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Jeremy Bailey (UNSW Sydney)


Jeremy Bailey (UNSW Sydney)

October 17, 2017 @ 12:00 PM - 1:00 PM

At UNSW we have built the world’s most sensitive astronomical polarimeter, capable of measuring stellar polarisation down to levels of a few parts per million. I will describe the instrument and the research we have done with it since its commissioning in 2014. One of the main goals of such instruments has been to contribute to the characterisation of exoplanet atmospheres by detecting polarised light reflected from hot-Jupiter type planets. However, we can also learn much about stars using these techniques. We have made some of the first polarimetric observations that directly probe stellar atmospheres and allow us to constrain stellar properties. In order to interpret these observations we have developed methods for modelling the atmospheres of both planets and stars including full polarisation in the radiative transfer. I will also describe future plans including a version of the instrument we are developing for Gemini North.