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Dust ring formation due to sublimation of dust grains drifting radially inward by the Poynting-Robertson drag: An analytical model

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Title: Dust ring formation due to sublimation of dust grains drifting radially inward by the Poynting-Robertson drag: An analytical model
Authors: Kobayashi, Hiroshi Browse this author
Watanabe, Sei-ichiro Browse this author
Kimura, Hiroshi Browse this author
Yamamoto, Tetsuo Browse this author →KAKEN DB
Keywords: Celestial mechanics
Interplanetary dust
Debris disk
Issue Date: May-2009
Publisher: Elsevier Inc.
Journal Title: Icarus
Volume: 201
Issue: 1
Start Page: 395
End Page: 405
Publisher DOI: 10.1016/j.icarus.2009.01.002
Abstract: Dust particles exposed to the stellar radiation and wind drift radially inward by the Poynting-Robertson (P-R) drag and pile up at the zone where they begin to sublime substantially. The reason they pile up or form a ring is that their inward drifts due to the P-R drag are Suppressed by stellar radiation pressure when the ratio of radiation pressure to stellar gravity on them increases during their sublimation phases. We present analytic solutions to the orbital and mass evolution of such subliming dust particles, and find their drift velocities at the pileup Zone are almost independent of their initial semimajor axes and masses. We derive analytically all enhancement factor of the number density of the particles from their drift velocities at the outer edge of the sublimation zone. We show that the formula of the enhancement factor reproduces well numerical simulations in the previous studies. The enhancement factor for spherical dust particles of silicate and carbon extends from 3 to more than 20 at stellar luminosities L-star = 0.8-500L(circle dot)., where L-circle dot) is solar luminosity. Although the enhancement factor for fluffy dust particles is smaller than that for spherical particles, sublimating particles inevitably form a dust ring as long as their masses decrease faster than their surface areas during sublimation. The formulation is applicable to dust ring formation for arbitrary shape and material of dust in dust-debris disks as well as in the Solar System.
Type: article (author version)
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本 哲生

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