Direct Measurement of the Radius and Density of the Transiting Exoplanet HD 189733b with the CHARA Array
- 9 May 2007
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 661 (2) , L195-L198
- https://doi.org/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.Comment: 14 pages, 5 figures, to be published in Astrophysical Journal LetterKeywords
All Related Versions
This publication has 19 references indexed in Scilit:
- Refined Parameters of the Planet Orbiting HD 189733The Astrophysical Journal, 2006
- A Stellar Companion in the HD 189733 System with a Known Transiting Extrasolar PlanetThe Astrophysical Journal, 2006
- ELODIE metallicity-biased search for transiting Hot JupitersAstronomy & Astrophysics, 2005
- Theoretical isochrones in several photometric systemsAstronomy & Astrophysics, 2002
- TheHipparcosandTychoPhotometric System PassbandsPublications of the Astronomical Society of the Pacific, 2000
- Detection of Planetary Transits Across a Sun-like StarThe Astrophysical Journal, 2000
- The Palomar Testbed InterferometerThe Astrophysical Journal, 1999
- An Interferometric Search for Bright Companions to 51 PegasiThe Astrophysical Journal, 1998
- JHKLM photometry - Standard systems, passbands, and intrinsic colorsPublications of the Astronomical Society of the Pacific, 1988
- The Effects of Limb Darkening on Measurements of Angular Size with an Intensity InterferometerMonthly Notices of the Royal Astronomical Society, 1974