TEPCat: HAT-P-4


 

This page summarises the information held within TEPCat for the transiting planetary system HAT-P-4. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2007ApJ...670L..41K  
Date of discovery paper 2007 / 8 / 14 y / m / d
Right ascension 15 19 57.93 h m s
Declination +36 13 46.9 d m s
V-band apparent magnitude 11.00 mag
K-band apparent magnitude 9.77 mag
Transit duration 0.1775
( 4.260 )
day
hour
Transit depth 0.9 %
Time of mid-transit   2454245.81521 ± 0.00020     HJD or BJD
Orbital period 3.0565254 ± 0.0000012 days
Reference for orbital ephemeris   2012PASP..124..212S  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6036 ± 46 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.277 ± 0.007 dex
Stellar mass 1.271 +0.120 −0.070   Msun
Stellar radius 1.600 +0.116 −0.041 Rsun
Stellar logarithmic surface gravity 4.134 +0.017 −0.038 c.g.s.
Stellar mean density 0.310 +0.016 −0.041
( 0.437 +0.023 −0.058 )
ρsun
g cm-3
Orbital eccentricity 0.0  
Orbital semimajor axis   0.04465 +0.00140 −0.00082  AU
Planetary mass 0.680 +0.046 −0.029
( 216.17 +14.62 −9.22 )
Mjup
Mearth
Planetary radius 1.337 +0.079 −0.035
( 14.99 + 0.89 − 0.39 )
Rjup
Rearth
Planetary surface gravity 9.42 +0.44 −0.91
2.97 +0.02 −0.04
m/s2
log(cgs)
Planetary mean density 0.266 +0.018 −0.038
( 0.353 +0.024 −0.050 )
ρjup
g cm-3
Planetary equilibrium temperature 1691 +46 −26 K
Reference of detailed study 2011MNRAS.417.2166S  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Winn et al. (2011)   −4.9   ±   11.9  

 

 

HAT-P-4 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same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses.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 81.1 ± 1.9 m/s
Stellar effective temperature 5860 ± 80 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.24 ± 0.08 dex
Orbital inclination 89.2 +0.8 −1.5   degrees
Fractional stellar radius (R* / a) 0.1666 +0.0080 −0.0027  
Fractional planetary radius (Rpl / a)   0.01431 +0.00072 −0.00028   
Light curve analysis reference 2011MNRAS.417.2166S  
 
Derived parameters Value Unit
Stellar mass 1.271 +0.096 −0.046 +0.072 −0.046 Msun
Stellar radius 1.600 +0.113 −0.037 +0.030 −0.019 Rsun
Stellar logarithmic surface gravity 4.134 +0.015 −0.038 +0.008 −0.005 c.g.s.
Stellar mean density 0.310 +0.016 −0.041 ρsun
Orbital semimajor axis   0.04465 +0.00113 −0.00062 +0.00084 −0.00054  AU
Planetary mass 0.680 +0.038 −0.025 +0.026 −0.016 Mjup
Planetary radius 1.337 +0.075 −0.032 +0.025 −0.016 Rjup
Planetary surface gravity 9.42 +0.44 −0.91 m/s2
Planetary mean density 0.266 +0.018 −0.038 +0.003 −0.005 ρjup
Planetary equilibrium temperature 1691 +46 −26 K
Safronov number 0.0357 +0.0012 −0.0021 +0.0004 −0.0007  
Main analysis reference 2011MNRAS.417.2166S  

 


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