TY - JOUR
T1 - The 55 Cancri planetary system
T2 - Fully self-consistent N-body constraints and a dynamical analysis
AU - Nelson, Benjamin E.
AU - Ford, Eric B.
AU - Wright, Jason T.
AU - Fischer, Debra A.
AU - Braun, Kaspar von
AU - Howard, Andrew W.
AU - Payne, Matthew J.
AU - Dindar, Saleh
PY - 2014
Y1 - 2014
N2 - 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°6°. 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.
AB - 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°6°. 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.
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U2 - 10.1093/mnras/stu450
DO - 10.1093/mnras/stu450
M3 - Article
AN - SCOPUS:84900000978
SN - 0035-8711
VL - 441
SP - 442
EP - 451
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -