Reference : Extreme coronagraphy with an adaptive hologram: Simulations of exo-planet imaging
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
Extreme coronagraphy with an adaptive hologram: Simulations of exo-planet imaging
Ricci, Davide mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Le Coroller, Hervé [ > > ]
Labeyrie, Antoine [ > > ]
Astronomy and Astrophysics
EDP Sciences
Yes (verified by ORBi)
Les Ulis
[en] instrumentation: detectors ; stars: planetary systems ; instrumentation: interferometers
[en] 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 (Fs /Fp ) 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 10^3.4 (resp. 10^5.1 ) 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.

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