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HD 12661

HD 12661

HD 12661行星系轨道示意图
观测资料
历元 J2000
星座 白羊座
星官
赤经 02h 04m 34.28834s[1]
赤纬 +25° 24′ 51.5031″[1]
视星等(V) 7.42[2]
特性
光谱分类G6 V[3]
U−B 色指数+0.33[2]
B−V 色指数+0.71[2]
天体测定
自行 (μ) 赤经:-107.12[1] mas/yr
赤纬:-174.69[1] mas/yr
视差 (π)28.61 ± 0.61[1] mas
距离114 ± 2 ly
(35.0 ± 0.7 pc)
绝对星等 (MV)4.58[3]
详细资料
质量1.07[3]–1.10[4] M
半径1.096[3]–1.12[4] R
表面重力 (log g)4.43[3]
亮度1.22[4] L
温度5,754[3] K
金属量 [Fe/H]0.29 ± 0.05[3] dex
自转速度 (v sin i)1.20[4] km/s
年龄7.17[5] Gyr
其他命名
BD+24 298, HIP 9683, SAO 75125.[6]
参考数据库
SIMBAD资料
资料来源:
依巴谷星表CCDM (2002)、亮星星表

HD 12661是一颗位于白羊座黄矮星,它的质量和体积稍高于太阳。它的年龄约70亿年,已知有两颗系外行星存在。

恒星状态

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HD 12661的视星等是7.42[2],必须以口径6公分以上望远镜观测[7]视差方式量测它和地球的距离是114光年(35秒差距),误差范围是±2光年[1]。它的光谱类型是G6 V,属于核心正在进行氢融合的主序星。它的表面有效温度大约5,754 K[3],因此是属于呈黄色的G型恒星[8]。根据恒星结构模型,它的半径大约是太阳的107%到112%,质量则大约是太阳的107%到110%[3][4]

恒星年龄越大,它的自转速度会逐渐降低,并且在色球中的磁场强度也会下降。因此量测来自色球的发射线可以量测恒星的年龄,尤其是年龄少于20亿年的光谱类型F和G型的主序星。不过这个技术对于年龄56亿年以上恒星时精确度较差。基于来自色球的发射线量测,HD 12661年龄比太阳老,约70亿年[9]。它的投影自转速度是相当低的1.20 km/s,代表它是一颗较老的恒[4]。天文学家同时也使用在恒星核心内核聚变时会被摧毁的元素锂的含量来测定年龄,但它的精确度较差;锂含量测定的结果大约是44亿年[9]

在天文学上氢和氦以外的元素都称为金属,而HD 12661的金属量异常地高于太阳。高金属量恒星已被发现和拥有多颗行星的行星系有统计上的相关性[3]。这可能是因为系统中有行星离开了轨道,最后遭到恒星吞噬,使恒星表面金属量偏高[10]

行星系统

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该恒星旁于2001年由利克天文台和凯克天文台以精准的径向速度变化量测发现第一颗系外行星。径向速度的周期性变化让天文学家可以此测定行星的轨道周期和质量下限[3]。第二颗行星则是相同团队在2年后发现[11],两颗行星的质量都高于木星[12]

这个系统在动力学上是不稳定的[13][14]。这个系统是在相对罕见的状态下存在或者有另一颗未知的行星影响了径向速度观测值,使已观测到的行星轨道离心率演化[10]

HD 12661的行星系[12]
成员
(依恒星距离)
质量 半长轴
(AU)
轨道周期
()
离心率 倾角 半径
b >2.30 ± 0.19 MJ 0.831 ± 0.048 262.709 ± 0.083 0.3768 ± 0.0077
c >1.92 ± 0.16 MJ 2.90 ± 0.17 1708 ± 14 0.031 ± 0.022

参见

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参考资料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 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. ^ 2.0 2.1 2.2 2.3 Giclas, H. L.; Burnham, R.; Thomas, N. G., Lowell proper motion survey Northern Hemisphere. The G numbered stars. 8991 stars fainter than magnitude 8 with motions > 0".26/year, Flagstaff, Arizona: Lowell Observatory, 1971, Bibcode:1971lpms.book.....G 
  3. ^ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 Fischer, Debra A.; et al, Planetary Companions to HD 12661, HD 92788, and HD 38529 and Variations in Keplerian Residuals of Extrasolar Planets, The Astrophysical Journal, 2001, 551 (2): 1107–1118, Bibcode:2001ApJ...551.1107F, doi:10.1086/320224 
  4. ^ 4.0 4.1 4.2 4.3 4.4 4.5 Fischer, Debra A.; Valenti, Jeff, The Planet-Metallicity Correlation, The Astrophysical Journal, April 2005, 622 (2): 1102–1117, Bibcode:2005ApJ...622.1102F, doi:10.1086/428383 
  5. ^ Koriski, Shuki; Zucker, Shay, On the Ages of Planetary Systems with Mean-motion Resonances, The Astrophysical Journal Letters, November 2011, 741 (1): L23, Bibcode:2011ApJ...741L..23K, arXiv:1109.6671可免费查阅, doi:10.1088/2041-8205/741/1/L23 
  6. ^ G 72-54 -- High proper-motion Star, SIMBAD (Centre de Données astronomiques de Strasbourg), [2012-09-09], (原始内容存档于2020-11-18) 
  7. ^ Sherrod, P. Clay; Koed, Thomas L., A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications: 9, 2003 [2012-09-09], ISBN 0-486-42820-6, (原始内容存档于2014-01-04) 
  8. ^ The Colour of Stars, Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004 [2012-01-16], (原始内容存档于2012-03-10) 
  9. ^ 9.0 9.1 Saffe, C.; Gómez, M.; Chavero, C., On the ages of exoplanet host stars, Astronomy and Astrophysics, November 2005, 443 (2): 609–626, Bibcode:2005A&A...443..609S, arXiv:astro-ph/0510092可免费查阅, doi:10.1051/0004-6361:20053452 
  10. ^ 10.0 10.1 Veras, Dimitri; Ford, Eric B. Secular evolution of HD 12661: a system caught at an unlikely time. The Astrophysical Journal. 2008, 690: L1–L4. Bibcode:2009ApJ...690L...1V. arXiv:0811.0001v1可免费查阅. doi:10.1088/0004-637X/690/1/L1. 
  11. ^ Fischer, Debra A.; et al. A Planetary Companion to HD 40979 and Additional Planets Orbiting HD 12661 and HD 38529. The Astrophysical Journal. 2003, 586 (2): 1394–1408. Bibcode:2003ApJ...586.1394F. doi:10.1086/367889. 
  12. ^ 12.0 12.1 Wright, J. T.; et al. Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems. The Astrophysical Journal (abstract). 2009, 693 (2): 1084–1099. Bibcode:2009ApJ...693.1084W. arXiv:0812.1582可免费查阅. doi:10.1088/0004-637X/693/2/1084. 
  13. ^ Gozdziewski, K. Stability of the HD 12661 Planetary System. Astronomy and Astrophysics. 2003, 398 (3): 1151–1161. Bibcode:2003A&A...398.1151G. doi:10.1051/0004-6361:20021713. 
  14. ^ Rodríguez, Adrián; Gallardo, Tabaré. The Dynamics of the HD 12661 Extrasolar Planetary System. The Astrophysical Journal. 2005, 628 (2): 1006–11013. Bibcode:2005ApJ...628.1006R. doi:10.1086/430816. 

外部链接

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HD 12661
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