Results 1 to 10 of about 217 (162)
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 Abstract The 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. In order to design instruments, correct quasi-static aberrations or analyse data, the expression of the ...
Laurent Mugnier +1 more
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Compatibility of a Diffractive Pupil and Coronagraphic Imaging [PDF]
Publications of the Astronomical Society of the Pacific, 2013 Detection and characterization of exo-earths require direct-imaging techniques that can deliver contrast ratios of 10(exp 10) at 100 milliarc-seconds or smaller angular separation. At the same time, astrometric data is required to measure planet masses and can help detect planets and constrain their orbital parameters. To minimize costs, a single space
Olivier Guyon +2 more
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Near-IR coronagraphic imaging of the companion to HR 7672 [PDF]
Astronomy and Astrophysics, 2003 This 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 in $J$($1.2μm$), $H$($1.6μm$) and $K_s$ ($2.2μm$) bands to cover the full near-IR domain and hence to further ...
Franck Marchis, Gael Chauvin
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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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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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Model of the Search for Extraterrestrial Intelligence with Coronagraphic Imaging [PDF]
The Astronomical Journal, 2019 Abstract We present modeled detection limits of the Gemini Planet Imager (GPI) and the Wide-Field Infrared Space Telescope (WFIRST) to an optical and infrared laser which could be used by an extraterrestrial civilization to signal their presence.
Christina L. Vides +5 more
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Speckle Noise and Dynamic Range in Coronagraphic Images [PDF]
The Astrophysical Journal, 2007 31 pages, 18 ...
Soummer, R. (Rémi) +3 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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Speckle statistics in direct and coronagraphic imaging [PDF]
Proceedings of the International Astronomical Union, 2005 In this communication, we study the statistical properties of the light intensity in direct and coronagraphic images, in the context of ground-based Extreme Adaptive Optics observations. The same approach can also be used for space observations with different scales.
Soummer, R. +8 more
openaire +2 more sources