TEPCat: HAT-P-18


 

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

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2011ApJ...726...52H  
Date of discovery paper 2010 / 7 / 29 y / m / d
Right ascension 17 05 23.28 h m s
Declination +33 00 45.0 d m s
V-band apparent magnitude 12.76 mag
K-band apparent magnitude 10.23 mag
Transit duration 0.1131
( 2.714 )
day
hour
Transit depth 1.9 %
Time of mid-transit   2454715.02254 ± 0.00039     HJD or BJD
Orbital period 5.5080291 ± 0.0000042 days
Reference for orbital ephemeris   2015MNRAS.451.4060S  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 4870 ± 50 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.10 ± 0.06 dex
Stellar mass 0.770 ± 0.027   Msun
Stellar radius 0.717 ± 0.026 Rsun
Stellar logarithmic surface gravity 4.613 ± 0.031 c.g.s.
Stellar mean density 2.08 ± 0.21
( 2.93 ± 0.30 )
ρsun
g cm-3
Orbital eccentricity 0.009 +0.03 −0.009  
Orbital semimajor axis   0.0559 ± 0.0007  AU
Planetary mass 0.196 ± 0.008
( 62.3 ± 2.5 )
Mjup
Mearth
Planetary radius 0.947 ± 0.044
( 10.61 ± 0.49 )
Rjup
Rearth
Planetary surface gravity 5.42 ± 0.55
2.73 ± 0.04
m/s2
log(cgs)
Planetary mean density 0.216 ± 0.032
( 0.287 ± 0.042 )
ρjup
g cm-3
Planetary equilibrium temperature 841 ± 15 K
Reference of detailed study 2014A+A...564L..13E  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Esposito et al. (2014)   132   ±   15  

 

 

HAT-P-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)