Debris Disks: Probing Planet Formation

Living reference work entry

Abstract

Debris disks are the dust disks found around ∼20% of nearby main sequence stars in far-IR surveys. They can be considered as descendants of protoplanetary disks or components of planetary systems, providing valuable information on circumstellar disk evolution and the outcome of planet formation. The debris disk population can be explained by the steady collisional erosion of planetesimal belts; population models constrain where (10–100 au) and in what quantity (>1M) planetesimals (>10 km in size) typically form in protoplanetary disks. Gas is now seen long into the debris disk phase. Some of these are secondary implying planetesimals have a solar system comet-like composition, but some systems may retain primordial gas. Ongoing planet formation processes are invoked for some debris disks, such as the continued growth of dwarf planets in an unstirred disk or the growth of terrestrial planets through giant impacts. Planets imprint structure on debris disks in many ways; images of gaps, clumps, warps, eccentricities and other disk asymmetries are readily explained by planets at ≫5 au. Hot dust in the region planets are commonly found (<5 au) is seen for a growing number of stars. This dust usually originates in an outer belt (e.g., from exocomets), although an asteroid belt or recent collision is sometimes inferred.

Keywords

Circumstellar disks Planet formation Debris disks Extrasolar planets Exocomets 

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Copyright information

© Springer International Publishing AG 2018

Authors and Affiliations

  1. 1.Institute of AstronomyUniversity of CambridgeCambridgeUK

Section editors and affiliations

  • Ralph Pudritz
    • 1
  1. 1.Origins InstituteMcMaster UniversityHamiltonCanada

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