Free Access

Table 6

Planetary and stellar parameters.

CoRoT-28b CoRoT-29b
Ephemeris

Planet orbital period P [days] 5.20851 ± 0.00038 2.850570 ± 0.000006
Transit epoch Ttr [HJD-2 450 000] 5755.8466 ± 0.0029 5753.115 ± 0.001
Transit duration dtr [h] 5.70 ± 0.09 2.19 ± 0.04
Results from radial velocity observations

Orbital eccentricity e 0.082 ± 0.081
Argument of periastron ω [°]
Radial velocity semi-amplitude K [ m s-1] 56.4 ± 4.9 125 ± 17
Systemic velocity Vr (HARPS) [ km s-1] 76.7081 ± 0.0051 64.1907 ± 0.0012
O–C residuals (HARPS) [ m s-1] 11 ± 11
Systemic velocity Vr (Sophie) [ km s-1] 76.7549 ± 0.0082
O–C residuals (Sophie) [ m s-1] 32.8 ± 6.4
Systemic velocity Vr (FIES) [ km s-1] 76.8642 ± 0.0074
O–C residuals (FIES) [ m s-1] 8.5 ± 8.3
Fitted transit parameters

Scaled semi-major axis a/Rs,eq 7.29 ± 0.16 9.22 ± 0.19
Radius ratio k = Rp/Rs 0.0551 ± 0.0004 0.1028 ± 0.0043
Quadratic limb darkening coefficientsau+ 0.78 ± 0.11 0.62 ± 0.15
u 0.37 ± 0.22 0.58 ± 0.14
Impact parameterbb 0.24 ± 0.09
Orbital inclination ip [deg] 87.3 ± 2.7
Stellar rotational axis inclination is [°] 46 ± 19
Stellar rotational axis orientation Ωs [°] 256 ± 40
Gravity darkening exponent β 0.89 ± 0.25
J2 for the star 0.028 ± 0.019
Contamination factor [%] 3 ± 1 54 ± 4
Deduced transit parameters

Stellar radius ratio f = Rs,pole/Rs,eq 1 (fixed) 0.94 ± 0.02
Ms1 / 3/Rs [solar units]c 0.58 ± 0.02 1.09 ± 0.02
Stellar density ρs [ kg m-3] 270 ± 6 1 825 ± 38
Impact parameterbb 0.43 ± 0.44
Orbital inclination ip [deg] 88.1 ± 0.8
Spectroscopic parameters

Effective temperature Teff [K] 5 150 ± 100 5 260 ± 100
Stellar surface gravity log  g [cgs] 3.6 ± 0.2 4.3 ± 0.2
Metallicity [ Fe/H ] [dex] 0.15 ± 0.10 0.20 ± 0.10
Stellar rotational velocity v sin i [ km s-1] 3.0 ± 0.5 3.5 ± 0.5
Microturbulence velocity Vmic [ km s-1] 0.9 ± 0.1 0.9 ± 0.1
Macroturbulence velocity Vmac [ km s-1] 3.3 ± 0.3 1.2 ± 0.3
Lithium equivalent width [mÅ] 31 no Li at 6708 Å
Spectral type G8/9IV K0 V
Stellar and planetary physical parameters from combined analysis

Star mass [M]c 1.01 ± 0.14 0.97 ± 0.14
Star radius [R]c 1.78 ± 0.11 0.90 ± 0.12
Stellar surface gravity log  g [cgs] 3.94 ± 0.12 4.52 ± 0.19
Age of the star t [Gyr] 12.0 ± 1.5 1−8
Distance of the system [pc] 560 ± 70 765 ± 50
Interstellar extinction Av [mag] 0.75 ± 0.20 0.85 ± 0.15
Orbital semi-major axis (Kepler’s law) a [AU] 0.0590 ± 0.0027 0.0390 ± 0.0020
Orbital semi-major axis (light curve) a [AU] 0.0603 ± 0.0050 0.0386 ± 0.0059
Planet mass Mp [MJup]d 0.484 ± 0.087 0.85 ± 0.20
Planet radius Rp [RJup]d 0.955 ± 0.066 0.90 ± 0.16
Planet density ρp [ g cm-3] 0.69 ± 0.27 1.45 ± 0.74
Planet surface gravity log g [cgs] 3.12 ± 0.14 3.42 ± 0.19

Notes.

(a)

I(μ) /I(1) = 1 − μ + uaμ + ub(1 − μ)2, where I(1) is the specific intensity at the centre of the disc and μ = cosγ, γ being the angle between the surface normal and the line of sight; u+ = ua + ub and u = uaub.

(b)

.

(c)

Radius and mass of Sun taken as 695 500 km and 1.9891 × 1030 kg, respectively (Lang 1999).

(d)

Radius and mass of Jupiter taken as 71 492 km and 1.8992 × 1027 kg, respectively (Lang 1999).

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.