The fragility of planetary systems
| Autor: | S.F. Portegies Zwart, Lucie Jílková |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
010504 meteorology & atmospheric sciences
planets and satellites: dynamical evolution and stability FOS: Physical sciences Astrophysics minor planets asteroids: general 01 natural sciences Kepler-47 stars: individual: WISE J072003.20-084651.2 Planet 0103 physical sciences planet-star interactions 010303 astronomy & astrophysics 2012VP(133) Astrophysics::Galaxy Astrophysics 0105 earth and related environmental sciences Planetary migration Physics Earth and Planetary Astrophysics (astro-ph.EP) Velocity dispersion Astronomy Astronomy and Astrophysics Planetary system planets and satellites: individual: Sedna asteroids: general Star cluster 13. Climate action Space and Planetary Science Globular cluster minor planets Astrophysics::Earth and Planetary Astrophysics planets and satellites: individual: Sedna 2012VP(133) Open cluster Astrophysics - Earth and Planetary Astrophysics |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 451(1), 144-148 |
| Popis: | We specify the range to which perturbations penetrate a planetesimal system. Such perturbations can originate from massive planets or from encounters with other stars. The latter can have an origin in the star cluster in which the planetary system was born, or from random encounters once the planetary system has escaped its parental cluster. The probability of a random encounter, either in a star cluster or in the Galactic field depends on the local stellar density, the velocity dispersion and the time spend in that environment. By adopting order of magnitude estimates we argue that the majority of planetary systems born in open clusters will have a {\em Parking zone}, in which planetesimals are affected by encounters in their parental star cluster but remain unperturbed after the star has left the cluster. Objects found in this range of semi-major axis and eccentricity preserve the memory of the encounter that last affected their orbits, and they can therefore be used to reconstruct this encounter. Planetary systems born in a denser environment, such as in a globular cluster are unlikely to have a Parking zone. We further argue that some planetary systems may have a {\em Frozen zone}, in which orbits are not affected either by the more inner massive planets or by external influences. Objects discovered in this zone will have preserved information about their formation in their orbital parameters. 4 pages, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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