Extreme coronagraphy with an adaptive hologram Simulations of exo-planet imaging - Astrophysics > Instrumentation and Methods for AstrophysicsReport as inadecuate




Extreme coronagraphy with an adaptive hologram Simulations of exo-planet imaging - Astrophysics > Instrumentation and Methods for Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Aims. We present a solution to improve the performance of coronagraphs forthe detection of exo-planets. Methods. We simulate numerically several kinds ofcoronagraphic systems, with the aim of evaluating the gain obtained with anadaptive hologram. Results. The detection limit in flux ratio between a starand a planet Fs-Fp observed with an apodized Lyot coronagraph characterizedby wavefront bumpiness imperfections of lambda-20 resp. lambda-100 turns outto be increased by a factor of 10^3.4 resp. 10^5.1 when equipped with ahologram. Conclusions. This technique could provide direct imaging of anexo-Earth at a distance of 11 parsec with a 6.5m space telescope such as theJWST with the optical quality of the HST.



Author: D. Ricci, H. Le Coroller, A. Labeyrie

Source: https://arxiv.org/







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