Extreme coronagraphy with an adaptive hologram: Simulations of exo-planet imaging

Ricci, Davide; Le Coroller, Hervé; Labeyrie, Antoine

doi:10.1051/0004-6361/200811529

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Extreme coronagraphy with an adaptive hologram: Simulations of exo-planet imaging

Ricci, Davide; Le Coroller, Hervé; Labeyrie, Antoine

2009 • In Astronomy and Astrophysics, 503, p. 301-308

Peer Reviewed verified by ORBi

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https://hdl.handle.net/2268/32890

DOI
10.1051/0004-6361/200811529

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Keywords :

instrumentation: detectors; stars: planetary systems; instrumentation: interferometers

Abstract :

[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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Ricci, Davide ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Le Coroller, Hervé

Labeyrie, Antoine

Language :

English

Title :

Extreme coronagraphy with an adaptive hologram: Simulations of exo-planet imaging

Publication date :

August 2009

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, France

Volume :

503

Pages :

301-308

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2009A%26A...503..301R

Available on ORBi :

since 16 December 2009

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