Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confr..47m&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
Scientific paper
I describe a laboratory simulator to test and calibrate the Extreme Polarimeter, ExPo, which will observe circumstellar disks and exoplanets. The set-up is meant to be as close to the actual situation as possible. The star and planet are simulated with an arc lamp that illuminates two fibers. The star has a flux of ~1011 photons per second, and the exoplanet is partially linearly polarized with a flux of ~102 photons per second to simulate the reflected light. The separation on the sky is 1' corresponding to 53' in the lab (~ 250 microns) for the fiber separation. Two lenses of 83 mm simulate the 4.2-m William Herschel Telescope , the scale being determined by the diffraction lambda/D. Between these two lenses, the seeing and the atmospheric dispersion are simulated with a rotating glass plate covered with hairspray (seeing) and a wedge prism (atmospheric dispersion).
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