Transiting exoplanets from the CoRoT space mission - XII. CoRoT-12b: a short-period low-density planet transiting a solar analog star

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Volume 520 (September-October 2010)

A&A, 520 (2010) A97

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Table 5:

Median and 1- $\sigma$ limits of the posterior distributions obtained for the CoRoT-12 system derived from our three MCMC runs (see Table 4).
Parameter	MCMC₁	MCMC₂	MCMC₃
Jump parameters
Planet/star area ratio $(R_{\rm p} /R_{\rm s} )^2$	$0.01744^{\rm +0.00039}_{-0.00040}$	$0.01739^{\rm +0.00044}_{-0.00041}$	$0.01735^{\rm +0.00044}_{-0.00043}$
$b' = a \cos{i}/R_\ast$ [R_*]	$0.609^{\rm + 0.055}_{- 0.057}$	$0.614^{\rm + 0.060}_{- 0.056}$	$0.592^{\rm + 0.040}_{- 0.046}$
Transit width W [d]	$0.10726^{\rm +0.00089}_{-0.00090}$	$0.1071^{\rm +0.0013}_{-0.0011}$	$0.1071^{\rm +0.0011}_{-0.0013}$
T₀-2450000 [HJD]	$4398.62707 \pm 0.00036$	$4398.62704^{\rm +0.00038}_{-0.00036}$	$4398.6266^{\rm +0.0013}_{-0.0012}$
Orbital period P [d]	$2.828042 \pm 0.000013$	$2.828043^{\rm +0.000013}_{-0.000014}$	$2.828061^{\rm +0.000052}_{-0.000047}$
RV K₂ [m s^-1 d^1/3]	$177^{\rm +12}_{-11}$	$176 \pm 11$	$177 \pm 10$
$e \cos{\omega}$	$-0.012^{\rm +0.024}_{-0.028}$	$0.000^{\rm +0.020}_{-0.040}$	$-0.017^{\rm +0.024}_{-0.026}$
$e \sin{\omega}$	$0.053^{\rm +0.073}_{-0.066}$	$0.069^{\rm +0.069}_{-0.082}$	$0.043^{\rm +0.072}_{-0.053}$
c₁	$1.152 \pm 0.056$	$1.153^{\rm +0.054}_{-0.059}$	$1.146^{\rm +0.058}_{-0.050}$
c₂	$0.028 \pm 0.052$	$0.031^{\rm +0.052}_{-0.051}$	$0.027^{\rm +0.048}_{-0.049}$
dF₂		$0.00009^{\rm + 0.00022}_{- 0.00009}$
Deduced stellar parameters
u₁	$0.466 \pm 0.027$	$0.468^{\rm + 0.026}_{- 0.029}$	$0.464^{\rm + 0.028}_{- 0.025}$
u₂	$0.219 \pm 0.021$	$0.217 \pm 0.020$	$0.219^{\rm +0.020}_{-0.019}$
Density $\rho _*$ [ $\rho_\odot$ ]	$0.77^{\rm + 0.20}_{- 0.15}$	$0.75^{\rm + 0.20}_{- 0.15}$	$0.81^{\rm + 0.18}_{- 0.12}$
Surface gravity $\log g_*$ [cgs]	$4.375^{\rm + 0.065}_{- 0.062}$	$4.366^{\rm + 0.066}_{- 0.063}$	$4.388^{\rm + 0.055}_{- 0.046}$
Mass $M_\ast$ [ $M_\odot$ ]	$1.078^{\rm +0.077}_{-0.072}$	$1.083^{\rm +0.075}_{-0.074}$	$1.076^{\rm +0.077}_{-0.071}$
Radius $R_\ast$ [ $R_\odot$ ]	$1.116^{\rm +0.096}_{-0.092}$	$1.129^{\rm + 0.097}_{- 0.092}$	$1.098^{\rm + 0.072}_{- 0.076}$
Deduced planet parameters
RV K [ m s^-1 ]	$125.5^{\rm +8.0}_{-7.5}$	$125.4^{\rm +7.4}_{-7.7}$	$125.5 \pm 7.1$
$b_{\rm transit}$ [R_*]	$0.573^{\rm + 0.027}_{- 0.030}$	$0.571^{\rm + 0.031}_{- 0.033}$	$0.564^{\rm + 0.033}_{- 0.038}$
$b_{\rm occultation}$ [R_*]	$0.64^{\rm + 0.10}_{- 0.09}$	$0.65^{\rm + 0.11}_{- 0.09}$	$0.620^{\rm + 0.071}_{- 0.078}$
$T_{\rm occultation}-2450000$ [HJD]	$4400.020^{\rm +0.055}_{-0.052}$	$4400.041^{\rm +0.036}_{-0.073}$	$4400.010^{\rm +0.043}_{-0.048}$
Orbital semi-major axis a [AU]	$0.04016^{\rm +0.00093}_{-0.00092}$	$0.04022^{\rm +0.00091}_{-0.00093}$	$0.04013^{\rm +0.00094}_{-0.00090}$
Orbital inclination i [deg]	$85.48^{\rm +0.72}_{-0.77}$	$85.39^{\rm +0.72 }_{-0.84}$	$85.67^{\rm +0.59 }_{-0.51}$
Orbital eccentricity e	$0.070^{\rm +0.063}_{-0.042}$	$0.083^{\rm +0.062}_{-0.047}$	$0.059^{\rm +0.061}_{-0.031}$
Argument of periastron $\omega$ [deg]	$105^{\rm +90}_{-27}$	$87^{\rm +33}_{-88}$	$113^{\rm +92}_{-26}$
Equilibrium temperature $T_{\rm eq}$ [K]^a	$1442 \pm 58$	$1449^{\rm +60}_{-58}$	$1431 \pm 47$
Density $\rho_{\rm p}$ [ $\rho_{\rm Jup}$ ]	$0.309^{\rm +0.097}_{-0.071}$	$0.298^{\rm +0.093}_{-0.069}$	$0.327^{\rm +0.082}_{-0.058}$
Surface gravity $\log g_{\rm p}$ [cgs]	$3.043^{\rm +0.082}_{-0.080}$	$3.031^{\rm +0.083}_{-0.077}$	$3.060^{\rm +0.065}_{-0.063}$
Mass $M_{\rm p}$ [ $M_{\rm Jup}$ ]	$0.917^{\rm +0.070}_{-0.065}$	$0.916^{\rm +0.068}_{-0.064}$	$0.915^{\rm +0.068}_{-0.064}$
Radius $R_{\rm p}$ [ $R_{\rm Jup}$ ]	$1.44 \pm 0.13$	$1.45^{\rm + 0.13}_{- 0.12}$	$1.41^{\rm + 0.10}_{- 0.09}$

Notes. MCMC₁ is our nominal analysis (see text for details). ^a Assuming A=0 and F=1.

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