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/ Department of Physics

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Experts in: Young Stellar objects

Bastien, Pierre


Professeur associé

My research deals mostly with star and planetary system formation. This is one of the priority research areas identified by the Canadian astronomical community. For this research, I mainly use light polarization as a means of gathering data.

Here are two examples of my ongoing research projects:

  1. Natural light vibrates in a plane that varies continuously and at random. When it vibrates in a preferential plane, we say that it is polarized. For measuring polarization from celestial objects, I am supervising a new polarimeter being built for the Mont Mégantic Observatory, POMM, that will be 100 times more precise than the one currently in use. Light from a young star is scattered and polarized by microscopic dust grains. By measuring this polarization, we can learn more about the properties of the grains and the distribution of matter around young stars or with disks of debris. Combining these data with other observations and with modelling, we learn about conditions in protoplanetary disks where planets are formed. I will also be observing stars with exoplanets to learn about the properties of the atmospheres of these planets and determine the inclination of their orbits.
  2. I also built a polarimeter, POL-2, for the James-Clerk-Maxwell radiotelescope on Mauna Kea in Hawaii. It will soon give us information about magnetic fields in dense molecular clouds and star formation processes. We want to find out if magnetic fields are more important than turbulence (or vice versa) in slowing star formation processes, because observations show us that they are slower than what our models predict.

Areas of expertise

  • Star formation
  • Polarimetry
  • Young stars

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