Six newly-discovered hot Jupiters transiting F/G stars: WASP-87b, WASP-108b, WASP-109b, WASP-110b, WASP-111b & WASP-112b

Anderson, D.R.; Brown, D.J.A.; Collier Cameron, A.; Delrez, L.; Fumel, A.; Gillon, M.; Hellier, C.; Jehin, E.; Lendl, M.; Maxted, P.F.L.; Neveu-VanMalle, M.; Pepe, F.; Pollacco, D.; Queloz, D.; Rojo, P.; Segransan, D.; Serenelli, A.M.; Smalley, B.; Smith, A.M.S.; Southworth, J.; Triaud, A.H.M.J.; Turner, O.D.; Udry, S.; West, R.G.

Abstract

We present the discoveries of six transiting hot Jupiters: WASP-87b, WASP-108b, WASP-109b, WASP-110b, WASP-111b and WASP-112b. The planets have masses of 0.51--2.2 MJup and radii of 1.19--1.44 RJup and are in orbits of 1.68--3.78 d around stars with masses 0.81--1.50 M⊙.
WASP-111b is in a prograde, near-aligned (λ=−5±16∘), near-circular (e<0.10 at 2 σ) orbit around a mid-F star. As tidal alignment around such a hot star is thought to be inefficient, this suggests that either the planet migrated inwards through the protoplanetary disc or that scattering processes happened to leave it in a near-aligned orbit. WASP-111 appears to have transitioned from an active to a quiescent state between the 2012 and 2013 seasons, which makes the system a candidate for studying the effects of variable activity on a hot-Jupiter atmosphere. We find evidence that the mid-F star WASP-87 is a visual binary with a mid-G star. Two host stars are metal poor: WASP-112 has [Fe/H] = −0.64±0.15 and WASP-87 has [Fe/H] = −0.41±0.10. The low density of WASP-112 (0.81 M⊙, 0.80±0.04 ρ⊙) cannot be matched by standard models for any reasonable value of the age of the star, suggesting it to be affected by the "radius anomaly".

Citation

Anderson, D., Brown, D., Collier Cameron, A., Delrez, L., Fumel, A., Gillon, M., …West, R. (2014). Six newly-discovered hot Jupiters transiting F/G stars: WASP-87b, WASP-108b, WASP-109b, WASP-110b, WASP-111b & WASP-112b. arXiv,

• Journal Article Type: Article
• Online Publication Date: Oct 13, 2014
• Publication Date: Oct 13, 2014
• Deposit Date: Jun 15, 2023
• Journal: arXiv
• Print ISSN: 2331-8422
• Publisher: Cornell University
• Peer Reviewed: Not Peer Reviewed