English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The imaging and characterization of a larger range of exoplanets, down toyoung Jupiters and exo-Earths will require accessing very high contrasts atsmall angular separations with an increased robustness to aberrations, threeconstraints that drive current instrumentation development. This goal relies onefficient coronagraphs set up on extremely large diameter telescopes such asthe Thirty Meter Telescope (TMT), the Giant Magellan Telescope (GMT), or theExtremely Large Telescope (ELT). However, they tend to be subject to specificaberrations that drastically deteriorate the coronagraph performance: theirprimary mirror segmentation implies phasing errors or even missing segments,and the size of the telescope imposes large spiders, generating low-wind effectas already observed on the Very Large Telescope (VLT)/SPHERE instrument or atthe Subaru telescope, or adaptive-optics-due petaling, studied in simulationsin the ELT case. The ongoing development of coronagraphs has then to take intoaccount their sensitivity to such errors. We propose an innovative method togenerate coronagraphs robust to primary mirror phasing errors and low-wind andadaptive-optics-due petaling effect. This method is based on the apodization ofthe segment or petal instead of the entire pupil, this apodization being thenrepeated to mimic the pupil redundancy. We validate this so-called RedundantApodized Pupil (RAP) method on a James Webb Space Telescope-like pupil composedof 18 hexagonal segments segments to align, and on the VLT architecture in thecase of residual low-wind effect.

Redundant Apodized Pupils (RAP) for high-contrast imagers robust to segmentation-due aberrations and island effects