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Origin of the Near-Ecliptic Circumsolar Dust Band

Nesvorný, David and Bottke, William F. and Vokrouhlický, David and Sykes, Mark and Lien, David J. and Stansberry, John (2008) Origin of the Near-Ecliptic Circumsolar Dust Band. Astrophysical Journal Letters, 679 (1). L143-L146. ISSN 2041-8205.

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The zodiacal dust bands are bright infrared (IR) strips produced by thermal emission from circumsolar rings of particles. Two of the three principal dust bands, known as β and γ, were previously linked to the recent asteroid collisions that produced groups of fragments, so-called asteroid families, near the orbits of (832) Karin and (490) Veritas. The origin of the third, near-ecliptic α band has been unknown until now. Here we report the discovery of a recent breakup of a >20 km diameter asteroid near α's originally suspected source location in the Themis family. Numerical modeling and observations of the α-band thermal emission from the Spitzer Space Telescope indicate that the discovered breakup is the source of α-band particles. The recent formation of all principal dust bands implies a significant time variability of the circumstellar debris disks.

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Additional Information:© 2008. The American Astronomical Society. Received 2008 March 19; accepted 2008 April 8; published 2008 May 8. This Letter is based on work supported by the NASA's Planetary Geology and Geophysics program and Spitzer Cycle 1 grant entitled “The Production of Zodiacal Dust by Asteroids and Comets” (PID 2317, PI Sykes). The work of D. V. was supported by research grant 205/08/0064 of the Czech Grant Agency. We thank William Reach, Daniel Durda, Sumita Jayaraman, and Russell Walker for their contributions to planning and obtaining the Spitzer observations.
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Czech Grant Agency205/08/0064
Subject Keywords:interplanetary medium; minor planets; asteroids
Issue or Number:1
Record Number:CaltechAUTHORS:NESapjl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11430
Deposited By: Archive Administrator
Deposited On:14 Aug 2008 20:46
Last Modified:03 Oct 2019 00:19

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