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LHS 1140 b

LHS 1140 b
Artist's impression of the planet LHS 1140 b and its host star
发现
发现者MEarth计划(The MEarth Project)
发现日期20 April 2017
凌日时间变分法
轨道参数
半长轴0.0875 (± 0.0041) AU
离心率<0.29
轨道周期24.7369148+0.0000058
d[1]
轨道倾角89.912 (± 0.071)
物理特征
平均半径1.641+0.048
R🜨[2]
质量6.48+0.46
M🜨[2]
平均密度7.82+0.98
−0.88
g/cm3
表面重力2.41 g
温度254 K(−19 °C;−2 °F)

LHS 1140b是一颗位于鲸鱼座超级地球,围绕红矮星LHS 1140运行,距离地球40光年

如何发现

LHS 1140b 是由MEarth计划发现的,这使用了高精度径向速度行星搜索器(HARPS) 进行的多普勒光谱观测,而证实了它的存在。

特征

主星

LHS 1140b 距离主星LHS 1140 1309 万公里(0.09个天文单位)运行,它以大约 25 天的周期公转。主星距离只有太阳地球距离的8%,但由于LHS 1140 只是一颗质量和半径比太阳小15%的小红矮星,[3]所以热量和能量由 LHS 1140b 接收到的,只是大约是地球接收到的阳光量的一半。

质量和半径


↑ 上方是地球和LHS 1140 b 的大小比较。


LHS 1140 b质量约为地球的6.7±1.8倍,半径约为地球的1.4±0.1倍[4][5]。它的质量比地球还大。因此,LHS 1140b很可能是超级地球(Super Earth)。 由于相对于质量半径小,密度高,所以表面的重力是地球的三倍以上。相信自诞生以来已经过去了超过50亿年。

温度

LHS 1140 b表面温度为230 K(-43°C)。由于主星LHS 1140不是活跃的恒星,因此不受强辐射的影响。因此,如果有大气产生温室效应,液态水和生命的存在是可能的。

大气

LHS 1140b 是一颗距离相对较短的行星,距离地球约 40 光年。此外,还能观测到行星在恒星前方经过的凌日,有可能得到行星的大气成分。未来还会计划用哈勃太空望远镜观测 LHS 1140b 。

估算 LHS 1140b的地表温度[6]
条件 地球 LHS 1140b
球面反照率 0.3 0.9 0.6 0.3
没有温室效应 -17℃ -149℃ -98℃ -72℃
+地球的温室效应 15℃ -117℃ -66℃ -40℃

参考资料

  1. ^ Hubble WFC3 Spectroscopy of the Habitable-zone Super-Earth LHS 1140 b, 2020, arXiv:2011.08815可免费查阅 
  2. ^ 2.0 2.1 Planetary system LHS 1140 revisited with ESPRESSO and TESS, 2020, arXiv:2010.06928可免费查阅 
  3. ^ Dickinson, David. Welcome to LHS 1140b: A Super-Earth in the Habitable Zone. Sky & Telescope. 2017-04-19 [2017-04-19]. (原始内容存档于2018-09-08). 
  4. ^ Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Bonfils, Xavier; Astudillo-Defru, Nicola; Haywood, Raphaëlle D.; Berta-Thompson, Zachory K.; Newton, Elisabeth R.; Rodriguez, Joseph E.; Winters, Jennifer G.; Tan, Thiam-Guan; Almenara, Jose-Manuel; Bouchy, François; Delfosse, Xavier; Forveille, Thierry; Lovis, Christophe; Murgas, Felipe; Pepe, Francesco; Santos, Nuno C.; Udry, Stephane; Wünsche, Anaël; Esquerdo, Gilbert A.; Latham, David W.; Dressing, Courtney D. A temperate rocky super-Earth transiting a nearby cool star. Nature. 2017, 544 (7650): 333. doi:10.1038/nature22055. 
  5. ^ Overbye, Dennis. A New Exoplanet May Be Most Promising Yet in Search for Life. New York Times. 2017-04-19 [2017-04-20]. (原始内容存档于2020-11-11). 
  6. ^ HEC: Exoplanets Calculator Planetary Habitability Laboratory页面存档备份,存于互联网档案馆) Planet Equilibrium Temperature
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LHS 1140 b
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