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Tytuł pozycji:

Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light.

Tytuł :
Laboratory Demonstration of Spatial Linear Dark Field Control For Imaging Extrasolar Planets in Reflected Light.
Autorzy :
Currie, Thayne
Pluzhnik, Eugene
Guyon, Olivier
Belikov, Ruslan
Miller, Kelsey
Bos, Steven
Males, Jared
Sirbu, Dan
Bond, Charlotte
Frazin, Richard
Groff, Tyler
Kern, Brian
Lozi, Julien
Mazin, Benjamin A.
Nemati, Bijan
Norris, Barnaby
Subedi, Hari
Will, Scott
Pokaż więcej
Temat :
EXTRASOLAR planets
SPECKLE
GAS giants
SOLAR system
CORONAGRAPHS
MAGNITUDE (Mathematics)
Źródło :
Publications of the Astronomical Society of the Pacific; Oct2020, Vol. 132 Issue 1016, p1-11, 11p
Przedsiębiorstwo/ jednostka :
UNITED States. National Aeronautics & Space Administration
Czasopismo naukowe
Imaging planets in reflected light, a key focus of future NASA missions and extremely large telescopes, requires advanced wavefront control to maintain a deep, temporally correlated null of stellar halo—i.e., a dark hole (DH)—at just several diffraction beam widths. Using the Ames Coronagraph Experiment testbed, we present the first laboratory tests of Spatial Linear Dark Field Control (LDFC) approaching raw contrasts (∼5 × 10−7) and separations (1.5–5.2λ/D) needed to image Jovian planets around Sun-like stars with space-borne coronagraphs like WFIRST-CGI and image exo-Earths around low-mass stars with future ground-based 30 m class telescopes. In four separate experiments and for a range of different perturbations, LDFC largely restores (to within a factor of 1.2–1.7) and maintains a DH whose contrast is degraded by phase errors by an order of magnitude. Our implementation of classical speckle nulling requires a factor of 2–5 more iterations and 20–50 deformable mirror (DM) commands to reach contrasts obtained by spatial LDFC. Our results provide a promising path forward to maintaining DHs without relying on DM probing and in the low-flux regime, which may improve the duty cycle of high-contrast imaging instruments, increase the temporal correlation of speckles, and thus enhance our ability to image true solar system analogues in the next two decades. [ABSTRACT FROM AUTHOR]
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