Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling

Details Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009m%26ps...44.1937m&link_type=abstract

Meteoritics & Planetary Science, vol. 44, Issue 12, p.1937-1946

Physics

3

Asteroid Surface, Cometary Nucleus, Cosmic Dust, Remote Sensing

Scientific paper

We present Markov-Chain Monte-Carlo methods (MCMC) for the derivation of empirical model parameters for photometric and polarimetric phase curves of asteroids. Here we model the two phase curves jointly at phase angles ˜25° using a linear-exponential model, accounting for the opposition effect in disk-integrated brightness and the negative branch in the degree of linear polarization. We apply the MCMC methods to V-band phase curves of asteroids 419 Aurelia (taxonomic class F), 24 Themis (C), 1 Ceres (G), 20 Massalia (S), 55 Pandora (M), and 64 Angelina (E). We show that the photometric and polarimetric phase curves can be described using a common nonlinear parameter for the angular widths of the opposition effect and negative-polarization branch, thus supporting the hypothesis of common physical mechanisms being responsible for the phenomena. Furthermore, incorporating polarimetric observations removes the indeterminacy of the opposition effect for 1 Ceres. We unveil a trend in the interrelation between the enhancement factor of the opposition effect and the angular width: the enhancement factor decreases with decreasing angular width. The minimum polarization and the polarimetric slope at the inversion angle show systematic trends when plotted against the angular width and the normalized photometric slope parameter. Our new approach allows improved analyses of possible similarities and differences among asteroidal surfaces.

Affiliated with

Also associated with

No associations

Rating

Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling 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 Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Asteroid photometric and polarimetric phase curves: Joint linear-exponential modeling will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1139144