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Imaging exoplanets with coronagraphic instruments
Comptes Rendus. Physique, 2023 Exoplanetary science is a very active field of astronomy nowadays, with questions still opened such as how planetary systems form and evolve (occurrence, process), why such a diversity of exoplanets is observed (mass, radius, orbital parameters ...
Galicher, Raphaël, Mazoyer, Johan
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Speckle noise and dynamic range in coronagraphic images [PDF]
The Astrophysical Journal, 2007 This paper is concerned with the theoretical properties of high contrast coronagraphic images in the context of exoplanet searches. We derive and analyze the statistical properties of the residual starlight in coronagraphic images, and describe the ...
Andre Ferrari +15 more
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MEMS Deformable Mirrors for Space-Based High-Contrast Imaging [PDF]
Micromachines, 2019 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
Rachel E. Morgan +19 more
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High contrast imaging wavefront sensor referencing from coronagraphic images [PDF]
Techniques and Instrumentation for Detection of Exoplanets X, 2021 A key challenge of high contrast imaging (HCI) is to differentiate a speckle from an exoplanet signal. The sources of speckles are a combination of atmospheric residuals and aberrations in the non-common path. Those non-common path aberrations (NCPA) are particularly challenging to compensate for as they are not directly measured, and because they ...
Skaf, Nour +13 more
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Coronagraphic phase diversity: performance study and laboratory demonstration [PDF]
, 2013 The final performance of current and future instruments dedicated to exoplanet detection and characterization (such as SPHERE on the European Very Large Telescope, GPI on Gemini North, or future instruments on Extremely Large Telescopes) is limited by ...
Mugnier, L. M. +2 more
core +16 more sources
Speckle lifetime in XAO coronagraphic images: temporal evolution of SPHERE coronagraphic images [PDF]
SPIE Proceedings, 2016 18 pages, 20 ...
Milli, J. +16 more
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Rectangular-Mask Coronagraphs for High-Contrast Imaging [PDF]
The Astrophysical Journal, 2004 We present yet another new family of masks for high-contrast imaging as required for the to-be-built terrestrial planet finder space telescope. The ``best'' design involves a square entrance pupil having a 4-vane spider, a square image-plane mask containing a plus-sign shaped occulter to block the starlight inside 0.6 lambda/D, and a Lyot-plane mask ...
Vanderbei, Robert J. +2 more
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First Observations of the Brown Dwarf HD 19467 B with JWST
The Astrophysical Journal, 2023 We observed HD 19467 B with JWST’s NIRCam in six filters spanning 2.5–4.6 μ m with the long-wavelength bar coronagraph. The brown dwarf HD 19467 B was initially identified through a long-period trend in the radial velocity of the G3V star HD 19467.
Alexandra Z. Greenbaum +23 more
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The Astronomical Journal, 2023 With a Jupiter-like exoplanet and a debris disk with both asteroid and Kuiper Belt analogs, ϵ Eridani has a fascinating resemblance to our expectations for a young solar system.
Schuyler Grace Wolff +4 more
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Square Root Compression and Noise Effects in Digitally Transformed Images
The Astrophysical Journal, 2022 We report on a particular example of noise and data representation interacting to introduce systematic error into scientific measurements. Many instruments collect integer digitized values and apply nonlinear coding, in particular square root coding, to ...
Craig E. DeForest +3 more
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