Analysis of the exoplanet containing system Kepler-91
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- 作者：E. Budding ; 脟. P眉sk眉ll眉 ; M. D. Rhodes ; O. Demircan…
- 关键词：Stars ; close binary ; Stellar dynamics ; Exoplanets ; Light curve analysis
- 刊名：Astrophysics and Space Science
- 出版年：2016
- 出版时间：January 2016
- 年：2016
- 卷：361
- 期：1
- 全文大小：1,196 KB
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脟. P眉sk眉ll眉 (1)
M. D. Rhodes (5)
O. Demircan (1)
A. Erdem (1)
1. University of Canakkale, Canakkale, 17020, Turkey
2. Carter Observatory, Wellington, New Zealand
3. SCPS, Victoria University of Wellington, Wellington, New Zealand
4. Dept. Physics & Astronomy, UoC, Christchurch, New Zealand
5. BYU, Provo, Utah, USA - 刊物类别：Physics and Astronomy
- 刊物主题：Physics
Astronomy - 出版者：Springer Netherlands
- ISSN：1572-946X
文摘
We have applied the graphical user interfaced close binary system analysis program WinFitter to an intensive study of Kepler-91 using all the available photometry from the NASA Exoplanet Archive (NEA) at the Caltech website: http://鈥媏xoplanetarchive鈥?鈥媔pac.鈥媍altech.鈥媏du. Our fitting function for the tidal distortion derives from the relevant Radau equation and includes terms up to the fifth power of the fractional radius. This results in a systematic improvement in the mass ratio estimation over that of Lillo-Box et al. (Astron. Astrophys. 562:A109, 2014a) and our derived value for the mass ratio is in close agreement with that inferred from recent high-resolution spectroscopic data. It is clear that the data analysis in terms of simply an eclipsing binary system is compromised by the presence of significant other causes of light variation, in particular non-radial pulsations. We apply a low-frequency filtering procedure to separate out some of this additional light variation. Whilst the derived eccentricity appears then reduced, an eccentric effect remains in the light curve. We consider how this may be maintained in spite of likely frictional effects operating over a long time. There are also indications that could be associated with Trojan or other period-resonant mass concentrations. Suggestions of a possible secular period variation are briefly discussed. Keywords Stars: close binary Stellar dynamics Exoplanets Light curve analysis