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柯洛2b

柯洛2b
发现
發現者柯洛计划
發現日期2007年12月
凌星测量法
軌道參數
半長軸0.0281 ± 0.0005[1][2]
離心率0(预测)[1]
軌道週期1.7429964 ± 0.0000017地球日[1]
物理特徵
平均半徑1.429 ± 0.047倍木星半径[1]
質量3.31 ± 0.16倍木星质量[1]
平均密度1310 ± 40千克/立方米[1]
表面重力38.2m/s2[3]
溫度1537 ± 35K[1]

柯洛2b(也被称为柯洛-系外行星-2b[4])是法国所主持的柯洛计划发现的第二颗系外行星,该行星位于巨蛇座,距离地球930光年,其母星为柯洛2。科学家于2007年12月20日对外宣布发现该行星。[5]

柯洛2b是一颗大型热木星,其半径为木星半径的1.43倍,质量约为木星的3.3倍。由于距离母星较近,该行星表面被加热至一个极高的温度,其外层大气急剧膨胀,从而使其体积变得很大。该行星较大的半径表明柯洛2b表面已达到了较高的温度,估计约为1500K,高于原本预计的处于该距离的行星的表面温度。如果它与中央恒星的距离和木星与太阳的距离相仿,则其半径也将与木星大致相同。这表明可能存在另一颗行星与柯洛2b相互作用并产生潮汐热。[6]

该行星的轨道周期约为1.7地球日,运行于靠近中央恒星赤道面的顺行轨道上。[7]中央恒星是一颗G型恒星,温度稍低于太阳,但是显得更加活跃。

轨道

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2008年8月,鲍奇等人通过罗斯特-麦克劳克林效应计算出柯洛2b的自旋轨道角(即中央恒星赤道面与行星轨道面的交角)约为+7.2±4.5°。[8]

参考文献

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Alonso; et al. Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an active G star. Astronomy and Astrophysics. 2008, 482 (3): L21–L24. doi:10.1051/0004-6361:200809431. 
  2. ^ The paper gives the semimajor axis as 6.70 ± 0.03 times the radius of the star, which is estimated at 0.902 ± 0.018 solar radii.
  3. ^ Calculated using Newtonian gravity:
  4. ^ Schneider, J. Change in CoRoT planets names. Exoplanets (邮件列表). 2009-03-10 [2009-03-19]. (原始内容存档于2010-01-18). 
  5. ^ COROT surprises a year after launch. [2007-12-21]. (原始内容存档于2012-04-14). 
  6. ^ CoRoT-exo-2 c?. [2007-12-21]. (原始内容存档于2012-04-14). 
  7. ^ Bouchy; et al. Transiting exoplanets from the CoRoT space mission. III. The spectroscopic transit of CoRoT-Exo-2b with SOPHIE and HARPS. Astronomy and Astrophysics. 2008, 482 (3): L25–L28. doi:10.1051/0004-6361:200809433. 
  8. ^ Bouchy; et al. A&A. 2008, 482: L25.  缺少或|title=为空 (帮助)

外部链接

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柯洛2b
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