Comparing Numerical Simulations Of Wakes With CIRS Data : New Constrains On The A Ring's Microphysics

Details Comparing Numerical Simulations Of Wakes With CIRS Data : New Constrains On The A Ring's Microphysics Comparing Numerical Simulations Of Wakes With CIRS Data : New Constrains On The A Ring's Microphysics

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.3803l&link_type=abstract

American Astronomical Society, DPS meeting #38, #38.03; Bulletin of the American Astronomical Society, Vol. 38, p.552

Astronomy and Astrophysics

Astronomy

Scientific paper

Some recent CIRS observations of the A ring (Ferrari et al. 2005) have shown a modulation of the filling factor β, with the ring longitude, in the infrared wavelengths. The minimum of the emissivity is always seen at longitude of about 249° and 69°, with respect to the sub-observer point in the direction of the orbital motion. Julian-Toomre gravity wakes, having a pitch angle of about 20-25° with respect to the local tangential direction, seem to provide a plausible explanation for the observed quadrupole asymmetry.
We present new dynamical simulations of A ring wakes (Charnoz et al. 2003), coupled with a photometric model : a Monte Carlo ray-casting code. We show that such modelling is able to explain the apparent variation of the photometric optical depth with the longitude within an agreement better than 20%. It is also shown that the general shape of the asymmetry depends on the spatial distribution of ring particles, which also depends mainly on the surface density and the optical depth. These results provide then new constrains on the surface density, optical depth, as well as on the Toomre Parameter Q at 100m scale in the rings.

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