Kepler-539: A young extrasolar system with two giant planets on wide orbits and in gravitational interaction

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Volume 590 (June 2016)

A&A, 590 (2016) A112

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Table 3

Final parameters of the planetary system KOI-0372.

Parameter	Nomen.	Unit	Value^a

Stellar parameters
RA (J2000) .....................................			19^h56^m29:39^s
Dec (J2000) .....................................			41°52′00.3′′
Spectral type^b .....................................	...........................	...........................	G2 V
Kepler magnitude .....................................	......... K_p .........	.........mag.........	12.39
Effective temperature .....................................	......... T_eff .........	.........K.........	5820 ± 80
Iron abundance .....................................	......... [Fe/H] .........	.........dex.........	−0.01 ± 0.07
Lithium abundance .....................................	.........A(Li).........	.........dex.........	2.5 ± 0.1
Microturb. velocity .....................................	......... v _micro .........	......... km s^-1.........	1.1 ± 0.1
Macroturb. velocity^c .....................................	......... v _macro.........	......... km s^-1.........	3.2 ± 0.6
Proj. rotat. velocity .....................................	......... v sini_⋆ .........	......... km s^-1.........	4.4 ± 0.5
Stellar rotation period^d .....................................	......... P _rot .........	.........day.........	11.769 ± 0.016
Stellar age (from gyrochronology)	...........................	.........Gyr.........	1.0 ± 0.3
Stellar age (from isochrones) .........	...........................	.........Gyr.........
Stellar mass .....................................	......... M _⋆ .........	......... M _⊙ .........	1.048 ± 0.034 ± 0.025
Stellar radius .....................................	......... R _⋆ .........	......... R_⊙ .........	0.952 ± 0.017 ± 0.007
Stellar mean density .....................................	......... ρ _⋆ .........	......... ρ_⊙ .........	1.216 ± 0.054
Stellar surface gravity .....................................	......... log g_⋆ .........	.........cgs.........	4.502 ± 0.014 ± 0.003


Planetary parameters (Kepler-539 b)
Planetary mass .....................................	......... M_b .........	......... M_Jup ......... .........	0.97 ± 0.29 ± 0.02
Planetary radius .....................................	......... R_b .........	......... R_Jup ......... .........	0.747 ± 0.016 ± 0.006
Planetary mean density .....................................	......... ρ_b .........	......... ρ_Jup ......... .........	2.18 ± 0.66 ± 0.02
Planetary surface gravity .....................................	......... g_b .........	......... m s^-2.........	43 ± 12
Planetary equilibrium temperature	......... T_eq .........	.........K.........	387.6 ± 6.0
Safronov number .....................................	......... Θ .........		1.24 ± 0.37 ± 0.01


Orbital parameters
Time of mid-transit .....................................	......... T₀ .........	.........BJD_TDB.........	2 455 588.8710 ± 0.0030
Orbital period .....................................	......... P_orb .........	.........days.........	125.63243 ± 0.00071
Semi-major axis .....................................	......... a .........	.........au.........	0.4988 ± 0.0054 ± 0.0039
Orbital inclination .....................................	......... i .........	.........deg.........	89.845 ± 0.086
Fractional star radius .....................................	......... r_A .........	..................	0.01057 ± 0.00078
Fractional planet radius .....................................	......... r_b .........	..................	0.000854 ± 0.000085
RV semi-amplitude .....................................	......... K_A .........	.........m s^-1.........	132.3 ± 6.3
Barycentric RV .....................................	......... γ .........	.........km s^-1.........	9.959 ± 0.007
Eccentricity .....................................	......... e .........		<0.39^e

Notes. Where there are two error bars, the first is a statistical error, coming from the measured spectroscopic and photometric parameters, while the second is a systematic error and is given only for those parameters which have a dependence on theoretical stellar models.

^(a)

The adopted parameters assume a circular orbit.

^(b)

With an accuracy of ± 1 sub-class.

^(c)

Using the calibration equations of Doyle et al. (2014).

^(d)

From McQuillan et al. (2013).

^(e)

The 99% confidence upper limit on the eccentricity from a model in which the eccentricity is allowed to vary in the fit.

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