Physics – Optics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..28j&link_type=abstract
Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s
Physics
Optics
Scientific paper
We are currently working out a phase-B study for building a second generation VLT-instrument, named SPHERE, which aims to directly detect extra-solar planets. SPHERE (Spectro-Polarimetric High-contrast Exo-planet REsearch) is a multi-mode instrument for direct detecting and analyzing young (IR) and old (vis) extra-solar planets. The institute of Astronomy at ETH Zurich is responsible for the visual instrument of SPHERE, the high-accuracy imaging polarimeter ZIMPOL (Zurich IMaging POLarimeter). ZIMPOL reaches a polarimetric accuracy of 10^-5. ZIMPOL uses fast (kHz) modulation/demodulation of the incoming polarized signal and is therefore faster than seeing variations. Light reflected by planetary atmospheres can highly be polarized whereas the central star can be assumed as unpolarized. With diffraction limited resolution at the VLT and an extreme adaptive optics combined with coronagraphy direct detection of extra-solar planets will be possible with SPHERE/ZIMPOL.
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