Abstract
Continuing work initiated in an earlier publication [Sato and Asada, PASJ, 61, L29 (2009)], we consider light curves influenced by the orbital inclination and eccentricity of a companion in orbit around a transiting extrasolar planet (in a planet-satellite system or a hypothetical true binary). We show that the semimajor axis, eccentricity and inclination angle of a `moon' orbit around the host planet can be determined by transit method alone. For this purpose, we present a formulation for the parameter determinations in a small-eccentricity approximation as well as in the exact form. As a result, the semimajor axis is expressed in terms of observables such as brightness changes, transit durations and intervals in light curves. We discuss also a narrow region of parameters that produce a mutual transit by an extrasolar satellite.
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