27/11/2007 (10h00 - Observatoire Meudon - Salle de réunion bât. 17)
Anand Sivaramakrishnan (American Museum of Natural History, New York)
Coronagraphic design and tolerancing for GPI

Résumé : The GPI ExAO coronagraphic instrument spurred advances on several fronts. I will present early results on our coronagraphic studies, notably chromatic properties of HEBS glass apodizers used in the apodized pupil Lyot coronagraph, an active slow speckle-reducing calibration system behind the focal plane mask occulter, multi-wavelength speckle subtraction using IFU spectrograph data cubes, and lab tests on a device to enable coronagraphic astrometry and photometry. I will also present results of a statistical analysis of our Lyot Project ExAO coronagraphic survey data from AEOS, which set limits on companions to the stars that we surveyed between 2004 and 2007.


Télécharger le résumé en PDF