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WASP-86b and WASP-102b: super-dense versus bloated planets | | F. Faedi
; Y. Gómez Maqueo Chew
; D. Pollacco
; D. J. A. Brown
; G. Hébrard
; B. Smalley
; K. W. F. Lam
; D. Veras
; D. Anderson
; A. P. Doyle
; M. Gillon
; M. R. Goad
; M. Lendl
; L. Mancini
; J. McCormac
; I. Plauchu-Frayn
; J. Prieto-Arranz
; A. Scholz
; R. Street
; A. H. M. Triaud
; R. West
; P. J. Wheatley
; D. J. Armstrong
; S. C. C. Barros
; I. Boisse
; F. Bouchy
; P. Boumis
; A. Collier Cameron
; C. A. Haswell
; K. L. Hay
; C. Hellier
; U. Kolb
; P. F. L. Maxted
; A. J. Norton
; H. P. Osborn
; E. Palle
; F. Pepe
; D. Queloz
; D. Ségransan
; S. Udry
; P. A. Wilson
; | | Date: |
15 Aug 2016 | | Abstract: | We report the discovery of two transiting planetary systems: a super dense,
sub-Jupiter mass planet WASP-86b (mpl = 0.82 $pm$ 0.06 mj,
pl = 0.63
$pm$ 0.01
j), and a bloated, Saturn-like planet WASP-102b (mpl = 0.62
$pm$ 0.04 mj,
pl=1.27 $pm$ 0.03
j). They orbit their host star every
$sim$5.03, and $sim$2.71 days, respectively. The planet hosting WASP-86 is a
F7 star ( eff = 6330$pm$110 K, feh = $+$0.23 $pm$ 0.14 dex, and age
$sim$0.8--1~Gyr), WASP-102 is a G0 star ( eff = 5940$pm$140 K, feh =
$-$0.09$pm$ 0.19 dex, and age $sim$1~Gyr). These two systems highlight the
diversity of planetary radii over similar masses for giant planets with masses
between Saturn and Jupiter. WASP-102b shows a larger than model-predicted
radius, indicating that the planet is receiving a strong incident flux which
contributes to the inflation of its radius. On the other hand, with a density
of $
ho_{pl}$ = 3.24$pm$~0.3~$
ho_{jup}$, WASP-86b is the densest gas giant
planet among planets with masses in the range 0.05 $<M$_{pl}$<$ 2.0 mj. With a
stellar mass of 1.34 M$_{odot}$ and feh = $+$0.23 dex, WASP-86 could host
additional massive and dense planets given that its protoplanetary disc is
expected to also have been enriched with heavy elements. In order to match
WASP-86b’s density, an extrapolation of theoretical models predicts a planet
composition of more than 80\% in heavy elements (whether confined in a core or
mixed in the envelope). This fraction corresponds to a core mass of
approximately 210me for WASP-86b’s mass of mpl$sim$260,me. Only planets
with masses larger than about 2mj have larger densities than that of
WASP-86b, making it exceptional in its mass range. | | Source: | arXiv, 1608.4225 | | Services: | Forum | Review | PDF | Favorites | |
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