WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b,  and WASP-192b. Issue 1 (30th September 2019)

• Record Type: Journal Article
• Authors: Hellier, Coel; Anderson, D R; Barkaoui, K; Benkhaldoun, Z; Bouchy, F; Burdanov, A; Cameron, A Collier; Delrez, L; Gillon, M; Jehin, E; Nielsen, L D; Maxted, P F L; Pepe, F; Pollacco, D; Pozuelos, F J; Queloz, D; Ségransan, D; Smalley, B; Triaud, A H M J; Turner, O D; Udry, S; West, R G
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 490:Issue 1(2019)
• Page Start: 1479
• Page End: 1487
• Publication Date: 2019-09-30
• Subjects: stars: individual: WASP-178 -- stars: individual: WASP-184 -- stars: individual: WASP-185 -- stars: individual: WASP-192 -- planetary systems; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stz2713
• Languages: English
• ISSNs: 0035-8711

Abstract

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 T eff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 R Jup, 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 ultrahot 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 per cent) even though the planets have moderately inflated radii of 1.2–1.3 R Jup . 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.