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.
@article{arxiv.1210.4257,
title = {WASP-64b and WASP-72b: two new transiting highly irradiated giant planets},
author = {M. Gillon and D. R. Anderson and A. Collier-Cameron and A. P. Doyle and A. Fumel and C. Hellier and E. Jehin and M. Lendl and P. F. L. Maxted and J. Montalban and F. Pepe and D. Pollacco and D. Queloz and D. Segransan and A. M. S. Smith and B. Smalley and J. Southworth and A. H. M. J. Triaud and S. Udry and R. G. West},
journal= {arXiv preprint arXiv:1210.4257},
year = {2015}
}
Comments
Accepted for publication in Astronomy and Astrophysics. 12 pages, 13 figures. Version 2 presents new photometric data an updated parameters for the WASP-72 system