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		| Paper: | 
		Data Reduction Approach for the Extreme Polarimeter | 
	 
	
		| Volume: | 
		449, Astronomical  Polarimetry 2008: Science from Small to Large Telescopes | 
	 
	
		| Page: | 
		79 | 
	 
	
		| Authors: | 
		Canovas, H.; Rodenhuis, M.; Jeffers, S. V.; Keller, C. U. | 
	 
	
	
		| Abstract: | 
		ExPo (Extreme Polarimeter) is an imaging polarimeter that we are building
 at Utrecht University, The Netherlands. It will detect polarized light from
 circumstellar disks and extrasolar planets, initially at the 4.2 m
 WHT and later at other telescopes. We have developed a data reduction
 approach that minimizes the influence of instrumental and atmospherical
 effects by using a partially transmitting coronagraph focal-plane mask. The
 approach has been tested with a laboratory simulator and an ExPo
 prototype. | 
	 
	
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