A New Solar System Dust Band

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Title:		A New Solar System Dust Band
Authors:		Espy, Ashley J.; Dermott, S. F.; Kehoe, T. J.; Jayaraman, S.
Affiliation:		AA(Univ. of Florida), AB(Univ. of Florida), AC(Univ. of Florida), AD(Planetary Science Institute)
Publication:		American Astronomical Society, DPS meeting #39, #59.09; Bulletin of the American Astronomical Society, Vol. 39, p.536
Publication Date:		10/2007
Origin:		AAS
Abstract Copyright:		(c) 2007: American Astronomical Society
Bibliographic Code:		2007DPS....39.5909E

Abstract

The relative proportions of asteroidal and cometary material in the zodiacal cloud is an evolving debate. The determination of the asteroidal component is constrained through the study of the dust bands (the fine-structure component superimposed on the broad background cloud), since they have been confidently linked to specific, young, asteroid family disruptions in the main belt. These disruptions represent recent injections of dust into the cloud and thus hold the key to determining at least a minimum value of the asteroidal contribution. There are currently known to be three dust band pairs, one at approximately 10 degrees corresponding to the Veritas family and two central band pairs near the ecliptic, one of which corresponds to the Karin cluster of the Koronis family. However, through careful co-adding of almost all the pole-to-pole intensity scans in the mid infrared wavebands of the IRAS data set, a new solar system dust band has been found at approximately 17 degrees inclination. We think this is a confirmation of the M/N partial band pair suggested by Sykes (1988). The new dust band appears to be mostly, yet not completely formed, which we attribute to the young age of the likely sources. We will present dynamical modeling of the new band which allows us to determine the most likely source and amount of cross-sectional area of dust in the band. This is turn allows us to put constraints on the size of the precursor and amount of dust contributed by this source to the background cloud. Since the band is incomplete, the dynamics of the distribution of the node will allow us to put loose constraints on the time of formation of this band and compare with the ages of the potential sources. This work is funded by NASA GSRP.

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