Astron. Astrophys. Suppl. Ser. 145, 445-449
Gain estimate for exoplanet detection with adaptive optics
V.F. Canales -
Send offprint request: V.F. Canales,
Dpto. de Fisica Aplicada, Universidad de Cantabria, Avda. Castros S/N, 39005 Santander, Spain
Received June 9; accepted June 9, 2000
Copyright The European Southern Observatory (ESO)
Atmospheric turbulence imposes the resolution limit attainable by
large ground-based telescopes. Adaptive optics systems can compensate
turbulence-induced distortions. One of the most difficult task for
telescopes assisted by adaptive optics systems is the detection of
extrasolar planets since a compensation level higher than in other
applications is needed. In this context, the gain of the system
(ratio between the peak and the halo intensity) gives a good
description of the system performance. A way to theoretically
estimate the system gain and a technique to estimate it from the
measurement of the experimental Strehl ratio are developed
using a single model of the PSF of compensated wavefronts. From it,
the integration time required to detect a Jupiter-like planet is
derived from the number of system actuators and the atmospheric
Key words: atmospheric effects -- techniques: imageprocessing -- telescopes
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