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Direct Measurement of the Radius and Density of the Transiting Exoplanet HD 189733B with the CHARA Array
- Publication Year :
- 2007
-
Abstract
- We have measured the angular diameter of the transiting extrasolar planet host star HD 189733 using the CHARA O/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 Rsol and a radius for the planet of 1.19+/-0.08 RJup. 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.<br />Comment: 14 pages, 5 figures, to be published in Astrophysical Journal Letters
- Subjects :
- Astrophysics
Subjects
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.0704.3722
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1086/519002