| Issue |
A&A
Volume 503, Number 1, August III 2009
|
|
|---|---|---|
| Page(s) | 301 - 308 | |
| Section | Astronomical instrumentation | |
| DOI | https://doi.org/10.1051/0004-6361/200811529 | |
| Published online | 22 June 2009 | |
Extreme coronagraphy with an adaptive hologram
Simulations of exo-planet imaging
1
Département d'Astrophysique, Géophysique et Océanographie, Bât. B5C, Sart Tilman, Université de Liège, 4000 Liege 1, Belgium e-mail: ricci@astro.ulg.ac.be
2
Observatoire de Haute Provence, 04870 Saint Michel l'Observatoire, France e-mail: herve.lecoroller@oamp.fr
3
Collège de France, 11, place Marcelin Berthelot, 75231 Paris Cedex 05, France e-mail: antoine.labeyrie@obs-azur.fr
Received:
16
December
2008
Accepted:
15
May
2009
Aims. We present a solution to improve the performance of coronagraphs for the detection of exo-planets.
Methods. We simulate numerically several kinds of coronagraphic systems, with the aim of evaluating the gain obtained with an adaptive hologram.
Results. The detection limit in flux ratio between a star and a planet 
observed with an apodized Lyot coronagraph characterized by wavefront bumpiness imperfections of λ/20 (resp. λ/100) turns out to be increased by a factor of 103.4 (resp. 105.1) when equipped with a hologram.
Conclusions. This technique could provide direct imaging of an exo-Earth at a distance of 11 parsec with a 6.5 m space telescope such as the JWST with the optical quality of the HST.
Key words: instrumentation: detectors / instrumentation: miscellaneous / stars: planetary systems / instrumentation: interferometers
© ESO, 2009
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