Proposed Observations of Earth's Resonant Ring and Zodiacal Cloud with SIRTF

Details Proposed Observations of Earth's Resonant Ring and Zodiacal Cloud with SIRTF Proposed Observations of Earth's Resonant Ring and Zodiacal Cloud with SIRTF

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.3832j&link_type=abstract

American Astronomical Society, DPS meeting #35, #38.32; Bulletin of the American Astronomical Society, Vol. 35, p.1488

Astronomy and Astrophysics

Astronomy

Scientific paper

The orbit of SIRTF presents a unique opportunity to study the Earth's resonant ring - a heliocentric ring of dust particles at 1 AU. The ring particles, mostly produced from the grinding down of asteroids in the main belt, spiral into the inner Solar System by drag forces and are trapped into resonant orbits in the vicinity of the Earth. Azimuthal asymmetries in the dust ring due to the effects of drag forces and resonant perturbations, result in a dust cloud that follows the Earth in its wake. This cloud produces a flux asymmetry in the zodiacal Cloud observations, the radiation in the direction trailing The Earth's orbital motion is higher than the flux in the Leading direction by approximately 1.7 MJy/Sr (2-3% increase). As SIRTF drifts away from the Earth during its mission, it will traverse directly through the trailing dust cloud and probe it in detail.
We propose systematic monitoring of the leading and trailing zodiacal flux asymmetry that is estimated to increase to >7 MJy/Sr, a five fold increase from the current level. We plan to observe 12 points in the sky (including the ecliptic poles) at regular time intervals throughout the mission using the MIPS instrument in Total Power Mode, which will yield absolutely calibrated data. Additionally, scans perpendicular to the Ecliptic in MIPS scan-map mode will extract the underlying zodiacal dust band structure.
SIRTF observations of Earth's resonant ring will (1) monitor variations of the local zodiacal foreground over the lifetime of SIRTF; (2) shed light on the size-frequency distribution dust in the near-Earth interplanetary environment; (3) act as a case study for the formation and structure of resonant rings in debris disks, associated with the existence of planets embedded in nearby stars.

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