Direct Measurement of the Radius and Density of the Transiting Exoplanet HD 189733B with the CHARA Array
arXiv:0704.3722 · doi:10.1086/519002
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.
14 pages, 5 figures, to be published in Astrophysical Journal Letters
References in corpus (3)
Cited by in corpus (13)
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- Hubble Space Telescope times-series photometry of the planetary transit of HD189733: no moon, no rings, starspots
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- The Transit Light Curve Project. VII. The Not-So-Bloated Exoplanet HAT-P-1b
- CHARA Array Measurements of the Angular Diameters of Exoplanet Host Stars
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- First detection of polarized scattered light from an exoplanetary atmosphere
- A Hubble Space Telescope transit light curve for GJ436b
- Planetpol polarimetry of the exoplanet systems 55 Cnc and tau Boo
- The Visual Orbit of the 1.1-day Spectroscopic Binary σ^2 Coronae Borealis from Interferometry at the CHARA Array
- Looking for Super-Earths in the HD 189733 System: A Search for Transits in Most Space-Based Photometry
- Five New Transits of the Super-Neptune HD 149026
- Closure Phase Signatures of Planet Transit Events