TEPCat: WASP-18


 

This page summarises the information held within TEPCat for the transiting planetary system WASP-18. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2009Natur.460.1098H  
Date of discovery paper 2009 / 8 / 27 y / m / d
Right ascension 01 37 25.03 h m s
Declination −45 40 40.4 d m s
V-band apparent magnitude 9.27 mag
K-band apparent magnitude 8.13 mag
Transit duration 0.09089
( 2.1814 )
day
hour
Transit depth 1.2 %
Time of mid-transit   2455265.5525 ± 0.0001     HJD or BJD
Orbital period 0.9414523 ± 0.0000003 days
Reference for orbital ephemeris   2013MNRAS.428.2645M  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6400 ± 70 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.10 ± 0.08 dex
Stellar mass 1.295 ± 0.059   Msun
Stellar radius 1.255 ± 0.028 Rsun
Stellar logarithmic surface gravity 4.353 ± 0.017 c.g.s.
Stellar mean density 0.655 ± 0.035
( 0.924 ± 0.049 )
ρsun
g cm-3
Orbital eccentricity 0.0092 ± 0.0028  
Orbital semimajor axis   0.02055 ± 0.00031  AU
Planetary mass 10.52 ± 0.32
( 33442 ± 1017 )
Mjup
Mearth
Planetary radius 1.204 ± 0.028
( 13.50 ± 0.31 )
Rjup
Rearth
Planetary surface gravity 179.9 ± 6.4
4.26 ± 0.02
m/s2
log(cgs)
Planetary mean density 5.64 ± 0.31
( 7.48 ± 0.41 )
ρjup
g cm-3
Planetary equilibrium temperature 2411 ± 35 K
Reference of detailed study 2013MNRAS.428.2645M  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Triaud et al. (2010)   4.0   ±   5.0  
Albrecht et al. (2012)   13   ±   7  

 

 

WASP-18 has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.

 


Page generated on 2017/12/15           John Southworth   (Keele University, UK)