Pardon our Dust: Infrared Spectroscopy and Interstellar Dust

  • March 11, 2014 · 3:00 PM

Available online...

Tuesday, March[masked] - 12:00 pm, PDT
Jean Chiar
SETI Institute


Interstellar dust grains - small sub-micron-sized particles that pollute the space between the stars - play an important role in the chemistry of the galaxy as well as the star and planet formation process. We glean most information about dust composition in the interstellar medium from infrared spectroscopy. The vibration of molecules making up the dust cause light from a background star to be absorbed at very specific frequencies in the infrared portion of the spectrum. Dust originates in the outflows of old stars and is composed mainly of silicate minerals and carbon particles. In star formation regions, the silicate grains are covered with icy mantles. I will give an overview of the nature of these dust and ice components, with emphasis on our current understanding of the cosmic life cycle of these materials.


The live video should be available there at the time of the lecture though the last one started much later than advertised. If you are having trouble getting it to work, refresh the page to see if that helps.

I scheduled this for the correct time locally.

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  • pam
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