WASP-38b

A transiting exoplanet in an eccentric, 6.87d period orbit

S. C C Barros, F. Faedi, A. Collier Cameron, T. A. Lister, J. McCormac, D. Pollacco, E. K. Simpson, B. Smalley, R. A. Street, I. Todd, A. H M J Triaud, I. Boisse, F. Bouchy, G. Hébrard, C. Moutou, F. Pepe, D. Queloz, A. Santerne, D. Segransan, S. Udry & 14 others J. Bento, O. W. Butters, B. Enoch, C. A. Haswell, C. Hellier, F. P. Keenan, G. R M Miller, V. Moulds, A. J. Norton, N. Parley, I. Skillen, C. A. Watson, R. G. West, P. J. Wheatley

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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 Teff = 6150 ± 80 K, log g = 4.3 ± 0.1, v sin i = 8.6 ± 0.4 kms-1, M* = 1.16 ± 0.04 M; and R* = 1.33 ± 0.03 R, 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 MJup and a radius of 1.09 ± 0.03 R Jup giving a density, p = 2.1 ± 0.1 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.

Original languageEnglish
Article numberA54
Pages (from-to)1-6
Number of pages6
JournalAstronomy and Astrophysics
Volume525
DOIs
Publication statusPublished - 1 Dec 2010

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    Barros, S. C. C., Faedi, F., Collier Cameron, A., Lister, T. A., McCormac, J., Pollacco, D., ... Wheatley, P. J. (2010). WASP-38b: A transiting exoplanet in an eccentric, 6.87d period orbit. Astronomy and Astrophysics, 525, 1-6. [A54]. https://doi.org/10.1051/0004-6361/201015800