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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
doaj +6 more sources
An analytic expression for coronagraphic imaging through turbulence. Application to on-sky coronagraphic phase diversity [PDF]
Monthly Notices of the Royal Astronomical Society: Letters, 2017 International audienceThe ultimate performance of coronagraphic high-contrast exoplanet imaging systems such as SPHERE or GPI is limited by quasi-static aberrations. These aberrations produce speckles that can be mistaken for planets in the image.
Laurent M Mugnier
exaly +4 more sources
Near-IR coronagraphic imaging of the companion to HR 7672 [PDF]
Astronomy and Astrophysics, 2003 6 pages, 9 figuresThis article presents coronagraphic images of the low-mass companion to the star HR 7672 observed at the Palomar 200 inch telescope and first detected at Gemini and Keck in the K band by \\citet{liu02}. We obtained additional photometry
G Chauvin +2 more
exaly +5 more sources
The Subaru Coronagraphic Extreme Adaptive Optics System: Enabling High-Contrast Imaging on Solar-System Scales [PDF]
Publications of the Astronomical Society of the Pacific, 2015 The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is a multipurpose high-contrast imaging platform designed for the discovery and detailed characterization of exoplanetary systems and serves as a testbed for high-contrast imaging ...
Nemanja Jovanović +2 more
exaly +4 more sources
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
doaj +2 more sources
Coronagraphic phase diversity: a simple focal plane sensor for high-contrast imaging
Optics Letters, 2012 International audienceExoplanet direct imaging is a challenging goal of today's astronomical instrumentation. Several high-contrast imaging instruments dedicated to this task are currently being integrated; they are ultimately limited by the presence of ...
J -F Sauvage, Laurent M Mugnier
exaly +3 more sources
SPECKLE NOISE SUBTRACTION AND SUPPRESSION WITH ADAPTIVE OPTICS CORONAGRAPHIC IMAGING
Astrophysical Journal, 2012 Future ground-based direct imaging of exoplanets depends critically on high-contrast coronagraph and wave-front manipulation. A coronagraph is designed to remove most of the unaberrated starlight.
Deqing Ren +2 more
exaly +2 more sources
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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Parameter Distributions for the Drag‐Based Modeling of CME Propagation
Space Weather, Volume 20, Issue 9, September 2022., 2022 Abstract In recent years, ensemble modeling has been widely employed in space weather to estimate uncertainties in forecasts. We here focus on the ensemble modeling of Coronal Mass Ejections (CME) arrival times and arrival velocities using a drag‐based model, which is well‐suited for this purpose due to its simplicity and low computational cost ...
Gianluca Napoletano +9 more
wiley +1 more source
Space Weather, Volume 20, Issue 7, July 2022., 2022 Abstract The forecasting of the Time‐of‐Arrival (ToA) of coronal mass ejections (CMEs) to Earth does not yet meet most Space Weather users' requirements. The main physical reason is our incomplete understanding of CME propagation in the inner heliosphere.
Evangelos Paouris, Angelos Vourlidas
wiley +1 more source