TEPCat: Kepler-8


 

This page summarises the information held within TEPCat for the transiting planetary system Kepler-8. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2010ApJ...724.1108J  
Date of discovery paper 2010 / 1 / 5 y / m / d
Right ascension 18 45 09.14 h m s
Declination +42 27 03.8 d m s
V-band apparent magnitude 13.65 mag
K-band apparent magnitude 12.29 mag
Transit duration 0.1337
( 3.209 )
day
hour
Transit depth 0.98 %
Time of mid-transit   2455003.433596 ± 0.000064     HJD or BJD
Orbital period 3.52249905 ± 0.00000083 days
Reference for orbital ephemeris   2013A+A...560A.112M  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6213 ± 150 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.055 ± 0.05 dex
Stellar mass 1.230 ± 0.072   Msun
Stellar radius 1.495 ± 0.037 Rsun
Stellar logarithmic surface gravity 4.178 ± 0.022 c.g.s.
Stellar mean density 0.368 ± 0.014
( 0.519 ± 0.020 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.0485 ± 0.0012  AU
Planetary mass 0.59 ± 0.12
( 187 ± 38 )
Mjup
Mearth
Planetary radius 1.381 ± 0.037
( 15.48 ± 0.41 )
Rjup
Rearth
Planetary surface gravity 7.7 ± 1.4
2.89 ± 0.07
m/s2
log(cgs)
Planetary mean density 0.210 ± 0.040
( 0.279 ± 0.053 )
ρjup
g cm-3
Planetary equilibrium temperature 1662 ± 41 K
Reference of detailed study 2011MNRAS.417.2166S  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Jenkins et al. (2011)   −26.4   ±   10.1  
Albrecht et al. (2012)   5   ±   7  

 

 

Kepler-8 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same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses.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 68.4 ± 12.0 m/s
Stellar effective temperature 6213 ± 150 K
Stellar metal abundance ([Fe/H] or [M/H])   -0.05 ± 0.05 dex
Orbital inclination 84.23 ± 0.16   degrees
Fractional stellar radius (R* / a) 0.1432 ± 0.0018  
Fractional planetary radius (Rpl / a)   0.01360 ± 0.00021   
Light curve analysis reference 2011MNRAS.417.2166S  
 
Derived parameters Value Unit
Stellar mass 1.230 ± 0.072 ± 0.01 Msun
Stellar radius 1.495 ± 0.037 ± 0.005 Rsun
Stellar logarithmic surface gravity 4.178 ± 0.022 ± 0.002 c.g.s.
Stellar mean density 0.368 ± 0.014 ρsun
Orbital semimajor axis   0.0485 ± 0.0012 ± 0.0002  AU
Planetary mass 0.59 ± 0.12 ± 0.00 Mjup
Planetary radius 1.381 ± 0.037 ± 0.005 Rjup
Planetary surface gravity 7.7 ± 1.4 m/s2
Planetary mean density 0.210 ± 0.040 ± 0.001 ρjup
Planetary equilibrium temperature 1662 ± 41 K
Safronov number 0.0337 ± 0.0063 ± 0.0001  
Main analysis reference 2011MNRAS.417.2166S  

 


Page generated on 2017/08/07           John Southworth   (Keele University, UK)