TEPCat: XO-2


 

This page summarises the information held within TEPCat for the transiting planetary system XO-2. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2007ApJ...671.2115B  
Date of discovery paper 2007 / 4 / 30 y / m / d
Right ascension 07 48 06.47 h m s
Declination +50 13 33.0 d m s
V-band apparent magnitude 11.25 mag
K-band apparent magnitude 9.31 mag
Transit duration 0.11260
( 2.7024 )
day
hour
Transit depth 1.4 %
Time of mid-transit   2455565.546480 ± 0.000054     HJD or BJD
Orbital period 2.61585922 ± 0.00000028 days
Reference for orbital ephemeris   2015A+A...575A.111D  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5332 ± 57 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.43 ± 0.05 dex
Stellar mass 0.96 ± 0.05   Msun
Stellar radius 0.998 +0.032 −0.033 Rsun
Stellar logarithmic surface gravity 4.44 ± 0.08 c.g.s.
Stellar mean density 0.960 +0.037 −0.034
( 1.355 +0.052 −0.048 )
ρsun
g cm-3
Orbital eccentricity 0.0 +0.006 −0.0  
Orbital semimajor axis   0.03616 +0.00119 −0.00247  AU
Planetary mass 0.597 ± 0.021
( 189.78 ± 6.68 )
Mjup
Mearth
Planetary radius 1.019 ± 0.031
( 11.42 ± 0.35 )
Rjup
Rearth
Planetary surface gravity 14.13 +10.1 −0.94
3.15 +0.23 −0.03
m/s2
log(cgs)
Planetary mean density 0.528 +0.054 −0.048
( 0.700 +0.072 −0.064 )
ρjup
g cm-3
Planetary equilibrium temperature 1328 +17 −28 K
Reference of detailed study 2015A+A...575A.111D  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Narita et al. (2011)   10   ±   72  
Damasso et al. (2015)   7   ±   11  

 

 

XO-2 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same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses.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 92.2 ± 1.7 m/s
Stellar effective temperature 5340 ± 50 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.45 ± 0.05 dex
Orbital inclination 88.8 ± 1.2   degrees
Fractional stellar radius (R* / a) 0.1237 +0.0024 −0.0047  
Fractional planetary radius (Rpl / a)   0.01300 +0.00033 −0.00070   
Light curve analysis reference 2010MNRAS.408.1689S  
 
Derived parameters Value Unit
Stellar mass 0.924 +0.054 −0.124 +0.076 −0.124 Msun
Stellar radius 0.962 +0.026 −0.054 +0.027 −0.044 Rsun
Stellar logarithmic surface gravity 4.436 +0.037 −0.035 +0.012 −0.020 c.g.s.
Stellar mean density 1.034 +0.127 −0.058 ρsun
Orbital semimajor axis   0.03616 +0.00065 −0.00182 +0.00100 −0.00167  AU
Planetary mass 0.593 +0.025 −0.057 +0.033 −0.054 Mjup
Planetary radius 0.984 +0.031 −0.071 +0.027 −0.045 Rjup
Planetary surface gravity 15.2 +1.8 −0.8 m/s2
Planetary mean density 0.582 +0.116 −0.046 +0.028 −0.016 ρjup
Planetary equilibrium temperature 1328 +17 −28 K
Safronov number 0.0472 +0.0040 −0.0022 +0.0016 −0.0013  
Main analysis reference 2012MNRAS.426.1291S  

 


Page generated on 2017/12/13           John Southworth   (Keele University, UK)