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WASP-38b : a transiting exoplanet in an eccentric, 6.87d period orbit

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Barros, S. C. C., Faedi, F., Cameron, A. Collier, Lister, T. A., McCormac, J. J., Pollacco, Don, Simpson, E. K., Smalley, B., Street, R. A., Todd, I. et al.

. (2011) WASP-38b : a transiting exoplanet in an eccentric, 6.87d period orbit. Astronomy & Astrophysics, Vol.525 . Article no.54. ISSN 0004-6361

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Official URL: http://dx.doi.org/10.1051/0004-6361/201015800

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.

Item Type:

Journal Article

Subjects:

Q Science > QB Astronomy

Divisions:

Faculty of Science > Physics

Journal or Publication Title:

Astronomy & Astrophysics

Publisher:

EDP Sciences

ISSN:

0004-6361