Extrasolar comets: The origin of dust in exozodiacal disks?

摘要: Abstract Comets have been invoked in numerous studies as a potentially important source of dust and gas around stars, but none has studied the thermo-physical evolution, out-gassing rate, ejection these objects such stellar systems. In this paper we investigate evolution comets exo-planetary systems order to provide valuable theoretical data required interpret observations dust. We use quasi-3D model cometary nucleus study evolving single star from 0.1 50 AU, whose homogeneous luminosity varies 70 L ⊙ . This provides thermal physical alteration, mass ejection, lifetimes, rate water productions for function distance luminosity. Results show significant changes at high luminosities. The loss per revolution lifetime depend on their initial size, orbital parameters follow power law with models are presented manner that they can be readily applied any planetary system. By considering examples Solar System, Vega HD 69830, grains released sublimating potential create observed (exo)zodiacal emission. reproduced by 1 2 massive or large number orbits approach close star. Our conclusions uncertain grains. find, previous studies, exozodiacal disks only survive if replenished population typically sized renewed cold reservoir bodies beyond ice line. These could reach inner regions system following scattering (giant) planet.