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Spin-orbit angle in compact planetary systems perturbed by an inclined companion. Application to the 55 Cancri system

Published online by Cambridge University Press:  05 January 2015

Gwenaël Boué  and
Daniel C. Fabrycky
Gwenaël Boué
Affiliation:
Sorbonne Universités, UPMC Univ Paris 06, UMR 8028, ASD-IMCCE, Observatoire de Paris, F-75014 Paris, France email: boue@imcce.fr
Daniel C. Fabrycky
Affiliation:
Department of Astronomy and Astrophysics, University of Chicago, 5640 South Ellis Avenue, Chicago, IL 60637, USA email: fabrycky@uchicago.edu
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Abstract

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The stellar spin orientation relative to the orbital planes of multiplanet systems are becoming accessible to observations. For example, 55 Cancri is a system composed of 5 planets orbiting a member of a stellar binary for which a projected obliquity of 72±12 ° relative to the orbit of the innermost planet has been reported (Bourrier & Hébrard 2014). This large obliquity has been attributed to the perturbation induced by the binary. Here we describe the secular evolution of similar systems and we discuss the case of the 55 Cancri system more deeply. We provide two different orbital configurations compatible with the currently available observations.

Keywords

celestial mechanicsmethods: analyticalstars: planetary systemsstars: rotationstars: binaries: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S310: Complex Planetary Systems , July 2014 , pp. 62 - 65
Copyright
Copyright © International Astronomical Union 2014 

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