TEPCat: GJ 436


 

This page summarises the information held within TEPCat for the transiting planetary system GJ 436. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2007A+A...472L..13G  
Date of discovery paper 2007 / 5 / 6 y / m / d
Right ascension 11 42 11.09 h m s
Declination +26 42 23.6 d m s
V-band apparent magnitude 10.68 mag
K-band apparent magnitude 6.07 mag
Transit duration 0.04189
( 1.0054 )
day
hour
Transit depth 0.6 %
Time of mid-transit   2456295.431924 ± 0.000045     HJD or BJD
Orbital period 2.64389782 ± 0.00000008 days
Reference for orbital ephemeris   2014Natur.505...66K  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 3416 ± 54 K
Stellar metal abundance ([Fe/H] or [M/H])   −0.03 ± 0.20 dex
Stellar mass 0.507 +0.071 −0.062   Msun
Stellar radius 0.455 ± 0.018 Rsun
Stellar logarithmic surface gravity 4.83 ± 0.03 c.g.s.
Stellar mean density 5.37 +0.30 −0.27
( 7.58 +0.42 −0.38 )
ρsun
g cm-3
Orbital eccentricity 0.1616 +0.0041 −0.0032  
Orbital semimajor axis   0.0308 +0.0013 −0.0012  AU
Planetary mass 0.0799 +0.0066 −0.0063
( 25.4 +2.1 −2.0 )
Mjup
Mearth
Planetary radius 0.366 ± 0.014
( 4.10 ± 0.16 )
Rjup
Rearth
Planetary surface gravity 13 ± 1
3.11 ± 0.03
m/s2
log(cgs)
Planetary mean density 1.55 +0.12 −0.10
( 2.06 +0.16 −0.13 )
ρjup
g cm-3
Planetary equilibrium temperature 669 ± 22 K
Reference of detailed study 2014A+A...572A..73L  

 

GJ 436 does not have an entry in the catalogue of Rossiter-McLaughlin measurements.

 

GJ 436 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same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses.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 18.34 ± 0.52 m/s
Stellar effective temperature 3500 ± 100 K
Stellar metal abundance ([Fe/H] or [M/H])   -0.03 ± 0.2 dex
Orbital inclination 86.43 ± 0.18   degrees
Fractional stellar radius (R* / a) 0.0731 ± 0.0027  
Fractional planetary radius (Rpl / a)   0.00605 ± 0.00023   
Light curve analysis reference 2008MNRAS.386.1644S  
 
Derived parameters Value Unit
Stellar mass 0.459 ± 0.043 ± 0.017 Msun
Stellar radius 0.454 ± 0.029 ± 0.005 Rsun
Stellar logarithmic surface gravity 4.787 ± 0.030 ± 0.005 c.g.s.
Stellar mean density 4.92 ± 0.55 ρsun
Orbital semimajor axis   0.02887 ± 0.00089 ± 0.00035  AU
Planetary mass 0.0737 ± 0.0051 ± 0.0018 Mjup
Planetary radius 0.365 ± 0.018 ± 0.004 Rjup
Planetary surface gravity 13.7 ± 1.1 m/s2
Planetary mean density 1.41 ± 0.18 ± 0.02 ρjup
Planetary equilibrium temperature 669 ± 22 K
Safronov number 0.0253 ± 0.0015 ± 0.0003  
Main analysis reference 2010MNRAS.408.1689S  

 


Page generated on 2017/12/15           John Southworth   (Keele University, UK)