ON THE POSSIBILITY OF ESTIMATION OF THE ORBIT ECCENTRICITY OF A BINARY SYSTEM WITH AN EXOPLANET USING A TRANSIT LIGHT CURVE

Working with both simulated and observed transit light curves, we studied a possibility of determining an orbital eccentricity of a binary star system with an exoplanet. It is shown that determining an exact eccentricity value from transit light curves is possible if a longitude of a periastron is known. In the absence of information about the longitude of periastron, analysis of the transit light curve makes it possible to impose restrictions on orbital eccentricity values. The influence of uncertainty in the orbital eccentricity on the accuracy of determination of other parameters of the system (a radius of the star, a radius of the planet, orbit inclination, and limb darkening coefficient) has been studied.