55 Cancri: A Coplanar Planetary System that is Likely Misaligned with its Star
arXiv:1110.5911 · doi:10.1088/2041-8205/742/2/L24
Abstract
Although the 55 Cnc system contains multiple, closely packed planets that are presumably in a coplanar configuration, we use numerical simulations to demonstrate that they are likely to be highly inclined to their parent star's spin axis. Due to perturbations from its distant binary companion, this planetary system precesses like a rigid body about its parent star. Consequently, the parent star's spin axis and the planetary orbit normal likely diverged long ago. Because only the projected separation of the binary is known, we study this effect statistically, assuming an isotropic distribution for wide binary orbits. We find that the most likely projected spin-orbit angle is ~50 degrees, with a ~30% chance of a retrograde configuration. Transit observations of the innermost planet - 55 Cnc e - may be used to verify these findings via the Rossiter-McLaughlin effect. 55 Cancri may thus represent a new class of planetary systems with well-ordered, coplanar orbits that are inclined with respect to the stellar equator.
Accepted to ApJ Letters, 16 pages, 4 figures, 1 table
References in corpus (8)
- Formation of Hot Planets by a combination of planet scattering, tidal circularization, and Kozai mechanism
- Radial velocity planets de-aliased. A new, short period for Super-Earth 55 Cnc e
- Prospects for the Characterization and Confirmation of Transiting Exoplanets via the Rossiter-McLaughlin Effect
- Five Planets Orbiting 55 Cancri
- 55 Cancri: Stellar Astrophysical Parameters, a Planet in the Habitable Zone, and Implications for the Radius of a Transiting Super-Earth
- Planetary Systems in Binaries. I. Dynamical Classification
- A dynamical perspective on additional planets in 55 Cancri
- A Search for wide visual companions of exoplanet host stars - The Calar Alto Survey
Cited by in corpus (36)
- Friends of Hot Jupiters I: A Radial Velocity Search for Massive, Long-Period Companions to Close-In Gas Giant Planets
- Foretellings of Ragnarök: World-engulfing Asymptotic Giants and the Inheritance of White Dwarfs
- Stellar obliquities in exoplanetary systems
- Planetary System Disruption by Galactic Perturbations to Wide Binary Stars
- Friends of Hot Jupiters II: No Correspondence Between Hot-Jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions
- The 55 Cancri Planetary System: Fully Self-Consistent N-body Constraints and a Dynamical Analysis
- Stability of prograde and retrograde planets in circular binary systems
- The effects of external planets on inner systems: multiplicities, inclinations, and pathways to eccentric warm Jupiters
- Revisiting rho 1 Cancri e: A New Mass Determination Of The Transiting super-Earth
- Compact planetary systems perturbed by an inclined companion: II. Stellar spin-orbit evolution
- Detailed Abundances of Planet-Hosting Wide Binaries. I. Did Planet Formation Imprint Chemical Signatures in the Atmospheres of HD 20782/81?
- A simple scaling for the minimum instability time-scale of two widely spaced planets
- Lava Worlds: From Early Earth to Exoplanets
- The Dynamics of the Multi-planet System Orbiting Kepler-56
- Detecting the spin-orbit misalignment of the super-Earth 55 Cnc e
- Compact planetary systems perturbed by an inclined companion: I. Vectorial representation of the secular model
- Tidal dissipation and eccentricity pumping: Implications for the depth of the secondary eclipse of 55 Cnc e
- Rossiter-McLaughlin Observations of 55 Cnc e
- Outer-planet scattering can gently tilt an inner planetary system
- The gravitational interaction between planets on inclined orbits and protoplanetary disks as the origin of primordial spin--orbit misalignments
- Stars Don't Eat Their Young Migrating Planets - Empirical Constraints On Planet Migration Halting Mechanisms
- Statistical Trends in the Obliquity Distribution of Exoplanet Systems
- Teetering Stars: Resonant Excitation of Stellar Obliquities by Hot and Warm Jupiters with External Companions
- On the potentially dramatic history of the super-Earth rho 55 Cancri e
- Migration into a Companion's Trap: Disruption of Multiplanet Systems in Binaries
- The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS
- Planetary Orbital Equations in Externally-Perturbed Systems: Position and Velocity-Dependent Forces
- The Dynamics of Tightly-packed Planetary Systems in the Presence of an Outer Planet: case studies using Kepler-11 and Kepler-90
- Measured Spin-Orbit Alignment of Ultra-Short Period Super-Earth 55 Cancri e
- Resilient habitability of nearby exoplanet systems
- TOI-4336 A b: A temperate sub-Neptune ripe for atmospheric characterization in a nearby triple M-dwarf system
- Long-term Dynamical Evolution of Pallene (Saturn XXXIII) and its Diffuse, Dusty Ring
- Dynamical Fates of S-Type Planetary Systems in Embedded Cluster Environments
- Effects of capturing a wide-orbit planet on planetary systems: system stability and Habitable Zone bombardment rates
- Spin-orbit angle in compact planetary systems perturbed by an inclined companion. Application to the 55 Cancri system
- Dynamical orbital evolution scenarios of the wide-orbit eccentric planet HR 5183b