We have measured the angular diameter of the transiting extrasolar planet host star HD 189733 using the CHARA optical/IR interferometric array. Combining our new angular diameter of 0.377 ± 0.024 mas with the Hipparcos parallax leads to a linear radius for the host star of 0.779 ± 0.052 R ☉ and a radius for the planet of 1.19 ± 0.08 R Jup . Adopting the mass of the planet as derived by its discoverers, we derive a mean density of the planet of 0.91 ± 0.18 g cm -3 . This is the first determination of the diameter of an extrasolar planet through purely direct means.
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Baines et al. (2007) studied this question.
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