TEPCat: KELT-9


 

This page summarises the information held within TEPCat for the transiting planetary system KELT-9. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2017Natur.546..514G  
Date of discovery paper 2017 / 6 / 6 y / m / d
Right ascension 20 31 26.35 h m s
Declination +39 56 19.8 d m s
V-band apparent magnitude 7.56 mag
K-band apparent magnitude 7.48 mag
Transit duration 0.16361
( 3.9266 )
day
hour
Transit depth 0.68 %
Time of mid-transit   2457095.68572 ± 0.00014     HJD or BJD
Orbital period 1.4811235 ± 0.0000011 days
Reference for orbital ephemeris   2017Natur.546..514G  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 9600 ± 400 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.14 ± 0.30 dex
Stellar mass 2.32 ± 0.16   Msun
Stellar radius 2.418 ± 0.058 Rsun
Stellar logarithmic surface gravity 4.037 +0.038 −0.040 c.g.s.
Stellar mean density 0.164 ± 0.018
( 0.231 ± 0.025 )
ρsun
g cm-3
Orbital eccentricity 0.0 +0.035 −0.0  
Orbital semimajor axis   0.03368 ± 0.00078  AU
Planetary mass 2.88 ± 0.35
( 915 ± 111 )
Mjup
Mearth
Planetary radius 1.936 ± 0.047
( 21.70 ± 0.53 )
Rjup
Rearth
Planetary surface gravity 19.0 +2.5 −2.4
3.28 +0.05 −0.06
m/s2
log(cgs)
Planetary mean density 0.370 +0.054 −0.050
( 0.491 +0.072 −0.066 )
ρjup
g cm-3
Planetary equilibrium temperature 3921 +182 −174 K
Reference of detailed study arXiv:1907.10078  

 

Entries in the catalogue of orbital obliquity measurements:
 
Reference λ (degrees)
Gaudi et al. (2017)   −84.8   ±   1.4  
Borsa et al. (2019)   −85.78   ±   0.46  
Wyttenbach et al. (2020)   −85.01   ±   0.23  

 

 

KELT-9 has not been analysed as part of the Homogeneous Studies of Transiting Extrasolar Planets project.

 


Page generated on 2021/01/04           John Southworth   (Keele University, UK)