SOPHIE velocimetry of Kepler transit candidates - XVI. Tomographic measurement of the low obliquity of KOI-12b, a warm Jupiter transiting a fast rotator

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Volume 579 (July 2015)

A&A, 579 (2015) A55

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Table 5

Transit light curve and radial velocity analysis.

Parameter	Symbol	Value	Unit

Eccentric orbit

Orbital parameters
Orbital period	P	17.8552333 ±0.9 × 10^-6	day
Transit epoch	T₀	2 454 979.59599 ±2.7 × 10^-4	BJD
Eccentricity	e	<0.72 (3σ)
Argument of periastron	ω	228 ± 120	deg
Scaled semi-major axis	a_p/R_⋆	20.0 ± 1.5
Semi-major axis	a_p	0.151 ±3 × 10^-3	au
Orbital inclination	i_p	88.95	deg
Impact parameter	b	0.3629 ±6.4 × 10^-3
Planet-to-star radii ratio	R_p/R_⋆	0.09049 ±8 × 10^-5
Planet radius	R_p	1.43 ± 0.13	R_Jup
Transit duration	t_d	6.788	hours
Stellar reflex velocity	K	<0.8 (3σ)	km s^-1
Mass of KOI-12.01	M_p	< 10 (3σ)	M_Jup

Stellar parameters
Density	ρ_⋆	0.335 ± 0.080	ρ_sun
Radius	R_⋆	1.63 ± 0.15	R_sun
Age	ta u_⋆	1.5 ± 0.5	Gyr
Mass	M_⋆	1.452 ± 0.093	M_sun
Distance	D	426 ± 40	pc
Effective temperature	T_eff	6820 ± 120	K
Limb-darkening coefficients	ϵ_a	0.334 ± 0.007
	ϵ_b	0.124 ± 0.013

Circular orbit

Orbital parameters
Orbital period	P	17.8552332 ± 1.0 × 10^-6	day
Transit epoch	T₀	2 454 979.59601 ± 0.5 × 10^-4	BJD
Scaled semi-major axis	a_p/R_⋆	18.84 ± 0.04
Semi-major axis	a_p	0.151 ±3 × 10^-3	au
Orbital inclination	i_p	88.90 ± 0.02	deg
Impact parameter	b	0.362 ±7 × 10^-3
Planet-to-star radii ratio	R_p/R_⋆	0.09049 ±8 × 10^-5
Planet radius	R_p	1.44 ± 0.13	R_Jup
Transit duration	t_d	6.7827 ±2.6 × 10^-3	hours
Stellar reflex velocity	K	<0.51 (3σ)	km s^-1
Mass of KOI-12.01	M_p	<8.7 (3σ)	M_Jup

Stellar parameters
Limb-darkening coefficients	ϵ_a	0.335 ± 0.008
	ϵ_b	0.123 ± 0.014

Notes. All parameters are derived from the analysis of the transit light curve (Sect. 4), except for the limits on the Keplerian semi-amplitude and the mass of KOI-12.01 derived from the radial velocity analysis (Sect. 5.1). The derived Kepler transit epochs are given in Barycentric Dynamical Time.

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