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WASP-38b: A 6.87 day period exoplanet transiting a bright F-type star | | S. C. C. Barros
; F. Faedi
; A. Collier Cameron
; T. A. Lister
; J. McCormac
; D. Pollacco
; E. K. Simpson
; B. Smalley
; R. A. Street
; I. Todd
; A. H. M. J. Triaud
; I. Boisse
; F. Bouchy
; G. Hebrard
; C. Moutou
; F. Pepe
; D. Queloz
; A. Santerne
; D. Segransan
; S. Udry
; J. Bento
; O. W. Butters
; B. Enoch
; C. A. Haswell
; C. Hellier
; F. P. Keenan
; G. R. M. Miller
; V. Moulds
; A. J. Norton
; N. Parley
; I. Skillen
; C. A. Watson
; R. G. West
; P. J. Wheatley
; | | Date: |
5 Oct 2010 | | Abstract: | We report the discovery of WASP-38b, a long period transiting planet in an
eccentric $6.871815$ day orbit. The transit epoch is $2455335.92050 pm
0.00074$ (HJD) and the transit duration is $4.663$ hours. We performed a
spectral analysis of the host star HD 146389/BD+10 2980 that yielded $T_{eff} =
6150 pm 80 $K, logg$=4.3 pm 0.1$, vsini=$8.6 pm 0.4 $kms, $M_*=1.16 pm
0.04$Msun and $R_* =1.36 pm 0.05 $Rsun, consistent with a dwarf of spectral
type F8. The radial velocity variations and the transit light curves were
fitted simultaneously to estimate the orbital and planetary parameters. The
planet has a mass of $2.71 pm 0.07 $ Mjup and a radius of $1.08 pm 0.05,
$Rjup, giving a density, $
ho_p = 2.2 pm 0.3
ho_J$. The high precision
of the eccentricity $e=0.032 pm 0.0045$ is due to the relative transit timing
from the light curves and the RV shape. The planet equilibrium temperature is
estimated at $1311 pm 45$K. WASP-38b is the longest period planet found by
WASP-North and with a bright host star (V = $9.4,$ mag), is a good candidate
for followup atmospheric studies. | | Source: | arXiv, 1010.0849 | | Services: | Forum | Review | PDF | Favorites | |
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