TEPCat: CoRoT-18


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2011A+A...533A.130H  
Date of discovery paper 2011 / 7 / 12 y / m / d
Right ascension 06 32 41.36 h m s
Declination −00 01 53.7 d m s
V-band apparent magnitude 15.00 mag
K-band apparent magnitude 13.01 mag
Transit duration 0.0995
( 2.388 )
day
hour
Transit depth 2.0 %
Time of mid-transit   2455321.72565 ± 0.00024     HJD or BJD
Orbital period 1.9000900 ± 0.0000005 days
Reference for orbital ephemeris   arXiv:1812.01536  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 5440 ± 100 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.1 ± 0.1 dex
Stellar mass 0.88 ± 0.07   Msun
Stellar radius 0.883 +0.025 −0.031 Rsun
Stellar logarithmic surface gravity 4.491 +0.015 −0.023 c.g.s.
Stellar mean density 1.28 +0.04 −0.09
( 1.806 +0.056 −0.127 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.0288 ± 0.0008  AU
Planetary mass 3.30 ± 0.19
( 1049 ± 60 )
Mjup
Mearth
Planetary radius 1.146 +0.039 −0.048
( 12.85 + 0.44 − 0.54 )
Rjup
Rearth
Planetary surface gravity 61.7 +3.1 −4.2
3.79 +0.02 −0.03
m/s2
log(cgs)
Planetary mean density 2.06 +0.24 −0.29
( 2.73 +0.32 −0.38 )
ρjup
g cm-3
Planetary equilibrium temperature 1487 ± 19 K
Reference of detailed study arXiv:1812.01536  

 

Entries in the catalogue of orbital obliquity measurements:
 
Reference λ (degrees)
Hébrard et al. (2011)   −10   ±   20  

 

 

CoRoT-18 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same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses.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 590 ± 14 m/s
Stellar effective temperature 5440 ± 100 K
Stellar metal abundance ([Fe/H] or [M/H])   -0.1 ± 0.1 dex
Orbital inclination 86.8 ± 1.7   degrees
Fractional stellar radius (R* / a) 0.1502 ± 0.0072  
Fractional planetary radius (Rpl / a)   0.0209 ± 0.0013   
Light curve analysis reference 2012MNRAS.426.1291S  
 
Derived parameters Value Unit
Stellar mass 0.861 ± 0.059 ± 0.017 Msun
Stellar radius 0.924 ± 0.057 ± 0.006 Rsun
Stellar logarithmic surface gravity 4.442 ± 0.043 ± 0.003 c.g.s.
Stellar mean density 1.09 ± 0.16 ρsun
Orbital semimajor axis   0.02860 ± 0.00065 ± 0.00019  AU
Planetary mass 3.27 ± 0.17 ± 0.04 Mjup
Planetary radius 1.251 ± 0.083 ± 0.008 Rjup
Planetary surface gravity 51.8 ± 6.6 m/s2
Planetary mean density 1.56 ± 0.30 ± 0.01 ρjup
Planetary equilibrium temperature 1490 ± 45 K
Safronov number 0.173 ± 0.012 ± 0.001  
Main analysis reference 2012MNRAS.426.1291S  

 


Page generated on 2019/07/16           John Southworth   (Keele University, UK)