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Six newly-discovered hot Jupiters transiting F/G stars: WASP-87b, WASP-108b, WASP-109b, WASP-110b, WASP-111b & WASP-112b | | D. R. Anderson
; D. J. A. Brown
; A. Collier Cameron
; L. Delrez
; A. Fumel
; M. Gillon
; C. Hellier
; E. Jehin
; M. Lendl
; P. F. L. Maxted
; M. Neveu-VanMalle
; F. Pepe
; D. Pollacco
; D. Queloz
; P. Rojo
; D. Segransan
; A. M. Serenelli
; B. Smalley
; A. M. S. Smith
; J. Southworth
; A. H. M. J. Triaud
; O. D. Turner
; S. Udry
; R. G. West
; | | Date: |
14 Oct 2014 | | 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 $M_{
m Jup}$ and radii of 1.19--1.44 $R_{
m Jup}$ and are
in orbits of 1.68--3.78 d around stars with masses 0.81--1.50 $M_{
m odot}$.
WASP-111b is in a prograde, near-aligned ($lambda = -5 pm 16^circ$),
near-circular ($e < 0.10$ at 2 $sigma$) 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] = $-0.64 pm 0.15$ and WASP-87 has [Fe/H] =
$-0.41 pm 0.10$. The low density of WASP-112 (0.81 $M_{
m odot}$, $0.80 pm
0.04$ $
ho_{
m odot}$) 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". | | Source: | arXiv, 1410.3449 | | Services: | Forum | Review | PDF | Favorites | |
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