TEPCat: WASP-4


 

This page summarises the information held within TEPCat for the transiting planetary system WASP-4. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2008ApJ...675L.113W  
Date of discovery paper 2007 / 11 / 22 y / m / d
Right ascension 23 34 15.06 h m s
Declination −42 03 41.1 d m s
V-band apparent magnitude 12.46 mag
K-band apparent magnitude 10.75 mag
Transit duration 0.08994
( 2.1586 )
day
hour
Transit depth 2.9 %
Time of mid-transit   2454966.782814 ± 0.000021     HJD or BJD
Orbital period 1.338231624 ± 0.000000068 days
Reference for orbital ephemeris   2015MNRAS.450.3101B  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5540 ± 55 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.03 ± 0.09 dex
Stellar mass 0.927 ± 0.055   Msun
Stellar radius 0.910 ± 0.018 Rsun
Stellar logarithmic surface gravity 4.487 ± 0.010 c.g.s.
Stellar mean density 1.230 ± 0.022
( 1.736 ± 0.031 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.02318 ± 0.00046  AU
Planetary mass 1.249 ± 0.052
( 397 ± 16 )
Mjup
Mearth
Planetary radius 1.364 ± 0.028
( 15.29 ± 0.31 )
Rjup
Rearth
Planetary surface gravity 16.64 ± 0.33
3.221 ± 0.009
m/s2
log(cgs)
Planetary mean density 0.460 ± 0.015
( 0.610 ± 0.020 )
ρjup
g cm-3
Planetary equilibrium temperature 1673 ± 17 K
Reference of detailed study 2012MNRAS.426.1291S  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Triaud et al. (2010)   4   + 34   - 43  
Sanchis-Ojeda et al. (2011)   −1   + 14   - 12  

 

 

WASP-4 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)