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, 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, and S. Udry
TL;DR
This paper reports the discovery of WASP-31b, a low-density giant exoplanet orbiting a metal-poor late-F dwarf star, highlighting its physical characteristics and its significance among similar low-density planets.
Contribution
The paper presents the discovery and characterization of a new low-density exoplanet, WASP-31b, including its mass, radius, and orbital parameters, expanding knowledge of such planets around metal-poor stars.
Findings
WASP-31b has a mass of 0.48 Jupiter masses.
WASP-31b has a radius of 1.55 Jupiter radii.
WASP-31b is the second-lowest density planet after WASP-17b.
Abstract
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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