Scattering of small bodies by planets: a potential origin for exozodiacal dust ?

Abstract

High levels of exozodiacal dust are observed around a growing number of main sequence stars. The origin of such dust is not clear, given that it has a short lifetime against both collisions and radiative forces. Even a collisional cascade with km-sized parent bodies, as suggested to explain outer debris discs, cannot survive sufficiently long. In this work we investigate whether the observed exozodiacal dust could originate from an outer planetesimal belt. We investigate the scattering processes in stable planetary systems in order to determine whether sufficient material could be scattered inwards in order to retain the exozodiacal dust at its currently observed levels. We use N-body simulations to investigate the efficiency of this scattering and its dependence on the architecture of the planetary system. The results of these simulations can be used to assess the ability of hypothetical chains of planets to produce exozodi in observed systems. We find that for older (>100Myr) stars with exozodiacal dust, a massive, large radii (>20AU) outer belt and a chain of tightly packed, low-mass planets would be required in order to retain the dust at its currently observed levels. This brings into question how many, if any, real systems possess such a contrived architecture and are therefore capable of scattering at sufficiently high rates to retain exozodi dust on long timescales.

References in corpus (14)

• Transience of hot dust around sun-like stars
• Spitzer IRS Spectroscopy of IRAS-Discovered Debris Disks
• Long-Term Collisional Evolution of Debris Disks
• Collisional processes and size distribution in spatially extended debris discs
• Abundant Circumstellar Silica Dust and SiO Gas Created by a Giant Hypervelocity Collision in the ~12 Myr HD172555 System
• Circumstellar material in the Vega inner system revealed by CHARA/FLUOR
• Debris from terrestrial planet formation: the Moon-forming collision
• Temporal Evolution of Coronagraphic Dynamic Range, and Constraints on Companions to Vega
• Herschel images of Fomalhaut. An extrasolar Kuiper Belt at the height of its dynamical activity
• A near-infrared interferometric survey of debris disk stars. I. Probing the hot dust content around epsilon Eridani and tau Ceti with CHARA/FLUOR
• Collisional and Thermal Emission Models of Debris Disks: Towards Planetesimal Population Properties
• A near-infrared interferometric survey of debris disc stars. II. CHARA/FLUOR observations of six early-type dwarfs
• Resolved debris disk emission around eta Tel: a young Solar System or ongoing planet formation?
• Coronagraphic Search for Extra-Solar Planets around epsilon Eri and Vega

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• The short-lived production of exozodiacal dust in the aftermath of a dynamical instability in planetary systems
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• LIDT-DD: A new self-consistent debris disc model including radiation pressure and coupling collisional and dynamical evolution
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• Polarization measurements of hot dust stars and the local interstellar medium
• Near-infrared emission from sublimating dust in collisionally active debris disks
• Warm exo-Zodi from cool exo-Kuiper belts: the significance of P-R drag and the inference of intervening planets
• Exocomets from a Solar System Perspective
• Does warm debris dust stem from asteroid belts?
• Polluting White Dwarfs with Perturbed Exo-Comets
• Hot circumstellar material resolved around beta Pic with VLTI/PIONIER
• A new sample of warm extreme debris disks from the ALLWISE catalog
• Scattering of exocomets by a planet chain: exozodi levels and the delivery of cometary material to inner planets
• Dust size and spatial distributions in debris discs: predictions for exozodiacal dust dragged in from an exo-Kuiper belt
• Dust Populations in the Iconic Vega Planetary System Resolved by ALMA
• Extrasolar comets : the origin of dust in exozodiacal disks?
• A near-infrared interferometric survey of debris-disk stars. VII. The hot/warm dust connection
• What Sets the Radial Locations of Warm Debris Disks?
• Probing the Terrestrial Regions of Planetary Systems: Warm Debris Disks with Emission Features
• Hot exozodiacal dust: an exocometary origin?
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• Transient events in bright debris discs: Collisional avalanches revisited
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• Can tidal evolution lead to close-in planetary bodies around white dwarfs II: volcanism and transits
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