Astron. Astrophys. Suppl. Ser.
Volume 145, Number 3, September 2000
|Page(s)||445 - 449|
|Published online||15 September 2000|
Gain estimate for exoplanet detection with adaptive optics
Dpto. de Fisica Aplicada, Universidad de Cantabria, Avda. Castros S/N, 39005 Santander, Spain
Send offprint request to: V.F. Canales, e-mail: firstname.lastname@example.org
Accepted: 9 June 2000
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 conditions.
Key words: atmospheric effects / techniques: image processing / telescopes
© European Southern Observatory (ESO), 2000