Interferometric Observations of the Transiting Planet HD 189733 with the CHARA Array

Details Interferometric Observations of the Transiting Planet HD 189733 with the CHARA Array Interferometric Observations of the Transiting Planet HD 189733 with the CHARA Array

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916301b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #163.01; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

The star HD 189733 (HIP 98505, GJ 4130, type K2 V) is one of only a handful of extrasolar planetary systems that show photometric variations due planetary transits. Bouchy et al. (A&A, 444, L15, 2005) discovered a hot Jupiter-like planet with an orbital period of 2.219 days and estimated the star's radius to be 0.76±0.01 Rsol. This value, along with a planet-to-star radius ratio of 0.172±0.003, led to a planetary radius of 1.26±0.03 RJup. We observed HD 189733 using the Georgia State University's Center for High Angular Resolution (CHARA) Array, a six-element optical/infrared interferometer located on Mount Wilson, California. The star was observed using the 331-m S1/E1 baseline over eight nights spanning May to August 2006. All observations were obtained with the "CHARA Classic" beam combiner using both the K'and H-band infrared wavelengths. We present data taken in order to determine the host star's radius from its angular diameter and parallax and thereby directly calculate a physical radius and density for the planet. This result is significant in that it represents the first extrasolar planetary diameter that has been determined through purely direct means.

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