Analysis of the exoplanet containing system Kepler 91
Edwin Budding, \c{C}a\u{g}lar P\"usk\"ull\"u, Michael D. Rhodes, Osman, Demircan, Ahmet Erdem

TL;DR
This study uses advanced modeling techniques to analyze Kepler 91, improving mass ratio estimates and exploring complex light variations caused by pulsations and potential resonances in the system.
Contribution
It introduces a refined analysis method incorporating tidal distortion effects up to the fifth power of fractional radius, enhancing mass ratio accuracy over previous studies.
Findings
Improved mass ratio estimation consistent with spectroscopic data.
Identification of non-radial pulsations affecting light curves.
Evidence suggesting possible Trojan or resonant mass concentrations.
Abstract
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://exoplanetarchive.ipac.caltech.edu . 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 (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…
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