scholarly journals High-contrast imager for complex aperture telescopes (HiCAT): 5. first results with segmented-aperture coronagraph and wavefront control

2018 ◽  
Author(s):  
Elodie Choquet ◽  
A.J. Eldorado Riggs ◽  
Rémi Soummer ◽  
Gregory R. Brady ◽  
Keira Brooks ◽  
...  
Keyword(s):  
High Contrast ◽  
Wavefront Control ◽  
First Results

scholarly journals The high-contrast spectroscopy testbed for segmented telescopes (HCST): new wavefront control demonstrations

2019 ◽  
Author(s):  
Jorge Llop Sayson ◽  
Garreth Ruane ◽  
Nemanja Jovanovic ◽  
Dimitri Mawet ◽  
Daniel Echeverri ◽  
...  
Keyword(s):  
High Contrast ◽  
Wavefront Control

scholarly journals Techniques for High-contrast Imaging in Multi-star Systems. II. Multi-star Wavefront Control

2017 ◽  
Vol 849 (2) ◽  
pp. 142 ◽  
Author(s):  
D. Sirbu ◽  
S. Thomas ◽  
R. Belikov ◽  
E. Bendek
Keyword(s):  
High Contrast ◽  
Contrast Imaging ◽  
Wavefront Control ◽  
High Contrast Imaging

How many suns are in the sky? Multiplicity surveys of exoplanet host stars

2018 ◽  
Vol 14 (S345) ◽  
pp. 316-317 ◽  
Author(s):  
M. Mugrauer ◽  
C. Ginski ◽  
N. Vogt ◽  
R. Neuhäuser ◽  
C. Adam
Keyword(s):  
Milky Way ◽  
Planet Formation ◽  
High Contrast ◽  
Contrast Imaging ◽  
Direct Imaging ◽  
High Contrast Imaging ◽  
Multiple Stars ◽  
First Results ◽  
Formation And Evolution ◽  
Host Stars

AbstractIn order to determine the true impact of stellar multiplicity on the formation and evolution of planets, we initiated direct imaging surveys to search for (sub)stellar companions of exoplanet host stars on close orbits, as their gravitational impact on the planet bearing disk at first and on formed planets afterwards is expected to be maximal. According to theory these are the most challenging environments for planet formation and evolution but might occur quite frequently in the milky way, due to the large number of multiple stars within our galaxy. On this poster we showed results, obtained so far in the course of our AO and Lucky-imaging campaigns of exoplanet host stars, conducted with NACO/ESO-VLT for southern and with AstraLux/CAHA2.2m for northern targets, respectively. In addition, we introduced our new high contrast imaging survey with SPHERE/ESO-VLT to search for close companions of southern exoplanet host stars, and presented some first results.

scholarly journals MEMS Deformable Mirrors for Space-Based High-Contrast Imaging

Micromachines ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 366 ◽  
Author(s):  
Rachel E. Morgan ◽  
Ewan S. Douglas ◽  
Gregory W. Allan ◽  
Paul Bierden ◽  
Supriya Chakrabarti ◽  
...  
Keyword(s):  
High Altitude ◽  
Space Environment ◽  
Optical Systems ◽  
Sounding Rocket ◽  
Deformable Mirrors ◽  
Wide Field ◽  
High Contrast ◽  
Contrast Imaging ◽  
Wavefront Control ◽  
High Contrast Imaging

Micro-Electro-Mechanical Systems (MEMS) Deformable Mirrors (DMs) enable precise wavefront control for optical systems. This technology can be used to meet the extreme wavefront control requirements for high contrast imaging of exoplanets with coronagraph instruments. MEMS DM technology is being demonstrated and developed in preparation for future exoplanet high contrast imaging space telescopes, including the Wide Field Infrared Survey Telescope (WFIRST) mission which supported the development of a 2040 actuator MEMS DM. In this paper, we discuss ground testing results and several projects which demonstrate the operation of MEMS DMs in the space environment. The missions include the Planet Imaging Concept Testbed Using a Recoverable Experiment (PICTURE) sounding rocket (launched 2011), the Planet Imaging Coronagraphic Technology Using a Reconfigurable Experimental Base (PICTURE-B) sounding rocket (launched 2015), the Planetary Imaging Concept Testbed Using a Recoverable Experiment - Coronagraph (PICTURE-C) high altitude balloon (expected launch 2019), the High Contrast Imaging Balloon System (HiCIBaS) high altitude balloon (launched 2018), and the Deformable Mirror Demonstration Mission (DeMi) CubeSat mission (expected launch late 2019). We summarize results from the previously flown missions and objectives for the missions that are next on the pad. PICTURE had technical difficulties with the sounding rocket telemetry system. PICTURE-B demonstrated functionality at >100 km altitude after the payload experienced 12-g RMS (Vehicle Level 2) test and sounding rocket launch loads. The PICTURE-C balloon aims to demonstrate 10 - 7 contrast using a vector vortex coronagraph, image plane wavefront sensor, and a 952 actuator MEMS DM. The HiClBaS flight experienced a DM cabling issue, but the 37-segment hexagonal piston-tip-tilt DM is operational post-flight. The DeMi mission aims to demonstrate wavefront control to a precision of less than 100 nm RMS in space with a 140 actuator MEMS DM.

scholarly journals SCExAO: First Results and On-Sky Performance

2013 ◽  
Vol 8 (S299) ◽  
pp. 34-35 ◽  
Author(s):  
Thayne Currie ◽  
Olivier Guyon ◽  
Frantz Martinache ◽  
Christophe Clergeon ◽  
Michael McElwain ◽  
...  
Keyword(s):  
Adaptive Optics ◽  
Focal Plane ◽  
Closed Loop ◽  
Giant Planets ◽  
Wavefront Sensor ◽  
Strehl Ratio ◽  
Wavefront Control ◽  
Contrast Gain ◽  
First Results ◽  
Plane Wavefront

AbstractWe present new on-sky results for the Subaru Coronagraphic Extreme Adaptive Optics imager (SCExAO) verifying and quantifying the contrast gain enabled by key components: the closed-loop coronagraphic low-order wavefront sensor (CLOWFS) and focal plane wavefront control (“speckle nulling”). SCExAO will soon be coupled with a high-order, Pyramid wavefront sensor which will yield > 90% Strehl ratio and enable 106–107 contrast at small angular separations allowing us to image gas giant planets at solar system scales. Upcoming instruments like VAMPIRES, FIRST, and CHARIS will expand SCExAO's science capabilities.

Self-coherent camera: first results of a high-contrast imaging bench in visible light

2010 ◽  
Author(s):  
Marion Mas ◽  
Pierre Baudoz ◽  
Gerard Rousset ◽  
Raphaël Galicher ◽  
Jacques Baudrand
Keyword(s):  
Visible Light ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
First Results

High-contrast imager for Complex Aperture Telescopes (HiCAT). 4. Status and wavefront control development

2016 ◽  
Author(s):  
Lucie Leboulleux ◽  
Mamadou N'Diaye ◽  
A. J. E. Riggs ◽  
Sylvain Egron ◽  
Johan Mazoyer ◽  
...  
Keyword(s):  
High Contrast ◽  
Wavefront Control

scholarly journals High-contrast imager for complex aperture telescopes (HiCAT): 3. first lab results with wavefront control

2015 ◽  
Author(s):  
Mamadou N'Diaye ◽  
Johan Mazoyer ◽  
Élodie Choquet ◽  
Laurent Pueyo ◽  
Marshall D. Perrin ◽  
...  
Keyword(s):  
High Contrast ◽  
Wavefront Control
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