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格利泽317

葛利泽317(Gliese 317)
观测资料
历元 J2000.0
星座 罗盘座
星官
赤经 08h 40m 59.24s
赤纬 -23° 27′ 23.3″
视星等(V) 11.98
特性
光谱分类M2.5V
变星类型none reported
天体测定
径向速度 (Rv)87.8[1] km/s
自行 (μ) 赤经:-438 mas/yr
赤纬:794 mas/yr
视差 (π)65.3 ± 0.5[1] mas
距离15.3 pc
其他命名
GJ 317, LFT 538, LHS 2037, LPM 296, LTT 3215
详细资料
质量0.43 [1] M
金属量 [Fe/H]+0.3[1][2] dex
参考数据库
SIMBAD资料
系外行星数据库英语Exoplanet Archive资料
系外行星百科资料

葛利泽317Gliese 317)是一个距离地球约50光年的红矮星,位于罗盘座。2011年确认该恒星旁有两颗系外行星[3][1]。测光校正和红外线光谱量测[2]指出该恒星和太阳相较之下有大量重元素。

行星系统

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2007年宣布有一颗气态巨行星格利泽317b)环绕该恒星[3]。该行星距离母恒星相当于日地距离的95%。但因为母恒星是低质量的红矮星,轨道周期是1.9年。葛利泽317进一步的天体测量将它和地球之间的距离修正为15.3秒差距,比原先量测距离多了65%[1]。使用质量光度关系校正后,新的距离显示该恒星和它的行星候选天体的质量较原本量测值高。相同的天文测量也更进一步限制行星轨道倾角范围,并且该行星质量上限是木星质量2.5倍(98%信心水准)。

系统中的第二颗行星是由附加的新的径向速度量测发现,但是葛利泽317c的轨道周期(超过2000日)和轨道参数至今仍不明[1]。对这个假定系统的稳定性分析显示,这两颗系外型星必须在比例4:1的轨道共振状态下才会处于稳定状态[4]

行星系统

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格利泽317的行星系[1]
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 >1.81 ± 0.05 MJ 1.148 692.0 ± 2 0.11 ± 0.05
c (未确认) ~2.0 MJ ~10-40 >10 000 unknown

参见

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参见

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  1. ^ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 Anglada-Escude, G.; et al, Astrometry and radial velocities of the planet host M dwarf GJ 317: new trigonometric distance, metallicity and upper limit to the mass of GJ 317b, The Astrophysical Journal, 2012, 764 (1): 37A, arXiv:1111.2623可免费查阅 
  2. ^ 2.0 2.1 Terrien, Ryan C.; et al, "An H-band Spectroscopic Metallicity Calibration for M Dwarfs", arXiv:1202.1800可免费查阅 
  3. ^ 3.0 3.1 Johnson, J. A.; Butler, R. Paul; Marcy, Geoffrey W.; Fischer, Debra A.; Vogt, Steven S.; Wright, Jason T.; Peek, Kathryn M. G., A New Planet Around an M Dwarf: Revealing a Correlation between Exoplanets and Stellar Mass, The Astrophysical Journal, 2007, 670 (1): 833–840, Bibcode:2007ApJ...670..833J, arXiv:0707.2409可免费查阅, doi:10.1086/521720 
  4. ^ Rory Barnes; Richard Greenberg. Extrasolar Planet Interactions. 2008. arXiv:0801.3226v1可免费查阅 [astro-ph]. 

外部链接

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格利泽317
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