The orbit and mass of the third planet in the Kepler-56 system
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While the vast majority of multiple-planet systems have orbital angular momentum axes that align 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° with respect to the rotation axis of 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 ± 5 days and minimum mass of 5.61 ± 0.38 MJup . We also place a 95% upper limit of 0.80 m s-1 yr-1 on long-term trends caused by additional, more distant companions.
Otor , O J , Montet , B T , Johnson , J A , Charbonneau , D , Collier Cameron , A , Howard , A W , Isaacson , H , Latham , D W , Lopez-Morales , M , Lovis , C , Mayor , M , Micela , G , Molinari , E , Pepe , F , Piotto , G , Phillips , D F , Queloz , D , Rice , K , Sasselov , D , Ségransan , D , Sozzetti , A , Udry , S & Watson , C 2016 , ' The orbit and mass of the third planet in the Kepler-56 system ' , Astronomical Journal , vol. 152 , no. 6 , 165 . https://doi.org/10.3847/0004-6256/152/6/165
© 2016. The American Astronomical Society. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at: https://dx.doi.org/10.3847/0004-6256/152/6/165
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