期刊
ASTROPHYSICAL JOURNAL
卷 661, 期 2, 页码 L195-L198出版社
IOP PUBLISHING LTD
DOI: 10.1086/519002
关键词
infrared : stars; stars : fundamental parameters; stars : individual (HD 189733); techniques : interferometric
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 circle dot 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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