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arXiv · 1210.4257

WASP-64b and WASP-72b: two new transiting highly irradiated giant planets

M. Gillon·D. R. Anderson·A. Collier-Cameron·A. P. Doyle·A. Fumel·C. Hellier·E. Jehin·M. Lendl·P. F. L. Maxted·J. Montalban·F. Pepe·D. Pollacco·D. Queloz·D. Segransan·A. M. S. Smith·B. Smalley·J. Southworth·A. H. M. J. Triaud·S. Udry·R. G. West
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Abstract

We report the discovery by the WASP transit survey of two new highly irradiated giant planets transiting moderately bright stars. WASP-64b is slightly more massive (1.271+-0.068 M_Jup) and larger (1.271+-0.039 R_Jup) than Jupiter, and is in very-short (a=0.02648+-0.00024 AU, P=1.5732918+-0.0000015 days) circular orbit around a V=12.3 G7-type dwarf (1.004+-0.028 M_Sun, 1.058+-0.025 R_Sun, Teff=5500+-150 K). Its size is typical of hot Jupiters with similar masses. WASP-72b has also a mass a bit higher than Jupiter's (1.461-0.056+0.059 M_Jup) and orbits very close (0.03708+-0.00050 AU, P=2.2167421+-0.0000081 days) to a bright (V=9.6) and moderately evolved F7-type star (1.386+-0.055 M_Sun, 1.98+-0.24 R_Sun, Teff=6250+-100 K). Despite its extreme irradiation (about 5.5 10^9 erg/s/cm^2), WASP-72b has a moderate size (1.27+-0.20 R_Jup) that could suggest a significant enrichment in heavy elements. Nevertheless, the errors on its physical parameters are still too high to draw any strong inference on its internal structure or its possible peculiarity.

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M. Gillon, D. R. Anderson, A. Collier-Cameron, A. P. Doyle, A. Fumel, C. Hellier, E. Jehin, M. Lendl, P. F. L. Maxted, J. Montalban, F. Pepe, D. Pollacco, D. Queloz, D. Segransan, A. M. S. Smith, B. Smalley, J. Southworth, A. H. M. J. Triaud, S. Udry, R. G. West. 2013-02-25. WASP-64b and WASP-72b: two new transiting highly irradiated giant planets. https://doi.org/10.1051/0004-6361%2F201220561

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