A deeper view of the CoRoT-9 planetary system - A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering

A. S. Bonomo; G. Hébrard; S. N. Raymond; F. Bouchy; A. Lecavelier des Etangs; P. Bordé; S. Aigrain; J.-M. Almenara; R. Alonso; J. Cabrera; Sz. Csizmadia; C. Damiani; H. J. Deeg; M. Deleuil; R. F. Díaz; A. Erikson; M. Fridlund; D. Gandolfi; E. Guenther; T. Guillot; A. Hatzes; A. Izidoro; C. Lovis; C. Moutou; M. Ollivier; M. Pätzold; H. Rauer; D. Rouan; A. Santerne; J. Schneider

doi:10.1051/0004-6361/201730624

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Volume 603 (July 2017)

A&A, 603 (2017) A43

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Table 2

CoRoT-9 system parameters.

Stellar parameters

Stellar mass [M_⊙]	0.96 ± 0.04
Stellar radius [R_⊙]	0.96 ± 0.06
Stellar density ρ_∗ [gcm^-3]	1.51 ± 0.30
Age t [Gyr]	6 ± 3
Effective temperature T_eff [K]^a	5625 ± 80
Stellar surface gravity log g [cgs]^a	4.54 ± 0.09
Stellar metallicity [Fe/H] [dex]^a	–0.01 ± 0.06
Stellar rotational velocity Vsini_∗ [ km s^-1]^a	< 3.5
CoRoT limb-darkening coefficient q₁
CoRoT limb-darkening coefficient q₂
CoRoT limb-darkening coefficient u_a	0.41 ± 0.09
CoRoT limb-darkening coefficient u^b	0.22 ± 0.17
Spitzer limb-darkening coefficient q₁
Spitzer limb-darkening coefficient q₂
Spitzer limb-darkening coefficient u_a
Spitzer limb-darkening coefficient u_b
Systemic velocity V_r [ km s^-1]	19.8150 ± 0.0017
Radial-velocity jitter s_j [ m s^-1]	< 3.9

Transit and orbital parameters

Orbital period P [d]	95.272656 ± 0.000068
Transit epoch T₀ [ BJD_TDB−2 450 000]^b	5365.52723 ± 0.00037
Transit duration T₁₄ [d]
CoRoT bandpass radius ratio R_p/R_∗^c
Spitzer bandpass radius ratio R_p/R_∗^c
Inclination i [deg]
a/R_∗	89.9 ± 5.9
Impact parameter b


Orbital eccentricity e
Argument of periastron ω [deg]
Radial-velocity semi-amplitude K [ m s^-1]	39.0 ± 2.4

Planetary parameters

Planet mass M_p [M_Jup]	0.84 ± 0.05
Planet radius R_p [R_Jup]
Planet density ρ_p [gcm^-3]
Planet surface gravity log g_p [cgs]	3.26 ± 0.06
Orbital semimajor axis a [AU]	0.4021 ± 0.0054
Equilibrium temperature T_eq [K]^d	420 ± 16

Notes.

^(a)

Values from D10.

^(b)

In the planet-reference frame.

^(c)

Two dilution factors were fitted along with the radius ratios for the transits observed by Spitzer in 2010 and CoRoT in 2011 (see text for more details); their values were found to be 13.2 ± 1.5% (Spitzer) and < 0.4% (CoRoT).

^(d)

Black-body equilibrium temperature assuming a null Bond albedo and uniform heat redistribution to the nightside.

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