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天苑四b

天苑四b
波江座ε星b的艺术想象图
发现
发现者Hatzes et al.
发现地Tucson, Arizona, USA
发现日期2000
径向速度
轨道参数
近astron1.01 AU
远astron5.77 AU
半长轴3.39 ± 0.36 AU
离心率0.702 ± 0.039
轨道周期2502 ± 10 d
平均轨道速度12.47 km/s
轨道倾角30.1 ± 3.8°
角距离1059.375 mas
近心点经度34°
近心点时间54207 ± 7 JD
半振幅18.6 ± 2.9 m/s
物理特征
质量1.55 ± 0.24 MJ

波江座ε星b,也被称为天苑四b,行星编号为HD 22049b,是一颗位于波江座、距离地球约10光年的系外行星。其母星为天苑四,该行星的发现使天苑四系统在2012年10月半人马座α Bb被发现以前是距离太阳系最近的行星系。

发现

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1990年代初,由布鲁斯·坎贝尔(Bruce Campbell)和戈登·沃克(Gordon Walker)领导的一支加拿大团队已经猜测该行星可能存在,但是他们的观测结果并不具有权威性。及至2000年8月7日,由阿蒂·海泽斯领导的团队宣布发现了该行星,观测结果显示其质量为1.2 ± 0.33倍木星质量,轨道距离其母星3.4天文单位[1] 。科学家认为其轨道离心率较高[2](如本尼迪克最近一次估计认为其离心率高达0.702)。杰佛瑞·马西等人认为需要获得更多的由其大型的、可变的磁场引起的多普勒噪音以进一步确定其存在[3],故在哈勃空间望远镜的观测确定其存在之前,该行星的存在仍然富有争议性。

特性

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科学家估计该行星的质量为木星质量的1.5倍,其轨道与地球观测视线的倾角为30°,且与其母星四周环绕的尘埃环位于同一平面上[4]

参见

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参考资料

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  1. ^ Hatzes, Artie P.; Cochran, William D.; McArthur, Barbara; Baliunas, Sallie L.; Walker, Gordon A. H.; Campbell, Bruce; Irwin, Alan W.; Yang, Stephenson; Kürster, Martin; Endl, Michael; Els, Sebastian; Butler, R. Paul; Marcy, Geoffrey W. Evidence for a Long-Period Planet Orbiting ε Eridani. The Astrophysical Journal. 2000, 544 (2): L145–L148. Bibcode:2000ApJ...544L.145H. arXiv:astro-ph/0009423可免费查阅. doi:10.1086/317319. 
  2. ^ Butler; et al. Catalog of Nearby Exoplanets. The Astrophysical Journal. 2006, 646 (1): 505–522. Bibcode:2006ApJ...646..505B. arXiv:astro-ph/0607493可免费查阅. doi:10.1086/504701. 
  3. ^ Marcy, Geoffrey W.; et al. Planetary Messages in the Doppler Residuals (Invited Review). A. Penny (编). Planetary Systems in the Universe, Proceedings of IAU Symposium #202. Manchester, United Kingdom: 20–28. August 7–11, 2000. Bibcode:2004IAUS..202...20M. 
  4. ^ Benedict; McArthur, Barbara E.; Gatewood, George; Nelan, Edmund; Cochran, William D.; Hatzes, Artie; Endl, Michael; Wittenmyer, Robert; Baliunas, Sallie L.; et al. The Extrasolar Planet ε Eridani b: Orbit and Mass. The Astronomical Journal. 2006, 132 (5): 2206–2218 [2008-11-16]. Bibcode:2006AJ....132.2206B. arXiv:astro-ph/0610247可免费查阅. doi:10.1086/508323. (原始内容存档于2019-12-09). 
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天苑四b
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