ABSOLUTE DIMENSIONS OF A FLAT HIERARCHICAL TRIPLE SYSTEM KIC 6543674 FROM THE KEPLER PHOTOMETRY
ABSOLUTE DIMENSIONS OF A FLAT HIERARCHICAL TRIPLE SYSTEM KIC 6543674 FROM THE KEPLER PHOTOMETRY
复制标题
DOI：
10.1088/2041-8205/806/2/l37
复制
发表时间：
2015-06
期刊：
影响因子：
--
通讯作者：
K. Masuda;S. Uehara;H. Kawahara
中科院分区：
文献类型：
--
作者：
K. Masuda;S. Uehara;H. Kawahara
许多开普勒近距离双星被认为是通过它们的食时变化（ETV）构成了等级三元系统。如果观测到这些系统中的第三个物体的运动，就能对其物理和轨道特性提供精确的限制，否则很难获得这些限制。在这封信中，我们分析了这样一个“三级事件”只观察到一次在KIC 6543674系统。该系统包括一个短期（2.4天？）内食双星和第三个天体在宽（1100天？>）和偏心（e ≥ 0.6？>）轨道。对围绕第三天体一次下合的三次第三次食的分析，得出内外双星面的交角为33 ± 06？表示非常平坦的几何形状。此外，结合第三次日食的时间和形状与内双星的相位曲线和ETV，我们单独使用开普勒测光确定系统中所有三个天体的质量和半径比。利用开普勒输入星表中的原始质量和温度，得到了这三颗恒星的绝对质量、半径和有效温度：M A = 1.2 ± 0.3 M？>，R A = 1.8 ± 0.1 R？，M B = 1.1 − 0.2 + 0.3 M？？>，R B = 1.4 ± 0.1 R？>，M C = 0.50 − 0.08 + 0.07 M？>，R C = 0.50 ± 0.04 R？，T A T B 6100 K？>和T C .简要讨论了密近双星的形成情景的含义。
Many of the Kepler close binaries are suggested to constitute hierarchical triple systems through their eclipse timing variations (ETVs). Eclipses by the third body in those systems, if observed, provide precise constraints on its physical and orbital properties, which are otherwise difficult to obtain. In this Letter, we analyze such a “tertiary event” observed only once in the KIC 6543674 system. The system consists of a short-period ( 2.4 days ?> ) inner eclipsing binary and a third body on a wide ( 1100 days ?> ) and eccentric ( e ≃ 0.6 ?> ) orbit. Analysis of three tertiary eclipses around a single inferior conjunction of the third body yields the mutual inclination between the inner and outer binary planes to be 3 3 ± 0 6 ?> , indicating an extremely flat geometry. Furthermore, combining the timings and shapes of the tertiary eclipses with the phase curve and ETVs of the inner binary, we determine the mass and radius ratios of all three bodies in the system using the Kepler photometry alone. With the primary mass and temperature from the Kepler Input Catalog, the absolute masses, radii, and effective temperatures of the three stars are obtained as follows: M A = 1.2 ± 0.3 M ⊙ ?> , R A = 1.8 ± 0.1 R ⊙ ?> , M B = 1.1 − 0.2 + 0.3 M ⊙ ?> , R B = 1.4 ± 0.1 R ⊙ ?> , M C = 0.50 − 0.08 + 0.07 M ⊙ ?> , R C = 0.50 ± 0.04 R ⊙ ?> , T A ≃ T B ≃ 6100 K ?> , and T C . Implication for the formation scenario of close binaries is briefly discussed.