eXtreme Adaptive Optics Planet Imager
Direct detection of extrasolar planets
Current radial-velocity searches for extrasolar planets, though powerful, are fundamentally constrained in the range of orbits they can access by the need for a near-complete orbital period: the largest detectable semi-major axis only grows with time to the 2/3 power. In our professional lifetimes, radial velocity detection will barely reach planets with orbits comparable to Saturn. To probe the 5-100 AU range different techniques are needed. Direct detection of photons emitted by extrasolar planets is one such technique, but requires contrast levels of 107-109 at near-infrared wavelengths. We have designed an adaptive optics (AO) system capable of reaching these contrasts.
XAOPI, the eXtreme Adaptive Optics Planet Imager, is a 4096-actuator AO system. It will achieve Strehl ratios >0.9, and is optimized to remove scattered light from 0.2-1 arcseconds. Simulations predict that it will achieve contrast levels of 107-108 around for target stars with R<7. This allows detection of near-IR emission from warm extrasolar planets younger and/or more massive than Jupiter around a significant sample of target stars.
|Last Modified: Jul 16, 2003|
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