Date: Monday 23-Oct-2023
Time: 11:15 am-12:15 pm
Location: ATL 1250 and Zoom (contact host for link)
Speaker: Ludmilla Kolokolova (UMD)
Title: Large dust particles in the Solar system and beyond
Abstract: Recent observations of different dusty objects (debris disks, comets, active asteroids) show an abundance of dust particles in the size range of hundreds of microns, millimeters, and even centimeters.
Evidence of this is not only in situ data for comets and asteroids but also unusual photometric and polarimetric properties of some objects, including debris disks. Specifically, their phase curves are very different from those considered typical for cosmic dust. I consider laboratory measurements and computer modeling, which not only proved that unusual phase curves indicate the large size of the observed dust particles but also allow estimation of their composition and structure.
I present photopolarimetric observations of comet C/2014 B1 (Schwartz) at 9.6 au, active asteroid (248370) QN173, and DART ejecta, and show how computer modeling allows us to characterize large dust particles in these objects and variations of their properties with time and within the objects.
If you have any questions, contact the PALS hosts: Jacob Kloos (small bodies) and Matt Nixon (exoplanets).
SPECIAL ACCOMMODATIONS:Special accommodations for individuals with disabilities can be made by calling (301) 405-3001. It would be appreciated if we are notified at least one week in advance.
