Kepler-34b

Kepler-34b (formally Kepler-34(AB)b) is a circumbinary planet announced with Kepler-35b. It is a small gas giant that orbits every ~288 days around two stars. Despite the planet's relatively long orbital period, its existence could be confirmed quickly due to transiting both of its host stars.

Kepler-34b
Discovery
Discovery date01-11-2012
Transit (Kepler Mission)
Orbital characteristics
Epoch BJD 2454969.2000
1.0896 ± 0.0009 AU (163,000,000 ± 130,000 km)
Eccentricity0.182 +0.0016
−0.0020
288.822 +0.063
−0.081 d
Inclination90.355 +0.026
−0.018
−1.74 +0.14
−0.16
106.5 +2.5
−2.0
StarKepler-34
Physical characteristics
Mean radius
0.764 +0.0012
−0.0014 RJ
8.56 R⊕
Mass0.220 +0.011
−0.010 MJ
(69.9 M⊕)
Mean density
0.613 +0.045
−0.041 g cm−3
936 +57
−54 m/s²
Temperature323

    The Kepler-34b is unlikely to form at the current orbit, and likely migrated early from birth orbit beyond 1.5 AU away from parent binary stars, suffering multiple giant impacts in the process.[1] The eccentricity of planetary orbit may be acquired on the last stage of migration, due to interaction with the residual debris disk,[2] or by ejection of the second planet.[3]

    References
    1. FORMING CIRCUMBINARY PLANETS: N-BODY SIMULATIONS OF KEPLER-34, 2014, arXiv:1402.0509
    2. Migration and gas accretion scenarios for the Kepler 16, 34 and 35 circumbinary planets, 2013, arXiv:1307.0713
    3. THE SCATTERING OUTCOMES OF KEPLER CIRCUMBINARY PLANETS: PLANET MASS RATIO, 2017, arXiv:1709.04433
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