WASP-38b: A Transiting Exoplanet in an Eccentric, 6.87d Period Orbit
Barros, S. C. C. · Faedi, F. · Cameron, A. Collier · Lister, T. A. · McCormac, J. · Pollacco, D. · Simpson, E. K. · Smalley, B. · Street, R. A. · Todd, I. · Triaud, A. H. M. J. · Boisse, I. · Bouchy, F. · Hebrard, G. · Moutou, C. · Pepe, F. · Queloz, D. · Santerne, A. · Segransan, D. · Udry, S. · Bento, J. · Butters, O. W. · Enoch, B. · Haswell, C. A. · Hellier, C. · Keenan, F. P. · Miller, G. R. M. · Moulds, V. · Norton, A. J. · Parley, N. · Skillen, I. · Watson, C. A. · West, R. G. · Wheatley, P. J.
الأصل · EN
We report the discovery of WASP-38b, a long period transiting planet in an eccentric 6.871815 day orbit. The transit epoch is 2455335.92050 +/- 0.00074 (HJD) and the transit duration is 4.663 hours. 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 Teff = 6150 +/- 80K, logg =4.3 +/- 0.1, vsini=8.6 +/- 0.4 km/s, M*=1.16 +/- 0.04 Msun and R* =1.33 +/- 0.03 Rsun, 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. The planet has a mass of 2.69 +/- 0.06 Mjup and a radius of 1.09 +/-0.03 Rjup giving a density, rhoₚ = 2.1 +/-0.1 rhoⱼup. 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 +/- 33K. 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.
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