The Orbit and Mass of the Third Planet in the Kepler-56 System
Journal
Date Issued
2016
Author(s)
Otor, Oderah Justin
•
Montet, Benjamin T.
•
Johnson, John Asher
•
Charbonneau, David
•
Collier-Cameron, Andrew
•
Howard, Andrew W.
•
Isaacson, Howard
•
Latham, David W.
•
Lopez-Morales, Mercedes
•
Lovis, Christophe
•
Mayor, Michel
•
•
•
Pepe, Francesco
•
Piotto, Giampaolo
•
Phillips, David F.
•
Queloz, Didier
•
Rice, Ken
•
Sasselov, Dimitar
•
Ségransan, Damien
•
•
Udry, Stéphane
•
Watson, Chris
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 {M}{Jup}. 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.
Volume
152
Issue
6
Start page
165
Issn Identifier
0004-6256
Ads BibCode
2016AJ....152..165O
Rights
open.access
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