Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...677.1425m&link_type=abstract
The Astrophysical Journal, Volume 677, Issue 2, pp. 1425-1432.
Astronomy and Astrophysics
Astronomy
3
Instrumentation: Miscellaneous, Instrumentation: Polarimeters, Techniques: Miscellaneous, Techniques: Polarimetric
Scientific paper
We report numerical simulations and laboratory demonstrations of a four-quadrant phase mask (FQPM) coronagraph equipped with a Jacquinot pupil as a Lyot stop. We demonstrate that the Jacquinot-Lyot stop can effectively suppress the residual stellar intensity due to tip-tilt errors for unresolved stars. We also show that the achievable contrast with the Jacquinot-Lyot stop depends on the direction of the tip-tilt errors, which suggests that the contrast can be improved if the direction of these errors is monitored simultaneously with the data acquisition. Furthermore, we conduct laboratory experiments with a polarization differential imager in which the Jacquinot-Lyot stop is introduced into a four-quadrant polarization mask (FQPoM) coronagraph. In these experiments we also demonstrate two image processing techniques, a cross-correlation technique and a polarization-degree analysis, to extract planetary signal from residual stellar speckle noise.
Baba Naoshi
Murakami Noriko
Nishikawa Jared
Sato Yuzuru
Tamura Masafumi
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