TEPCat: HAT-P-2


 

This page summarises the information held within TEPCat for the transiting planetary system HAT-P-2. Please see here for descriptions of the quantities given below.

 

Discovery and basic observable quantities:
 
Quantity Value Unit
Reference of discovery paper 2007ApJ...670..826B  
Date of discovery paper 2007 / 4 / 29 y / m / d
Right ascension 16 20 36.36 h m s
Declination +41 02 53.1 d m s
V-band apparent magnitude 8.71 mag
K-band apparent magnitude 7.60 mag
Transit duration 0.1787
( 4.289 )
day
hour
Transit depth 0.6 %
Time of mid-transit   2455288.84969 ± 0.00039     HJD or BJD
Orbital period 5.6334675 ± 0.0000013 days
Reference for orbital ephemeris   arXiv:1702.03797  

 

Physical properties from the most recent detailed study:
 
Quantity Value Unit
Stellar effective temperature 6290 ± 60 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.14 ± 0.08 dex
Stellar mass 1.279 ± 0.046   Msun
Stellar radius 1.680 ± 0.150 Rsun
Stellar logarithmic surface gravity 4.092 ± 0.074 c.g.s.
Stellar mean density 0.268 ± 0.070
( 0.378 ± 0.099 )
ρsun
g cm-3
Orbital eccentricity 0.5091 ± 0.0005  
Orbital semimajor axis   0.06740 ± 0.00081  AU
Planetary mass 8.74 ± 0.27
( 2778 ± 85 )
Mjup
Mearth
Planetary radius 1.190 ± 0.120
( 13.3 ± 1.3 )
Rjup
Rearth
Planetary surface gravity 152 ± 30
4.18 ± 0.08
m/s2
log(cgs)
Planetary mean density 5.1 ± 1.5
( 6.8 ± 2.0 )
ρjup
g cm-3
Planetary equilibrium temperature 1516 ± 66 K
Reference of detailed study 2010MNRAS.408.1689S  

 

Entries in the catalogue of Rossiter-McLaughlin measurements:
 
Reference λ (degrees)
Winn et al. (2007)   1.2   ±   13.4  
Loeillet et al. (2008)   0.2   + 12.2   - 12.5  
Albrecht et al. (2012)   9   ±   10  

 

 

HAT-P-2 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same as the physical properties given above, but in some cases the Homogeneous Studies results given below have been superseded by newer analyses.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 983.9 ± 17.2 m/s
Stellar effective temperature 6290 ± 60 K
Stellar metal abundance ([Fe/H] or [M/H])   +0.14 ± 0.08 dex
Orbital inclination 85.9 ± 1.5   degrees
Fractional stellar radius (R* / a) 0.1162 ± 0.0099  
Fractional planetary radius (Rpl / a)   0.00847 ± 0.00082   
Light curve analysis reference 2010MNRAS.408.1689S  
 
Derived parameters Value Unit
Stellar mass 1.279 ± 0.042 ± 0.019 Msun
Stellar radius 1.68 ± 0.15 ± 0.01 Rsun
Stellar logarithmic surface gravity 4.092 ± 0.074 ± 0.002 c.g.s.
Stellar mean density 0.268 ± 0.070 ρsun
Orbital semimajor axis   0.06740 ± 0.00074 ± 0.00034  AU
Planetary mass 8.74 ± 0.25 ± 0.09 Mjup
Planetary radius 1.19 ± 0.12 ± 0.01 Rjup
Planetary surface gravity 152 ± 30 m/s2
Planetary mean density 4.8 ± 1.4 ± 0.0 ρjup
Planetary equilibrium temperature 1516 ± 66 K
Safronov number 0.771 ± 0.077 ± 0.004  
Main analysis reference 2010MNRAS.408.1689S  

 


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