.; et al. Revising the ages of planet-hosting stars. Astronomy and Astrophysics. 2015, 575. A18 [2018-09-27]. Bibcode:2015A&A...575A..18B. arXiv:1411.4302可免费查阅. doi:10.1051/0004-6361/201424951. (原始内容存档于2019-12-07). 
  7. ^ 7.0 7.1 Delgado Mena, E.; et al, Li abundances in F stars: planets, rotation, and Galactic evolution, Astronomy & Astrophysics, April 2015, 576: 24, Bibcode:2015A&A...576A..69D, arXiv:1412.4618可免费查阅, doi:10.1051/0004-6361/201425433, A69. 
  8. ^ Jones; et al. A probable planetary companion to HD 39091 from Anglo-Australian Planet Search. Monthly Notices of the Royal Astronomical Society. 2002, 333 (4): 871–875. Bibcode:2002MNRAS.333..871J. arXiv:astro-ph/0112084可免费查阅. doi:10.1046/j.1365-8711.2002.05459.x.  (web Preprint)
  9. ^ Reffert, S.; Quirrenbach, A. Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs. Astronomy & Astrophysics. 2011, 527. id.A140. Bibcode:2011A&A...527A.140R. arXiv:1101.2227可免费查阅. doi:10.1051/0004-6361/201015861. 
  10. ^ Huang; et al. TESS Discovery of a Transiting Super-Earth in the Π Mensae System. The Astrophysical Journal Letters. 2018. arXiv:1809.05967v1可免费查阅. 
  11. ^ Butler; et al. Catalog of Nearby Exoplanets. The Astrophysical Journal. 2006, 646 (1): 505–522 [2012-06-24]. Bibcode:2006ApJ...646..505B. arXiv:astro-ph/0607493可免费查阅. doi:10.1086/504701. (原始内容存档于2020-06-12). 

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