TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 63 (No. 10), pp. 1067-1075, 2011

Sublimation temperature of circumstellar dust particles and its importance for dust ring formation

Hiroshi Kobayashi1, Hiroshi Kimura2, Sei-ichiro Watanabe3, Tetsuo Yamamoto4, and Sebastian Müller1

1Astrophysical Institute and University Observatory, Friedrich Schiller University Jena, Schillergaesschen 2-3, 07745 Jena, Germany
2Center for Planetary Science, c/o Integrated Research Center of Kobe University, Chuo-ku Minatojima Minamimachi 7-1-48, Kobe 650-0047, Japan
3Department of Earth and Planetary Sciences, Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan
4Institute of Low Temperature Science, Hokkaido University, Kita-Ku Kita 19 Nishi 8, Sapporo 060-0819, Japan

(Received November 10, 2010; Accepted March 10, 2011; Online published February 2, 2012)

Abstract: Dust particles in orbit around a star drift toward the central star by the Poynting-Robertson effect and pile up by sublimation. We analytically derive the pile-up magnitude, adopting a simple model for optical cross sections. As a result, we find that the sublimation temperature of drifting dust particles plays the most important role in the pile-up rather than their optical property does. Dust particles with high sublimation temperature form a significant dust ring, which could be found in the vicinity of the sun through in-situ spacecraft measurements. While the existence of such a ring in a debris disk could not be identified in the spectral energy distribution (SED), the size of a dust-free zone shapes the SED. Since we analytically obtain the location and temperature of sublimation, these analytical formulae are useful to find such sublimation evidences.
Key words: Sublimation, dust, interplanetary medium, debris disks, celestial mechanics.

Corresponding author E-mail: hkobayas@astro.uni-jena.de

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