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

We present the monochromatic lab verification of the newly developed SCARcoronagraph that combines a phase plate (PP) in the pupil with a microlens-fedsingle-mode fiber array in the focal plane. The two SCAR designs that have beenmeasured, create respectively a 360 degree and 180 degree dark region from0.8-2.4 \lambda/D around the star. The 360 SCAR has been designed for a clearaperture and the 180 SCAR has been designed for a realistic aperture withcentral obscuration and spiders. The 360 SCAR creates a measured stellar nullof $2-3 \times 10^{-4}$ , and the 180 SCAR reaches a null of $1 \times 10^{-4}$. Their monochromatic contrast is maintained within a range of $\pm$ 0.16\lambda/D peak-to-valley tip-tilt, which shows the robustness against tip-tilterrors. The small inner working angle and tip-tilt stability makes the SCARcoronagraph a very promising technique for an upgrade of current high-contrastinstruments to characterize and detect exoplanets in the solar neighborhood.

The Single-mode Complex Amplitude Refinement (SCAR) coronagraph: II. Lab verification, and toward the characterization of Proxima b