Were planetesimals formed by dust accretion in the solar nebula?

Minoru Sekiya, Hidenori Takeda

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

The growth of meter-sized bodies in the solar nebula by dust accretion is examined. The meter-sized bodies have velocity about 50 m/s relative to the gas and small dust aggregates. When a small dust aggregate hits a meter-sized body, the aggregate breaks into dust monomers. These monomers accrete onto the body after several bouncing as proposed by Wurm et al., Icarus (2001), if the mean free path of the gas molecules is larger than the radius of the body. On the other hand, the monomers never hit the surface of the body again, if the body is much larger than the mean free path of the molecules. The sizes of bodies would be limited to the order of 10 times the mean free path. Kilometer-sized planetesimals were hardly formed by dust accretion in the region within 5 AU from the sun where the mean free path is less than 1 m. The planetesimals were probably formed by the gravitational instabilities in this region.

Original languageEnglish
Pages (from-to)263-269
Number of pages7
Journalearth, planets and space
Volume55
Issue number5
DOIs
Publication statusPublished - Jan 1 2003

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solar nebula
protoplanets
planetesimal
dust
accretion
mean free path
monomers
gas
gravitational instability
gases
molecules
sun
radii

All Science Journal Classification (ASJC) codes

  • Geology
  • Space and Planetary Science

Cite this

Were planetesimals formed by dust accretion in the solar nebula? / Sekiya, Minoru; Takeda, Hidenori.

In: earth, planets and space, Vol. 55, No. 5, 01.01.2003, p. 263-269.

Research output: Contribution to journalArticle

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