A dynamical perspective on additional planets in 55 Cancri
Sean N. Raymond, Rory Barnes, Noel Gorelick

TL;DR
This study explores the potential existence and stability of additional planets in the 55 Cancri system using n-body simulations, identifying stable zones and resonances that could host undiscovered planets.
Contribution
It provides a dynamical analysis of possible additional planets in 55 Cancri, constraining their masses and orbits based on stability and resonance considerations.
Findings
A large stable zone exists between 0.9 and 3.8 AU.
Certain mean motion resonances cannot host additional planets.
The stable zone could contain 2-3 planets around 50 Earth masses.
Abstract
Five planets are known to orbit the star 55 Cancri. The recently-discovered planet f at 0.78 AU (Fischer et al. 2008) is located at the inner edge of a previously-identified stable zone that separates the three close-in planets from planet d at 5.9 AU. Here we map the stability of the orbital space between planets f and d using a suite of n-body integrations that include an additional, yet-to-be-discovered planet g with a radial velocity amplitude of 5 m/s (planet mass = 0.5-1.2 Saturn masses). We find a large stable zone extending from 0.9 to 3.8 AU at eccentricities below 0.4. For each system we quantify the probability of detecting planets b-f on their current orbits given perturbations from hypothetical planet g, in order to further constrain the mass and orbit of an additional planet. We find that large perturbations are associated with specific mean motion resonances (MMRs) with…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
