Dynamical constraints on the quadrupole mass moment of the HD 209458 star
Abstract
The aim of this paper is to dynamically constrain the quadrupole mass moment J2 of the main-sequence HD 209458 star. The adopted method is the confrontation between the measured orbital period of its transiting planet Osiris and a model of it. Osiris is assumed to move along an equatorial and circular orbit. Our estimate, for given values of the stellar mass M and radius R and by assuming the validity of general relativity, is J2=(3.5 +/- 385.1) 10-5. Previous fiducial evaluations based on indirect, spectroscopic measurements yielded J2 10-6: such a value is compatible with our result.
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