Dust in Comet C/2007 N3 (Lulin)

Details Dust in Comet C/2007 N3 (Lulin) Dust in Comet C/2007 N3 (Lulin)

2011-03-03

arxiv.org/abs/1103.0593v2

Astronomy and Astrophysics

Astrophysics

Earth and Planetary Astrophysics

18 pages, 9 figures, 3 tables

Scientific paper

We report optical imaging, optical and near-infrared polarimetry, and Spitzer mid-infrared spectroscopy of comet C/2007 N3 (Lulin). Polarimetric observations were obtained in R (0.676 micron) at phase angles from 0.44 degrees to 21 degrees with simultaneous observations in H (1.65 micron) at 4.0 degrees, exploring the negative branch in polarization. Comet C/2007 N3 (Lulin) shows typical negative polarization in the optical as well as a similar negative branch near-infrared wavelengths. The 10 micron silicate feature is only weakly in emission and according to our thermal models, is consistent with emission from a mixture of silicate and carbon material. We argue that large, low-porosity (akin to Ballistic Particle Cluster Aggregates) rather absorbing aggregate dust particles best explain both the polarimetric and the mid-infrared spectral energy distribution.

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