WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b & WASP-192b

Smalley; Hellier; Maxted

Abstract

We report on four new transiting hot Jupiters discovered by the WASP-South survey. WASP-178b transits a V = 9.9, A1V star with Teff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 RJup, in line with the known correlation between high irradiation and large size. With an estimated temperature of 2470 ± 60 K, the planet is one of the best targets for studying ultra-hot Jupiters that is visible from the Southern hemisphere. The three host stars WASP-184, WASP-185 and WASP-192 are all post-main-sequence G0 stars of ages 4–8 Gyr. The larger stellar radii (1.3–1.7 M?) mean that the transits are relatively shallow (0.7–0.9%) even though the planets have moderately inflated radii of 1.2–1.3 RJup. WASP-185b has an eccentric orbit (e = 0.24) and a relatively long orbital period of 9.4 d. A star that is 4.6 arcsec from WASP-185 and 4.4 mag fainter might be physically associated.

Citation

Smalley, Hellier, & Maxted. (2019). WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b & WASP-192b. Monthly Notices of the Royal Astronomical Society, 1479-1487. https://doi.org/10.1093/mnras/stz2713

• Acceptance Date: Sep 29, 2019
• Publication Date: Nov 1, 2019
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Oxford University Press
• Pages: 1479-1487
• DOI: https://doi.org/10.1093/mnras/stz2713
• Keywords: stars: individual: WASP-178, stars: individual: WASP-184, stars: individual: WASP-185, stars: individual: WASP-192, planetary systems
• Publisher URL: https://doi.org/10.1093/mnras/stz2713