Date: Monday 26-Apr-2021
Time: 11:15-12:15
Location: Zoom
Speaker: Ludmilla Kolokolova (UMD)
Title: Multi-messaging in cometary science
Multi-messaging in astronomy means “the coordinated observation and interpretation of disparate "messenger" signals.” (Wikipedia). Usually this refers to the information that comes from different types of physical “messengers”, e.g., electromagnetic radiation, gravitational waves, neutrinos, etc. However, the messengers can be just different types of electromagnetic radiation or different properties of the electromagnetic radiation. For example, to receive a consistent picture of the properties of cosmic dust or planetary atmospheres and surfaces, it is good to combine information obtained in UV, visible, IR, and microwave spectral ranges. One can receive even more accurate characteristics of the objects considering different techniques, e.g., photometry, spectroscopy, polarimetry, characteristics of the returned samples, and in-situ mission data.
In this talk I consider how multi-messaging is used to study properties of cometary dust by combining information that comes from photometry, spectra, and polarization. Comets C/2014 A4 (SONEAR) and C/2011 KP36 (Spacewatch) will be considered as examples, and the obtained “multi-messaging” data will be interpreted using a computational model of the dust as an ensemble of polydisperse porous, rough spheroids. The results allow us not only to describe properties of the dust in different coma features (jets, shells, etc.), but also to explore the dust evolution with the distance from the nucleus. I will also introduce an interactive online database of the pre-calculated dust properties that can be used for other studies.
For further information contact PALS coordinator Dr. Lori Feaga at feaga@astro.umd.edu or (301)-405-1383.
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.
