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克卜勒89（Kepler-89，舊稱KOI-94）是已確認擁有四顆太陽系外行星存在的恆星，並且可能是主星與伴星距離甚遠的聯星系統 [1]。
行星系統
天文學家分析克卜勒太空望遠鏡的觀測資料後，於2012年10月宣布發現了克卜勒89的4顆行星[2]。後續的徑向速度量測進一步確認了克卜勒89d的存在，並且觀測資料顯示它的體積和質量稍大於土星[3]。2013年10月其他3顆行星也被確認存在，並且得知了克卜勒89c和e較合理的質量上下限[4]。
2012年時，天文學家宣布觀測到了距離母恆星最遠的行星通過第2遠行星盤面正前方的部分凌星。這是天文學家首次觀測到恆星與地球之間行星互相凌星的現象[5][6]。這允許天文學家得以測定89d和e之間的軌道之間夾角為1.15°[7]。
克卜勒89的行星系
成員
(依恆星距離)
|
质量
|
半長軸
(AU)
|
轨道周期
(天)
|
離心率
|
傾角
|
半径
|
| b
|
<10.5 M⊕
|
0.05
|
3.7
|
—
|
89.3°
|
0.13 RJ
|
| c
|
7.3-11.8 M⊕
|
0.099
|
10.4
|
<0.1
|
88.36°
|
0.31 RJ
|
| d
|
0.33±0.034 MJ
|
0.165
|
22.3
|
<0.1
|
89.871°
|
0.83 RJ
|
| e
|
11.9-15.5 M⊕
|
0.298
|
54.3
|
<0.1
|
89.76°
|
0.49 RJ
|
參考資料
- ^ Takahashi, Yasuhiro H.; Norio Narita; Teruyuki Hirano; Masayuki Kuzuhara; Motohide Tamura; Tomoyuki Kudo; Nobuhiko Kusakabe; Jun Hashimoto; Bun'ei Sato; Lyu Abe; Wolfgang Brandner; Brandt; Carson; Thayne Currie; Sebastian Egner; Markus Feldt; Miwa Goto; Grady; Olivier Guyon; Yutaka Hayano; Masahiko Hayashi; Hayashi; Thomas Henning; Hodapp; Miki Ishii; Masanori Iye; Markus Janson; Ryo Kandori; Knapp; Jungmi Kwon. A Discovery of a Candidate Companion to a Transiting System KOI-94: A Direct Imaging Study for a Possibility of a False Positive. 2013. arXiv:1309.2559
 [EP astro-ph. EP].
- ^ Teruyuki Hirano; Norio Narita; Bun'ei Sato; Takahashi, Yasuhiro H.; Kento Masuda; Yoichi Takeda; Wako Aoki; Motohide Tamura; Yasushi Suto. Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry. 2012. arXiv:1209.4362 [EP astro-ph. EP].
- ^ Weiss, Lauren M.; Marcy, Geoffrey W.; Rowe, Jason F.; Howard, Andrew W.; Isaacson, Howard; Fortney, Jonathan J.; Miller, Neil; Demory, Brice-Olivier; Fischer, Debra A.; Adams, Elisabeth R.; Dupree, Andrea K.; Howell, Steve B.; Kolbl, Rea; Johnson, John Asher; Horch, Elliott P.; Everett, Mark E.; Fabrycky, Daniel C.; Seager, Sara. The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux. The Astrophysical Journal. 2013, 768: 14. arXiv:1303.2150 . doi:10.1088/0004-637X/768/1/14.
- ^ Masuda, Kento; Hirano, Teruyuki; Taruya, Atsushi; Nagasawa, Makiko; Suto, Yasushi. Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse. The Astrophysical Journal. 2013, 778 (2): 185–200. arXiv:1310.5771 . doi:10.1088/0004-637X/778/2/185.
- ^ First ever discovery of planet-planet eclipse | UTokyo Research. u-tokyo.ac.jp. [2014-01-20]. （原始内容存档于2013-11-04）.
- ^ Teruyuki Hirano; Norio Narita; Bun'ei Sato; Takahashi, Yasuhiro H.; Kento Masuda; Yoichi Takeda; Wako Aoki; Motohide Tamura; Yasushi Suto. [1209.4362] Planet-Planet Eclipse and the Rossiter-McLaughlin Effect of a Multiple Transiting System: Joint Analysis of the Subaru Spectroscopy and the Kepler Photometry. 1970. arXiv:1209.4362 [EP astro-ph. EP].
- ^ Masuda, Kento; Hirano, Teruyuki; Taruya, Atsushi; Nagasawa, Makiko; Suto, Yasushi. Characterization of the KOI-94 System with Transit Timing Variation Analysis: Implication for the Planet-Planet Eclipse. The Astrophysical Journal. 2013, 778 (2): 185–200. arXiv:1310.5771v2 . doi:10.1088/0004-637X/778/2/185.
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