Polarimetry of Comets in the Near-IR

Details Polarimetry of Comets in the Near-IR Polarimetry of Comets in the Near-IR

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..343..192k&link_type=abstract

Astronomical Polarimetry: Current Status and Future Directions ASP Conference Series, Vol. 343, Proceedings of the Conference he

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We present near-IR (2.2 micron) imaging polarimetry for seven recent comets. This data, and previous measurements of comets C/1995 O1 (Hale-Bopp) and 1P/Halley, yield a trend in polarization versus phase angle that is typically 1 - 2% higher in the near-IR than in the visual. We also find that comets divide into two classes at phase angles greater than 30° based on their polarization. These classes are associated with the presence or absence of mid-IR silicate emission. Using previously published comet Hale-Bopp polarization data as an example, we show the polarization at 40° phase angle varies by a factor of 1.6 from 0.3 to 2.2 micron. This weak wavelength dependence indicates that the polarization is not strongly sensitive to grain size by a wavelength of 2.2 micron suggesting the grains/aggregates must be at least 1 micron in size.

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