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The Single-mode Complex Amplitude Refinement (SCAR) coronagraph: II. Lab verification, and toward the characterization of Proxima b.
- Source :
- Astronomy & Astrophysics / Astronomie et Astrophysique; Mar2020, Vol. 635, p1-9, 9p
- Publication Year :
- 2020
-
Abstract
- We present the monochromatic lab verification of the newly developed SCAR coronagraph that combines a phase plate (PP) in the pupil with a microlens-fed single-mode fiber array in the focal plane. The two SCAR designs that have been measured, create respectively a 360 degree and 180 degree dark region from 0:8-2:4&#955/D around the star. The 360 SCAR has been designed for a clear aperture and the 180 SCAR has been designed for a realistic aperture with central obscuration and spiders. The 360 SCAR creates a measured stellar null of 2-3 × 10<superscript>-4</superscript>, and the 180 SCAR reaches a null of 1 × 10<superscript>-4</superscript>. Their monochromatic contrast is maintained within a range of 0:16&#955/D peak-to-valley tip-tilt, which shows the robustness against tip-tilt errors. The small inner working angle and tip-tilt stability makes the SCAR coronagraph a very promising technique for an upgrade of current high-contrast instruments to characterize and detect exoplanets in the solar neighborhood. [ABSTRACT FROM AUTHOR]
- Subjects :
- FOCAL plane arrays sensors
SCARS
SINGLE-mode optical fibers
CORONAL mass ejections
Subjects
Details
- Language :
- English
- ISSN :
- 00046361
- Volume :
- 635
- Database :
- Complementary Index
- Journal :
- Astronomy & Astrophysics / Astronomie et Astrophysique
- Publication Type :
- Academic Journal
- Accession number :
- 142723462
- Full Text :
- https://doi.org/10.1051/0004-6361/201731615