Debris Disks: Probing Planet Formation

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 (10-100au) and in what quantity (>1Mearth) planetesimals (>10km in size) typically form in protoplanetary disks. Gas is now seen long into the debris disk phase. Some of this is 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 >>5au. Hot dust in the region planets are commonly found (<5au) 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.

Invited review, accepted for publication in the 'Handbook of Exoplanets', eds. H.J. Deeg and J.A. Belmonte, Springer (2018)

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Cited by in corpus (9)

• Self-Stirring of Debris Discs by Planetesimals Formed by Pebble Concentration
• Formation of Gaps in Self-Gravitating Debris Disks by Secular Resonance in a Single-planet System I: A Simplified Model
• A $75\%$ Occurrence Rate of Debris Discs around F stars in the $\beta$ Pic Moving Group
• Formation of the polar debris disc around 99 Herculis
• Dust Spreading in Debris Discs: Do Small Grains Cling on to Their Birth Environment?
• The high-albedo, low polarization disk around HD 114082 harbouring a Jupiter-sized transiting planet
• A Mixed Stirring Mechanism for Debris Discs with Giant and Dwarf Planetary Perturbations
• Searching for Planets Orbiting Vega with the James Webb Space Telescope
• The search for gas in debris discs: ALMA detection of CO gas in HD 36546