WASP-31b: a low-density planet transiting a metal-poor, late-F-type dwarf star

D. R. Anderson , A. Collier Cameron , C. Hellier , M. Lendl , T. A. Lister , P. F. L. Maxted , D. Queloz , B. Smalley

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A. M. S. Smith A. H. M. J. Triaud R. G. West D. J. A. Brown M. Gillon F. Pepe D. Pollacco D. Segransan R. A. Street S. Udry

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classification 🌌 astro-ph.EP

keywords planetwasp-31bdwarfjupiterlate-f-typelow-densitymetal-poorstar

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We report the discovery of the low-density, transiting giant planet WASP-31b. The planet is 0.48 Jupiter masses and 1.55 Jupiter radii. It is in a 3.4-day orbit around a metal-poor, late-F-type, V = 11.7 dwarf star, which is a member of a common proper motion pair. In terms of its low density, WASP-31b is second only to WASP-17b, which is a more highly irradiated planet of similar mass.

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WASP-31b: a low-density planet transiting a metal-poor, late-F-type dwarf star

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