TEPCat: XO-4


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper arXiv:0805.2921  
Date of discovery paper 2008 / 5 / 19 y / m / d
Right ascension 07 21 33.17 h m s
Declination +58 16 05.0 d m s
V-band apparent magnitude 10.67 mag
K-band apparent magnitude 9.41 mag
Transit duration 0.18448
( 4.4275 )
day
hour
Transit depth 0.8 %
Time of mid-transit   2454725.18901 ± 0.00025     HJD or BJD
Orbital period 4.1250707 ± 0.0000023 days
Reference for orbital ephemeris   2016ApJ...820...87V  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6397 ± 70 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.04 ± 0.05 dex
Stellar mass 1.293 +0.030 −0.029   Msun
Stellar radius 1.554 +0.042 −0.030 Rsun
Stellar logarithmic surface gravity 4.166 +0.013 −0.018 c.g.s.
Stellar mean density 0.344 +0.016 −0.022
( 0.485 +0.023 −0.031 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.05485 ± 0.00042  AU
Planetary mass 1.615 ± 0.10
( 513 ± 31 )
Mjup
Mearth
Planetary radius 1.317 +0.040 −0.029
( 14.76 + 0.45 − 0.33 )
Rjup
Rearth
Planetary surface gravity 23.0 +1.8 −1.7
3.36 +0.03 −0.03
m/s2
log(cgs)
Planetary mean density 0.658 +0.061 −0.063
( 0.873 +0.081 −0.084 )
ρjup
g cm-3
Planetary equilibrium temperature 1641 +25 −21 K
Reference of detailed study 2016ApJ...820...87V  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Narita et al. (2010)   −46.7   + 8.1   - 6.1  

 

 

XO-4 has been examined as part of the Homogeneous Studies of Transiting Extrasolar Planets project. The details from this work have been given below. In most instances they are the same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses. Separate statistical and systematic errorbars are given where relevant.

Measured parameters Value Unit
Orbital velocity amplitude 165.8 ± 6.2 m/s
Stellar effective temperature 6397 ± 70 K
Stellar metal abundance ([Fe/H] or [M/H])   -0.04 ± 0.05 dex
Orbital inclination 89.9 +0.1 −3.9   degrees
Fractional stellar radius (R* / a) 0.1300 +0.0283 −0.0051  
Fractional planetary radius (Rpl / a)   0.01124 +0.00334 −0.00054   
Light curve analysis reference 2011MNRAS.417.2166S  
 
Derived parameters Value Unit
Stellar mass 1.285 +0.117 −0.022 +0.014 −0.022 Msun
Stellar radius 1.531 +0.386 −0.068 +0.006 −0.009 Rsun
Stellar logarithmic surface gravity 4.177 +0.034 −0.172 ± 0.002 c.g.s.
Stellar mean density 0.358 +0.046 −0.160 ρsun
Orbital semimajor axis   0.05474 +0.00162 −0.00056 +0.00020 −0.00031  AU
Planetary mass 1.547 +0.110 −0.066 +0.011 −0.017 Mjup
Planetary radius 1.287 +0.385 −0.063 +0.005 −0.007 Rjup
Planetary surface gravity 23.1 +2.5 −9.4 m/s2
Planetary mean density 0.68 +0.11 −0.37 ± 0.00 ρjup
Planetary equilibrium temperature 1630 +170 −40 K
Safronov number 0.1023 +0.0065 −0.0240 +0.0006 −0.0004  
Main analysis reference 2011MNRAS.417.2166S  

 


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