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金牛座CI

CI Tauri
觀測資料
曆元 J2000
星座 金牛座
星官
赤經 04h 33m 52.01444s[1]
赤緯 +22° 50′ 30.0937″[1]
視星等(V) 13.8[1]
特性
光谱分类K4IVe [1]
变星类型金牛T星
天体测定
徑向速度 (Rv)+16.2[1] km/s
自行 (μ) 赤经:+8.904[1] mas/yr
赤纬:–17.067[1] mas/yr
视差 (π)6.3008 ± 0.473[1] mas
距离520 ± 40 ly
(160 ± 10 pc)
詳細資料
質量0.80 ± 0.02[2] M
年齡.0020[2] Gyr
其他命名
CI Tau, 2MASS J04335200+2250301, EPIC 247584113[1]
參考資料庫
SIMBAD资料

金牛座CICI Tauri)是一顆年齡只有約200萬年的年輕恆星,距離地球約500光年,在天球上位於金牛座。2016年,天文學家在該恆星旁發現一顆行星金牛座CIb(CI Tauri b),並在2018年宣布由恆星周圍的原行星盤內間隙觀測資料,可能發現了另外3顆行星。

金牛座CIb

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金牛座CIb 的發現值得注意,因為該行星是熱木星,一般認為這類恆星要至少1000萬年形成,並且通常被認為無法再太過靠近母恆星的地方形成[3][4]。金牛座CIb質量為木星的12倍,軌道周期9日[2]

2018年發現

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天文學家使用阿塔卡馬大型毫米波/亞毫米波陣列對金牛座CI進行觀測以搜尋金牛座CIb的「兄弟姊妹」,並有一組天文學家發現在周圍的原行星盤內擁有三個明顯的間隙,而他們的理論模型顯示這些間隙是由其他3顆行星造成。3顆中可能存在的行星中,最外側的2顆行星的質量大約相當於土星,內側的質量則大約與金牛座CIb相等[4]。其中兩顆新發現的行星位置與金牛座HL原行星盤中推論的位置相似[5]

如果這項發現得到證實,這將是這個年代所發現太陽系外行星系統中總質量最高的例子,並且行星分布範圍從距離母恆星最近到最遠相差約1000倍[5]

參考資料

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 V* CI Tau -- T Tau-type Star. SIMBAD. [19 October 2018]. (原始内容存档于2018-10-20). 
  2. ^ 2.0 2.1 2.2 CI Tau. Open Exoplanet Catalogue. [20 October 2018]. (原始内容存档于2018-11-25). 
  3. ^ Astronomers find giant planet around very young star CI Tauri. Astronomy Now. [20 October 2018]. (原始内容存档于2018-10-27). 
  4. ^ 4.0 4.1 Giant planets around young star raise questions about how planets form. University of Cambridge. 2018-10-15 [20 October 2018]. (原始内容存档于2018-11-27). 
  5. ^ 5.0 5.1 Clarke, Cathie J; Tazzari, Marco; Juhasz, Attila; Rosotti, Giovanni; Booth, Richard; Facchini, Stefano; Ilee, John D; Johns-Krull, Christopher M; Kama, Mihkel; Meru, Farzana; Prato, Lisa. High resolution millimetre imaging of the CI Tau protoplanetary disc - a massive ensemble of protoplanets from 0.1 - 100 au. The Astrophysical Journal. 2018, 866: L6. arXiv:1809.08147可免费查阅. doi:10.3847/2041-8213/aae36b. 
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金牛座CI
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