Evidence for Pebbles in Comets
arXiv:1509.00754 · doi:10.1016/j.icarus.2015.08.017
Abstract
When the EPOXI spacecraft flew by Comet 103P/Hartley 2, it observed large particles floating around the comet nucleus. These particles are likely low-density, centimeter- to decimeter-sized clumps of ice and dust. While the origin of these objects remains somewhat mysterious, it is possible that they are giving us important information about the earliest stages of our Solar System's formation. Recent advancements in planet formation theory suggest that planetesimals (or cometestimals) may grow directly from the gravitational collapse of aerodynamically concentrated small particles, often referred to as "pebbles." Here we show that the particles observed in the coma of 103P are consistent with the sizes of pebbles expected to efficiently form planetesimals in the region that this comet likely formed, while smaller pebbles are may be expected in the majority of comets, whose chemistry is often indicative of formation in the colder, outer regions of the protoplanetary disk.
References in corpus (14)
- Protoplanetary Disk Structures in Ophiuchus
- Origin of the Structure of the Kuiper Belt during a Dynamical Instability in the Orbits of Uranus and Neptune
- Towards planetesimals: dense chondrule clumps in the protoplanetary nebula
- The structure of protoplanetary discs around evolving young stars
- How to form planetesimals from mm-sized chondrules and chondrule aggregates
- Comets formed in solar-nebula instabilities! -- An experimental and modeling attempt to relate the activity of comets to their formation process (corrigendum included)
- Embryos grown in the dead zone: Assembling the first protoplanetary cores in low mass self-gravitating circumstellar disks of gas and solids
- Formation of pebble-pile planetesimals
- Assembling the Building Blocks of Giant Planets around Intermediate Mass Stars
- CO2 formation in quiescent clouds; an experimental study of the CO + OH pathway
- What drives the dust activity of comet 67P/Churyumov-Gerasimenko?
- Outburst activity in comets: II. A multi-band photometric monitoring of comet 29p/Schwassmann-Wachmann 1
- The Dust Trail of Comet 67P/Churyumov-Gerasimenko
- WWW Database of Models of Accretion Disks Irradiated by The Central Star
Cited by in corpus (7)
- Dust evolution in protoplanetary discs and the formation of planetesimals. What have we learned from laboratory experiments?
- The role of pebble fragmentation in planetesimal formation II. Numerical simulations
- Migration processes in the Solar System and their role in the evolution of the Earth and planets
- Forming the Cold Classical Kuiper Belt in a light Disk
- Formation of trans-Neptunian satellite systems at the stage of condensations
- Migration of celestial bodies in the Solar system and in several exoplanetary systems
- Predictions for Dusty Mass Loss from Asteroids during Close Encounters with Solar Probe Plus