Constellations of co-orbital planets: horseshoe dynamics, long-term stability, transit timing variations, and potential as SETI beacons
arXiv:2304.09209 · doi:10.1093/mnras/stad643
Abstract
Co-orbital systems contain two or more bodies sharing the same orbit around a planet or star. The best-known flavors of co-orbital systems are tadpoles (in which two bodies' angular separations oscillate about the L4/L5 Lagrange points apart) and horseshoes (with two bodies periodically exchanging orbital energy to trace out a horseshoe shape in a co-rotating frame). Here, we use N-body simulations to explore the parameter space of many-planet horseshoe systems. We show that up to 24 equal-mass, Earth-mass planets can share the same orbit at 1 au, following a complex pattern in which neighboring planets undergo horseshoe oscillations. We explore the dynamics of horseshoe constellations, and show that they can remain stable for billions of years and even persist through their stars' post-main sequence evolution. With sufficient observations, they can be identified through their large-amplitude, correlated transit timing variations. Given their longevity and exotic orbital architectures, horseshoe constellations may represent potential SETI beacons.
arXiv comment10 pages, 10 figures. Published in MNRAS. YouTube playlist with animations of horseshoe constellation systems here: https://www.youtube.com/playlist?list=PLelMZVM3ka3F335LGLxkxrD1ieiLJYQ5N . Blog post here: https://planetplanet.net/2023/04/20/constellations-of-co-orbital-planets/
References in corpus (39)
- Comprehensive analytic formulae for stellar evolution as a function of mass and metallicity
- DHP Framework: Digital Health Passports Using Blockchain -- Use case on international tourism during the COVID-19 pandemic
- On detecting terrestrial planets with timing of giant planet transits
- The taxonomic distribution of asteroids from multi-filter all-sky photometric surveys
- Breaking the Chains: Hot Super-Earth systems from migration and disruption of compact resonant chains
- The Great Escape: How Exoplanets and Smaller Bodies Desert Dying Stars
- An Upper Limit on the Albedo of HD 209458b: Direct Imaging Photometry with the MOST Satellite
- Standing on the shoulders of giants: Trojan Earths and vortex trapping in low mass self-gravitating protoplanetary disks of gas and solids
- Extrasolar Trojans: The Viability and Detectability of Planets in the 1:1 Resonance
- Unstable low-mass planetary systems as drivers of white dwarf pollution
- Using Transit Timing Observations to Search for Trojans of Transiting Extrasolar Planets
- Measurement of planet masses with transit timing variations due to synodic "chopping" effects
- Migration-driven diversity of super-Earth compositions
- Observational Constraints on Trojans of Transiting Extrasolar Planets
- Mercury-T: A new code to study tidally evolving multi-planet systems. Applications to Kepler-62
- Empirical Constraints on Trojan Companions and Orbital Eccentricities in 25 Transiting Exoplanetary Systems
- Long-Term Stability of Horseshoe Orbits
- Liberating exomoons in white dwarf planetary systems
- Origin and Detectability of coorbital planets from radial velocity data
- Detection of Earth-mass and Super-Earth Trojan Planets Using Transit Timing Variation Method
- Asteroid 2015 DB216: a recurring co-orbital companion to Uranus
- On the growth and stability of Trojan planets
- Tidal evolution of close-in exoplanets in co-orbital configurations
- Born eccentric: constraints on Jupiter and Saturn's pre-instability orbits
- The TROY project: Searching for co-orbital bodies to known planets. I. Project goals and first results from archival radial velocity
- Asteroid 2013 ND15: Trojan companion to Venus, PHA to the Earth
- Detectability of quasi-circular co-orbital planets. Application to the radial velocity technique
- The TROY project: II. Multi-technique constraints on exotrojans in nine planetary systems
- Dynamical mass and multiplicity constraints on co-orbital bodies around stars
- Transit timing variations for planets coorbiting in the horseshoe regime
- Disruption of co-orbital (1:1) planetary resonances during gas-driven orbital migration
- Coorbital Satellites of Saturn: Congenital Formation
- An analytical model for tidal evolution in co-orbital systems I. Application to exoplanets
- Co-orbital Oligarchy
- OSSOS. XXIII. 2013 VZ70 and the Temporary Coorbitals of the Giant Planet
- Mathematical encoding within multi-resonant planetary systems as SETI beacons
- Do Tides Destabilize Trojan Exoplanets?
- Primordial migration of co-orbital satellites as a mechanism for the horseshoe orbit of Janus-Epimetheus
- Radial Velocities of Stars with Multiple Co-orbital Planets