Modelling of Polarization Properties of Cometary Dust Grains

نویسندگان

  • D. A. Semenov
  • N. V. Voshchinnikov
چکیده

Observational data for dusty comets are summarized and systemized. The dependence of the linear polarization on various parameters (the phase angle, wavelength, etc.) is analyzed. An ensemble of aligned spheroidal particles having various sizes and chemical compositions is used to fit the linear and circular polarization observed for the comet Halley.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Scattering Properties and Composition of Cometary Dust

Composition of the Comet dust obtained by the dust impact analyzer on the Halley probes indicated that the comet dust is a mixture of silicate and carbonaceous material. The collected interplanetary dust particles (IDP’s) are fluffy and composite, having grains of several different types stuck together. Using Discrete Dipole Approximation (DDA) we study the scattering properties of composite gr...

متن کامل

Computational Model of Light Scattering by Irregular Particles: Approximation to Polarization Measurements of Cometary Dust

We present a computational model to obtain the scattering properties of a distribution of non-spherical particles at visible wavelengths and its application to cometary dust and to laboratory scattering measurements of cometary dust analogue. We have calculated the size-shape-averaged scattering matrix elements for both regular and irregular compact shapes and the size-averaged scattering matri...

متن کامل

Light scattering by aggregate particles

We have investigated scattering properties of aggregates, emphasizing the size of constituent monomers comparable with the wavelength of visible light, in order to model the scattering properties of cometary dust. This has differentiated our study from previous investigations of aggregates in which the size of the monomers was much smaller than the wavelength. For aggregates, the absorption cro...

متن کامل

The Signature of Primordial Grain Growth in the Polarized Light of the Au Mic Debris Disk

We have used the coronagraphic mode of the Advanced Camera for Surveys aboard the Hubble Space Telescope to make the first polarization maps of the debris disk surrounding the nearby M star AU Microscopii (GJ 803). The linear polarization of the scattered light from the disk is unambiguously detected. We find that the degree of polarization for the disk rises monotonically from about 0.05 to 0....

متن کامل

The Signature of Primordial Grain Growth in the Polarized Light of the Au Microscopii Debris Disk

We have used the Hubble Space Telescope Advanced Camera for Surveys coronagraph to make the first polarization maps of the AU Microscopii debris disk. The polarization rises from 5% at 20 AU to 40% at 80 AU. The polarization is perpendicular to the disk, indicating that the scattered light originates from micron-sized grains in an optically thin disk. Disk models show that interior to the ‘‘bir...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2000