Origin of the Near-Ecliptic Circumsolar Dust Band

Details Origin of the Near-Ecliptic Circumsolar Dust Band Origin of the Near-Ecliptic Circumsolar Dust Band

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...679l.143n&link_type=abstract

The Astrophysical Journal, Volume 679, Issue 2, pp. L143-L146.

Astronomy and Astrophysics

Astronomy

21

Interplanetary Medium, Minor Planets, Asteroids

Scientific paper

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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