Near-Infrared Polarimetry and Photometry of Recent Comets

Details Near-Infrared Polarimetry and Photometry of Recent Comets Near-Infrared Polarimetry and Photometry of Recent Comets

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....127.2398k&link_type=abstract

The Astronomical Journal, Volume 127, Issue 4, pp. 2398-2405.

Astronomy and Astrophysics

Astronomy

12

Comets: General, Comets: Individual: (10P/Tempel), Comets: Individual: (19P/Borrelly), Comets: Individual: (C/1995 O1 (Hale-Bopp)), Infrared: Solar System

Scientific paper

We present near-infrared (2.2 μm) imaging polarimetry and near-infrared photometry for recent comets. The 2.2 μm polarization as a function of phase angle is 1%-2% higher than typical comet visual narrowband red polarization. This implies a general, but weak, trend to higher polarization at wavelengths longer than 0.7 μm. As found with visual narrowband red polarimetry, comets appear to divide into a high- and a low-polarization class at 2.2 μm as well. The high-polarization class is characterized by moderate to strong mid-infrared silicate emission, while the low-polarization class is characterized by weak to absent silicate emission. In contrast to C/1995 O1 (Hale-Bopp) and some other dusty comets, no significant grain population radial gradient is seen in any of the polarization maps for the six comets in our sample with near-infrared imaging polarimetry. Our analysis of previously published Hale-Bopp data shows that the polarization at 40° phase angle varies by only about a factor of 1.6 from 0.3 to 2.2 μm and is nearly flat from 0.7 to 2.2 μm. Any model of comet dust must reproduce this weak wavelength dependence.

Affiliated with

Also associated with

No associations

Rating

Near-Infrared Polarimetry and Photometry of Recent Comets does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Near-Infrared Polarimetry and Photometry of Recent Comets, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Near-Infrared Polarimetry and Photometry of Recent Comets will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1386382