THE KEPLER ECLIPSING SYSTEM KIC 5621294 AND ITS SUBSTELLAR COMPANION

摘要: We present the physical properties of KIC 5621294, showing light and timing variations from Kepler photometry. Its curve displays partial eclipses O?Connell effect, with Max II fainter than I, which was fitted quite well by applying third-body spot effects to system. The results indicate that eclipsing pair is a classical Algol-type system parameters q = 0.22, i 76.?8, ?(T1?T2) 4235 K, in detached primary component fills about 77% its limiting lobe. Striking discrepancies exist between secondary eclipse times obtained method Kwee & van Woerden. These are mainly caused surface inhomogeneities due activity detected our synthesis. 1253 timings Wilson?Devinney code were used for period study. It found orbital 5621294 has varied periodic variation overlaid on downward parabola. sinusoidal 961 days semi-amplitude 22.5 s most likely arises light-time effect third mass 46.9 MJup, good agreement calculated itself. If inclination larger 40?, circumbinary object would possibly match brown dwarf. parabolic could not be fully explained either transfer binary components or angular momentum via magnetic braking. possible parabola may only observed part modulation presence another companion wider orbit.