use in up to 20% wide spectral bands for ground-based telescopes.'
author:
- Olivier Guyon
- 'Philip M. Hinz'
- Eric Cady
- Ruslan Belikov
- Frantz Martinache
bibliography:
- 'ms.bib'
title: High Performance Lyot and PIAA Coronagraphy for Arbitrarily shaped Telescope Apertures
---

Introduction {#sec:intro}
============

Direct imaging of exoplanets with ground-based telescopes is becoming possible thanks to advances in adaptive optics, as demonstrated by several recent direct imaging exoplanet discoveries [@2010Sci...329...57L; @2008Sci...322.1348M; @2013ApJ...763L..32C]. While current ground-based instruments are most sensitive to relatively massive and young planets at large angular separation (typically beyond a few tenths of an arcsecond), recent developments in coronagraphic techniques, “extreme” Adaptive Optics and calibration techniques are pushing detection limits deeper in contrast and closer in angular separation, soon providing access to the planet-rich inner parts of planetary systems [@2008SPIE.7015E..31M; @2008SPIE.7014E..41B; @2009SPIE.7440E..20M; @2011ApJ...729..132C]. Direct imaging of the inner part (1 to 5 AU) of young planetary systems is of especially high scientific value to constrain and understand planetary systems formation and evolution near the habitable zone, and requires the combination of an efficient coronagraph offering small inner working angle and a high level of wavefront correction and calibration.

High contrast imaging from space allows access 