Published in
American Astronomical Society, Astronomical Journal, 6(152), p. 165, 2016
DOI: 10.3847/0004-6256/152/6/165
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Tools
The Orbit and Mass of the Third Planet in the Kepler-56 System
,
John Asher Johnson,
David Charbonneau ,
Andrew Collier-Cameron,
Andrew W. Howard,
Howard Isaacson ,
David Winslow Latham ,
Mercedes Lopez-Morales ,
Christophe Lovis,
Michel Mayor,
Giusi Micela ,
Emilio Molinari ,
Francesco Pepe,
Giampaolo Piotto
and other authors.
Full text: Download
Abstract
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. ; Publisher PDF ; Peer reviewed