Confirmation of an exoplanet using the transit color signature: Kepler-418b, a blended giant planet in a multiplanet system

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Volume 567 (July 2014)

A&A, 567 (2014) A14

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Table 4

Kepler-418b planet and host star parameters from simultaneous Kepler and GTC light curve modeling.

System properties of Kepler-418b		Free u and v	Constrained u and v
Zero epoch	[HJD – 2 454 833]	175.59750 ± 0.00066	175.59734 ± 0.00068
Period	[d]	86.67856 ± 7 × 10^-5	86.67857 ± 8 × 10^-5
Radius ratio	[Rs]	0.1104 ± 0.0035	0.1110 ± 0.0032
Impact parameter	[−]	< 0.23 ^a	< 0.22 ^a
Inclination	[deg]	89.952 ± 0.041	89.950 ± 0.040
Transit duration	[h]	10.224 ± 0.042	10.236 ± 0.038
Scaled semi-major axis	[Rs]	84.4 ± 9.5	86 ± 10
Eccentricity	[−]	0.20 ± 0.11	0.22 ± 0.12
Omega	[deg]	4.35 ± 0.41	4.41 ± 0.50
RV semi-amplitude	[km s^-1]	< 0.050 ^a	< 0.42 ^a
Radius	[R_Jup]	1.20 ± 0.16	1.20 ± 0.16
Mass	[M_Jup]	< 1.1 ^a	< 0.88 ^a
Surface gravity^b (log g)	[dex]	2.83 ± 0.47	2.77 ± 0.45

System properties of KOI-1089.02		Free u and v	Constrained u and v
Zero epoch	[HJD – 2 454 833]	140.32089 ± 0.00090	140.32099 ± 0.00087
Period	[d]	12.21826 ± 1 × 10^-5	12.21826 ± 1 × 10^-5
Radius ratio	[Rs]	0.0577 ± 0.0019	0.0577 ± 0.0018
Impact parameter	[–]	0.827 ± 0.038	0.827 ± 0.033
Inclination	[deg]	87.60 ± 0.44	88.06 ± 0.44
Transit duration	[h]	2.808 ± 0.072	2.827 ± 0.066
Scaled semi-major axis	[Rs]	22.9 ± 2.6	23.4 ± 2.9
Eccentricity	[–]	< 0.50 ^a	< 0.45 ^a
Omega	[deg]	3.48 ± 0.55	3.62 ± 0.74
RV semi-amplitude	[km s^-1]	< 0.059 ^a	< 0.05 ^a
Radius	[R_Jup]	0.625 ± 0.083	0.62557 ± 0.082
Mass	[M_Jup]	< 0.64 ^a	< 0.57 ^a
Surface gravity^b (log g)	[dex]	3.24 ± 0.46	3.11 ± 0.46

Stellar properties from transit fit		Free u and v	Constrained u and v
K Linear ldc	[–]	0.374 ± 0.058	0.262 ± 0.025
K Quadratic ldc	[–]	0.14 ± 0.10	0.305 ± 0.046
z′ Linear ldc	[–]	0.073 ± 0.088	0.246 ± 0.056
z′ Quadratic ldc	[–]	0.36 ± 0.18	0.210 ± 0.059
g′ Linear ldc	[–]	0.29 ± 0.16	0.606 ± 0.068
g′ Quadratic ldc	[–]	0.79 ± 0.23	0.240 ± 0.089
Stellar density	[g/cm³]
K contamination	[–]	0.387 ± 0.037	0.393 ± 0.034
g′ contamination	[–]	0.257 ± 0.032	0.252 ± 0.029
z′ contamination	[–]	0.322 ± 0.037	0.335 ± 0.030
Contaminant temperature	[K]	4080 ± 160	4010 ± 130

Light curve noise characteristics		Free u and v	Constrained u and v
σ_K, long-cadence^c	[mmag]	0.4046 ± 0.0033	0.4056 ± 0.0034
σ_K, short-cadence^c	[mmag]	2.0230 ± 0.0044	2.0234 ± 0.0045
σ _{z ′} ^c	[mmag]	3.449 ± 0.088	3.476 ± 0.083
σ _{g ′} ^c	[mmag]	3.715 ± 0.095	3.715 ± 0.094

Notes. The posterior distributions for the two separate runs are described in Table 3.

^(a)

95% upper confidence limit.

^(b)

Calculated using Eq. (6.35) of Perryman (2011).

^(c)

Point-to-point noise.

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