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20 April 2024

» arxiv » 1608.3627

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The Orbit and Mass of the Third Planet in the Kepler-56 System
Oderah Justin Otor ; Benjamin T. Montet ; John Asher Johnson ; David Charbonneau ; Andrew Collier-Cameron ; Andrew W. Howard ; Howard Isaacson ; David W. Latham ; Mercedes Lopez-Morales ; Christophe Lovis ; Michel Mayor ; Giusi Micela ; Emilio Molinari ; Francesco Pepe ; Giampaolo Piotto ; David F. Phillips ; Didier Queloz ; Ken Rice ; Dimitar Sasselov ; Damien Ségransan ; Alessandro Sozzetti ; Stéphane Udry ; Chris Watson ;
Date:	12 Aug 2016
Abstract:	While the vast majority of multiple-planet systems have their orbital angular momentum axes aligned with the spin axis of their host star, Kepler-56 is an exception: its two transiting planets are coplanar yet misaligned by at least 40 degrees with respect to their host star. Additional follow-up observations of Kepler-56 suggest the presence of a massive, non-transiting companion that may help explain this misalignment. We model the transit data along with Keck/HIRES and HARPS-N radial velocity data to update the masses of the two transiting planets and infer the physical properties of the third, non-transiting planet. We employ a Markov Chain Monte Carlo sampler to calculate the best-fitting orbital parameters and their uncertainties for each planet. We find the outer planet has a period of 1002 $pm$ 5 days and minimum mass of 5.61 $pm$ 0.38 Jupiter masses. We also place a 95% upper limit of 0.80 m/s/yr on long-term trends caused by additional, more distant companions.
Source:	arXiv, 1608.3627
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