A search for interstellar meteoroids using the Canadian Meteor Orbit Radar (CMOR) |
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Authors: | R J Weryk P Brown |
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Institution: | (1) Department of Physics and Astronomy, University of Western Ontario, London, ON, Canada |
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Abstract: | Using the CMOR system, a search was conducted through 2.5 years (more than 1.5 million orbits) of archived data for meteoroids
having unbound hyperbolic orbits around the Sun. Making use of the fact that each echo has an individually measured error,
we were able to apply a cut-off for heliocentric speeds both more than two, and three standard deviations above the parabolic
limit as our main selection criterion. CMOR has a minimum detectable particle radius near 100 μm for interstellar meteoroids.
While these sizes are much larger than reported by the radar detections of extrasolar meteoroids by AMOR or Arecibo, the interstellar
meteoroid population at these sizes would be of great astrophysical interest as such particles are more likely to remain unperturbed
by external forces found in the interstellar medium, and thus, more likely to be traceable to their original source regions.
It was found that a lower limit of approximately 0.0008% of the echoes (for the 3σ case) were of possible interstellar origin.
For our effective limiting mass of 1×10−8 kg, this represents a flux of meteoroids arriving at the Earth of 6×10−6 meteoroids/km2/h. For our 2σ results, the lower limit was 0.003%, with a flux of 2×10−5 meteoroids/km2/h. The total number of events was too low to be statistically meaningful in determining any temporal or directional variations. |
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Keywords: | Interstellar meteoroids meteors radar |
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