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Transiting exoplanets from the CoRoT space mission. XX. CoRoT-18b: a massive hot jupiter on a prograde, nearly aligned orbit | | G. Hebrard
; T.M. Evans
; R. Alonso
; M. Fridlund
; A. Ofir
; S. Aigrain
; T. Guillot
; J.M. Almenara
; M. Auvergne
; A. Baglin
; P. Barge
; A.S. Bonomo
; P. Borde
; F. Bouchy
; J. Cabrera
; L. Carone
; S. Carpano
; C. Cavarroc
; Sz. Csizmadia
; H.J. Deeg
; M. Deleuil
; R.F. Diaz
; R. Dvorak
; A. Erikson
; S. Ferraz-Mello
; D. Gandolfi
; N. Gibson
; M. Gillon
; E. Guenther
; A. Hatzes
; M. Havel
; L. Jorda
; H. Lammer
; A. Leger
; A. Llebaria
; T. Mazeh
; C. Moutou
; M. Ollivier
; H. Parviainen
; M. Patzold
; D. Queloz
; H. Rauer
; D. Rouan
; A. Santerne
; J. Schneider
; B. Tingley
; G. Wuchterl
; | | Date: |
11 Jul 2011 | | Abstract: | We report the detection of CoRoT-18b, a massive hot jupiter transiting in
front of its host star with a period of 1.9000693 +/- 0.0000028 days. This
planet was discovered thanks to photometric data secured with the CoRoT
satellite combined with spectroscopic and photometric follow-up ground-based
observations. The planet has a mass M_p = 3.47 +/- 0.38 M_Jup, a radius R_p =
1.31 +/- 0.18 R_Jup, and a density rho_p = 2.2 +/- 0.8 g/cm3. It orbits a G9V
star with a mass M_* = 0.95 +/- 0.15 M_Sun, a radius R_* = 1.00 +/- 0.13 R_Sun,
and a rotation period P_rot = 5.4 +/- 0.4 days. The age of the system remains
uncertain, stellar evolution models pointing either to a few tens Ma or several
Ga, while gyrochronology and lithium abundance point towards ages of a few
hundred Ma. This mismatch potentially points to a problem in our understanding
of the evolution of young stars, with possible significant implications for
stellar physics and the interpretation of inferred sizes of exoplanets around
young stars. We detected the Rossiter-McLaughlin anomaly in the CoRoT-18 system
thanks to the spectroscopic observation of a transit. We measured the obliquity
psi = 20 +/- 20 degrees (sky-projected value: lambda = -10 +/- 20 degrees),
indicating that the planet orbits in the same way the star is rotating and that
this prograde orbit is nearly aligned with the stellar equator. | | Source: | arXiv, 1107.2032 | | Services: | Forum | Review | PDF | Favorites | |
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