Published in
EDP Sciences, Astronomy & Astrophysics, (525), p. A54, 2010
DOI: 10.1051/0004-6361/201015800
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WASP-38b: A transiting exoplanet in an eccentric, 6.87d period orbit
,
F. Faedi,
A. Collier Cameron,
Ta A. Lister,
J. J. McCormac,
Don Pollacco,
Ek K. Simpson,
B. Smalley,
Ra A. Street,
I. Todd,
G. Hebrard,
Ahmj H. M. J. Triaud,
I. Boisse,
F. Bouchy,
G. Hébrard
and other authors.
Full text: Download
Abstract
Aims. We report the discovery of WASP-38b, a long period transiting planet in an eccentric 6.871815 day orbit. The transit epoch is 2 455 335.92050 +/- 0.00074 (HJD) and the transit duration is 4.663 h. Methods. WASP-38b's discovery was enabled due to an upgrade to the SuperWASP-North cameras. We performed a spectral analysis of the host star HD 146389/BD + 10 2980 that yielded T-eff = 6150 +/- 80 K, log g = 4.3 +/- 0.1, v sin i = 8.6 +/- 0.4 km s(-1), M-* = 1.16 +/- 0.04 M-circle dot and R-* = 1.33 +/- 0.03 R-circle dot, consistent with a dwarf of spectral type F8. Assuming a main-sequence mass-radius relation for the star, we fitted simultaneously the radial velocity variations and the transit light curves to estimate the orbital and planetary parameters. Results. The planet has a mass of 2.69 +/- 0.06 M-Jup and a radius of 1.09 +/- 0.03 R-Jup giving a density,rho(p) = 2.1 +/- 0.1 rho(J). The high precision of the eccentricity e = 0.0314 +/- 0.0044 is due to the relative transit timing from the light curves and the RV shape. The planet equilibrium temperature is estimated at 1292 +/- 33 K. WASP-38b is the longest period planet found by SuperWASP-North and with a bright host star (V = 9.4 mag), is a good candidate for followup atmospheric studies.