Wavefront error correction and Earth-like planet detection by a self-coherent camera in space

Context. In the context of exoplanet detection, the performance of coronagraphs is limited by wavefront errors. Aims. To remove efficiently the effects of these aberrations using a deformable mirror, the aberrations themselves must be measured in the science image to extremely high accuracy. Methods...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2008-09, Vol.488 (1), p.L9-L12
Main Authors: Galicher, R., Baudoz, P., Rousset, G.
Format: Article
Language:English
Subjects:
Astronomy
Astrophysics
Earth, ocean, space
Exact sciences and technology
instrumentation: adaptive optics
instrumentation: high angular resolution
instrumentation: interferometers
Physics
techniques: high angular resolution
techniques: image processing
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Summary:Context. In the context of exoplanet detection, the performance of coronagraphs is limited by wavefront errors. Aims. To remove efficiently the effects of these aberrations using a deformable mirror, the aberrations themselves must be measured in the science image to extremely high accuracy. Methods. The self-coherent camera which is based on the principle of light incoherence between star and its environment can estimate these wavefront errors. This estimation is derived directly from the encoded speckles in the science image, avoiding differential errors due to beam separation and non common optics. Results. Earth-like planet detection is modeled by numerical simulations with realistic assumptions for a space telescope. Conclusions. The self-coherent camera is an attractive technique for future space telescopes. It is also one of the techniques under investigation for the E-ELT planet finder the so-called EPICS.
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361:200810356