Dynamical constraints on the quadrupole mass moment of the HD 209458 star

Details Dynamical constraints on the quadrupole mass moment of the HD 209458 star Dynamical constraints on the quadrupole mass moment of the HD 209458 star

2006-09-25

arxiv.org/abs/gr-qc/0609112v3

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTex, 6 pages, no figures, 1 table, 21 references. One table and one reference added. Metadata updated

Scientific paper

The aim of this paper is to dynamically constrain the quadrupole mass moment J_2 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 J_2=(3.5 +/- 385.1) 10^-5. Previous fiducial evaluations based on indirect, spectroscopic measurements yielded J_2\sim 10^-6: such a value is compatible with our result.

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