The vector vortex coronagraph: Laboratory results and first light at palomar observatory

Abstract

High-contrast coronagraphy will be needed to image and characterize faint extrasolar planetary systems. Coronagraphy is a rapidly evolving field, and many enhanced alternatives to the classical Lyot coronagraph have been proposed in the past 10 years. Here, we discuss the operation of the vector vortex coronagraph, which is one of the most efficient possible coronagraphs. We first present recent laboratory results and then first light observations at the Palomar observatory. Our near-infrared H-band (centered at ∼1.65 μm) and K-band (centered at ∼2.2 μm) vector vortex devices demonstrated excellent contrast results in the lab, down to ∼10-6 at an angular separation of ∼3λ/d. On sky, we detected a brown dwarf companion 3000 times fainter than its host star (HR 7672) in the Ks band (centered at ∼2.15 μm), at an angular separation of 2.5λ/d. Current and next-generation high-contrast instruments can directly benefit from the demonstrated capabilities of such a vector vortex: simplicity, small inner working angle, high optical throughput (>90%), and maximal off-axis discovery space. © 2010. The American Astronomical Society. All rights reserved.