The 55 Cancri planetary system: Fully self-consistent N-body constraints and a dynamical analysis

Benjamin E. Nelson, Eric B. Ford, Jason T. Wright, Debra A. Fischer, Kaspar von Braun, Andrew W. Howard, Matthew J. Payne, Saleh Dindar

Research output: Contribution to journalArticlepeer-review

51 Scopus citations

Abstract

We present an updated study of the planets known to orbit 55 Cancri A using 1 418 highprecision radial velocity observations from four observatories (Lick, Keck, Hobby-Eberly Telescope, Harlan J. Smith Telescope) and transit time/durations for the inner-most planet, 55 Cancri 'e' (Winn et al. 2011). We provide the first posterior sample for the masses and orbital parameters based on self-consistent N-body orbital solutions for the 55 Cancri planets, all of which are dynamically stable (for at least 108 yr). We apply a GPU version of Radial velocity Using N-body Differential evolution Markov Chain Monte Carlo (RUN DMC; Nelson, Ford & Payne) to perform a Bayesian analysis of the radial velocity and transit observations. Each of the planets in this remarkable system has unique characteristics. Our investigation of high-cadence radial velocities and priors based on space-based photometry yields an updated mass estimate for planet 'e' (8.09 ± 0.26 M), which affects its density (5.51±1.001.32 g cm-3) and inferred bulk composition. Dynamical stability dictates that the orbital plane of planet 'e' must be aligned to within 60° of the orbital plane of the outer planets (which we assume to be coplanar). The mutual interactions between the planets 'b' and 'c' may develop an apsidal lock about 180°. We find 36-45 per cent of all our model systems librate about the anti-aligned configuration with an amplitude of 51°±10°. Other cases showed short-term perturbations in the libration of ωb - ωc, circulation, and nodding, but we find the planets are not in a 3:1 mean-motion resonance. A revised orbital period and eccentricity for planet 'd' pushes it further towards the closest known Jupiter analogue in the exoplanet population.

Original languageEnglish (US)
Pages (from-to)442-451
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume441
Issue number1
DOIs
StatePublished - 2014

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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