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Academic literature on the topic 'Coronagraphs'

Author: Grafiati

Published: 4 June 2021

Last updated: 30 July 2024

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Journal articles on the topic "Coronagraphs"

1

Leboulleux, Lucie, Alexis Carlotti, and Mamadou N’Diaye. "Redundant apodization for direct imaging of exoplanets." Astronomy & Astrophysics 659 (March 2022): A143. http://dx.doi.org/10.1051/0004-6361/202142410.

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Context. Direct imaging and spectroscopy of Earth-like planets and young Jupiters require contrast values up to 106−1010 at angular separations of a few dozen milliarcseconds. To achieve this goal, one of the most promising approaches consists of using large segmented primary mirror telescopes with coronagraphic instruments. While they are able to reach high contrast at small angular separations, coronagraphs are highly sensitive to wavefront errors, however. The segmentation itself is responsible for phasing errors and segment-level vibrations that have to be controlled at a subnanometric acc

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Dube, Brandon D., A. J. Riggs, Brian D. Kern, et al. "Exascale integrated modeling of low-order wavefront sensing and control for the Roman Coronagraph instrument." Journal of the Optical Society of America A 39, no. 12 (2022): C133. http://dx.doi.org/10.1364/josaa.472364.

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Astronomical instruments to detect exoplanets require extreme wavefront stability. For these missions to succeed, comprehensive and precise modeling is required to design and analyze suitable coronagraphs and their wavefront control systems. In this paper, we describe techniques for integrated modeling at scale that is, to the best of our knowledge, 1000 times faster than previously published works. We show how this capability has been used to validate performance and perform uncertainty quantification for the Roman Coronagraph instrument. Finally, we show how this modeling capacity may be nec

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Mierla, M., B. Inhester, A. Antunes, et al. "On the 3-D reconstruction of Coronal Mass Ejections using coronagraph data." Annales Geophysicae 28, no. 1 (2010): 203–15. http://dx.doi.org/10.5194/angeo-28-203-2010.

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Abstract. Coronal Mass ejections (CMEs) are enormous eruptions of magnetized plasma expelled from the Sun into the interplanetary space, over the course of hours to days. They can create major disturbances in the interplanetary medium and trigger severe magnetic storms when they collide with the Earth's magnetosphere. It is important to know their real speed, propagation direction and 3-D configuration in order to accurately predict their arrival time at the Earth. Using data from the SECCHI coronagraphs onboard the STEREO mission, which was launched in October 2006, we can infer the propagati

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Itoh, Satoshi, та Taro Matsuo. "A Coronagraph with a Sub-λ/D Inner Working Angle and a Moderate Spectral Bandwidth". Astronomical Journal 163, № 6 (2022): 279. http://dx.doi.org/10.3847/1538-3881/ac658a.

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Abstract Future high-contrast imaging spectroscopy with a large segmented telescope will be able to detect atmospheric molecules of Earth-like planets around G- or K-type main-sequence stars. Increasing the number of target planets will require a coronagraph with a small inner working angle (IWA), and wide spectral bandwidth is required if we enhance a variety of detectable atmospheric molecules. To satisfy these requirements, in this paper, we present a coronagraphic system that provides an IWA less than 1λ 0/D over a moderate wavelength band, where λ 0 is the design-center wavelength and D d

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Xin, Yinzi, Laurent Pueyo, Romain Laugier, et al. "Coronagraphic Data Post-processing Using Projections on Instrumental Modes." Astrophysical Journal 963, no. 2 (2024): 96. http://dx.doi.org/10.3847/1538-4357/ad1879.

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Abstract Directly observing exoplanets with coronagraphs is impeded by the presence of speckles from aberrations in the optical path, which can be mitigated in hardware with wave front control, as well as in post-processing. This work explores using an instrument model in post-processing to separate astrophysical signals from residual aberrations in coronagraphic data. The effect of wave front error (WFE) on the coronagraphic intensity consists of a linear contribution and a quadratic contribution. When either of the terms is much larger than the other, the instrument response can be approxima

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Kenworthy, Matthew A., Sascha Quanz, Gilles Otten, et al. "Successes and challenges of the APP Coronagraph." Proceedings of the International Astronomical Union 8, S299 (2013): 40–41. http://dx.doi.org/10.1017/s1743921313007771.

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AbstractThe Apodizing Phase Plate (APP) coronagraph has been used to image the exoplanet β Pictoris b and the protoplanet candidate around HD 100546, and is currently in use in surveys with NaCo at the VLT. Its success is due to its tolerance to tip-tilt pointing errors in current AO systems, which degrade the performance of nearly all other coronagraphs. Currently the sensitivity of the APP is limited by non-common path errors in the science camera systems and by its chromatic behaviour. We present the achromatized Vector APP coronagraph and address how we will measure and minimise non-common

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Smartt, Raymond N., Serge Koutchmy, and Jacques-Clair NoëNs. "Near-IR Solar Coronal Observations with New-Technology Reflecting Coronographs." Symposium - International Astronomical Union 154 (1994): 603–8. http://dx.doi.org/10.1017/s0074180900124908.

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Emission-line and K-coronal observations in the IR have the significant advantage of reduced sky brightness compared with the visible, while the effects of seeing are also reduced. Moreover, strong lines are available in the near-IR. Examples of the current capabilities of IR coronal observations using conventional Lyot coronagraphs are discussed briefly. Photometric measurements using the two IR lines of Fe XIII (10,747 Å and 10,798 Å), together with the Fe XIII 3,388 Å line, have provided a valuable electron-density diagnostic, but with low-angular-resolution. The 10,747 Å line has high intr

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Mawet, Dimitri, and Pierre Riaud. "Subwavelength gratings for phase mask coronagraphy: the 4QZOG and AGPM coronagraphs." Proceedings of the International Astronomical Union 1, no. C200 (2005): 361–66. http://dx.doi.org/10.1017/s1743921306009598.

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Leboulleux, Lucie, Jean-François Sauvage, Rémi Soummer, et al. "Experimental validation of coronagraphic focal-plane wavefront sensing for future segmented space telescopes." Astronomy & Astrophysics 639 (July 2020): A70. http://dx.doi.org/10.1051/0004-6361/202037658.

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Context. Direct imaging of Earth-like planets from space requires dedicated observatories, combining large segmented apertures with instruments and techniques such as coronagraphs, wavefront sensors, and wavefront control in order to reach the high contrast of 1010 that is required. The complexity of these systems would be increased by the segmentation of the primary mirror, which allows for the larger diameters necessary to image Earth-like planets but also introduces specific patterns in the image due to the pupil shape and segmentation and making high-contrast imaging more challenging. Amon

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Galicher, R., E. Huby, P. Baudoz, and O. Dupuis. "A family of phase masks for broadband coronagraphy example of the wrapped vortex phase mask theory and laboratory demonstration." Astronomy & Astrophysics 635 (February 28, 2020): A11. http://dx.doi.org/10.1051/0004-6361/201936971.

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Context. Future instruments need efficient coronagraphs over large spectral ranges to enable broadband imaging or spectral characterization of exoplanets that are 108 times fainter than their star. Several solutions have been proposed. Pupil apodizers can attenuate the star intensity by a factor of 1010 but they only transmit a few percent of the light of the planet. Cascades of phase and/or amplitude masks can both attenuate the starlight and transmit most of the planet light, but the number of optics that require alignment makes this solution impractical for an instrument. Finally, vector ph

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Dissertations / Theses on the topic "Coronagraphs"

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Chipman, Russell A. "Image formation in coronagraphs due to mirror polarization aberrations." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627180.

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The PSF for astronomical telescopes and instruments depends not only on geometric wavefront aberrations, but also on those polarization aberrations from the polarization properties of reflecting and transmitting surfaces. The image plane irradiance distribution is the linear superposition of four PSF images: one for each of the two orthogonal polarizations and one for each of two cross-coupled polarization terms.

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Knight, Justin M., John Brewer, Ryan Hamilton, Olivier Guyon, Thomas D. Milster, and Karen Ward. "Design, fabrication, and testing of stellar coronagraphs for exoplanet imaging." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627078.

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Complex-mask coronagraphs destructively interfere unwanted starlight with itself to enable direct imaging of exoplanets. This is accomplished using a focal plane mask (FPM); a FPM can be a simple occulter mask, or in the case of a complex-mask, is a multi-zoned device designed to phase-shift starlight over multiple wavelengths to create a deep achromatic null in the stellar point spread function. Creating these masks requires microfabrication techniques, yet many such methods remain largely unexplored in this context. We explore methods of fabrication of complex FPMs for a Phased-Induced Ampli

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Newman, Kevin, Dan Sirbu, Ruslan Belikov, and Olivier Guyon. "Development of PIAA Complex Mask Coronagraphs for large aperture ground-based telescopes." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622426.

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The Phase Induced Amplitude Apodization Complex Mask Coronagraph (PIAACMC) is an architecture for directly observing extrasolar planets, and can achieve performance near the theoretical limits for any direct-detection instrument. The PIAACMC architecture includes aspheric PIAA optics, and a complex phase-shifting focal plane mask that provides a pi phase shift to a portion of the on-axis starlight. The phase-shifted starlight is forced to interfere destructively with the un-shifted starlight, causing the starlight to be eliminated, and allowing a region for high-contrast imaging near the star.

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Martinez, Patrice. "Coronagraphs characterization for high-contrast imaging in the context of extremely large telescopes." Paris 7, 2008. http://www.theses.fr/2008PA077208.

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Cette thèse s'inscrit dans le contexte de la détection directe de planètes extra-solaires avec les futures très grand télescopes au sol (30 à 42 mètres de diamètre). Les contrastes requis pour une telle détection nécessitent l'utilisation de système d'optique adaptative pour corriger les effets de la turbulence atmosphérique et de coronographes stellaires pour atténuer le flux de l'étoile dans lequel le signal de la planète est noyé. Le but de cette étude est donc d'optimiser, de comparer et de sélectionner les concepts de coronographes stellaires les plus adaptés aux contraintes imposées par

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Braga, Carlos Roberto. "Study of coronal mass ejections and their corresponding interplanetary structures using combined observations of cosmic ray detectors and coronagraphs." Instituto Nacional de Pesquisas Espaciais (INPE), 2015. http://urlib.net/sid.inpe.br/mtc-m21b/2015/01.30.19.09.

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This Thesis aims to study coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) using remove sensing observations from the solar corona, interplanetary in situ data and observations from ground-based cosmic ray detectors. CMEs have a central role on the Sun-Earth relationships because they are one of the main sources of geomagnetic disturbances. We have started the analysis by using a list of magnetic clouds (MCs) observed in the Earth-vicinity from 2008 to 2011. After probing the interplanetary structure, we identified the CMEs ejected in appropriate time and direction t

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Jovanovic, N., O. Guyon, J. Lozi, et al. "The SCExAO high contrast imager: transitioning from commissioning to science." SPIE-INT SOC OPTICAL ENGINEERING, 2016. http://hdl.handle.net/10150/622018.

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SCExAO is the premier high-contrast imaging platform for the Subaru Telescope. It offers high Strehl ratios at near-IR wavelengths (y-K band) with stable pointing and coronagraphs with extremely small inner working angles, optimized for imaging faint companions very close to the host. In the visible, it has several interferometric imagers which offer polarimetric and spectroscopic capabilities. A recent addition is the RHEA spectrograph enabling spatially resolved high resolution spectroscopy of the surfaces of giant stars, for example. New capabilities on the horizon include post-coronagraphi

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Chipman, Russell A. "Challenges in coronagraph optical design." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/627190.

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The point spread function (PSF) for astronomical telescopes and instruments depends not only on geometric aberrations and scalar wave diffraction, but also on the apodization and wavefront errors introduced by coatings on reflecting and transmitting surfaces within the optical system. Geometrical ray tracing provides incomplete image simulations for exoplanet coronagraphs with the goal of resolving planets with a brightness less than 10<^>-9 of their star located within 3 Airy disk radii. The Polaris-M polarization analysis program calculates uncorrected coating polarization aberrations couple

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Pueyo, Laurent, Neil Zimmerman, Matthew Bolcar, et al. "The LUVOIR architecture ``A'' coronagraph instrument." SPIE-INT SOC OPTICAL ENGINEERING, 2017. http://hdl.handle.net/10150/626292.

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In preparation for the Astro 2020 Decadal Survey NASA has commissioned the study four flagship missions spanning to a wide range of observable wavelengths: the Origins Space Telescope (OST, formerly the Far-Infrared Surveyor), Lynx (formerly the X-ray Surveyor), the Large UV/Optical/Infrared Surveyor (LUVOIR) and the Habitable Exoplanet Imager (HabEx). One of the key scientific objectives of the latter two is the detection and characterization of the earth-like planets around nearby stars using the direct imaging technique (along with a broad range of investigations regarding the architecture

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Alagao, Mary Angelie. "Characterization and optimization of the Evanescent Wave Coronagraph." Electronic Thesis or Diss., Saint-Etienne, 2023. http://www.theses.fr/2023STET0060.

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L’imagerie directe des exoplanètes reste difficile en raison du contraste élevé et de la faible séparation angulaire entre l'étoile et la planète. Cela nécessite de supprimer l'éblouissement dû à l'étoile et de s'assurer que la lumière faible de la planète n'est pas noyée au milieu de divers bruits. La détection dépend de la maturité des techniques et des algorithmes utilisés, tout en tenant compte des compromis importants sur le contraste brut, la résolution angulaire et la transmission. L'une de ses composantes clés est l'utilisation de coronagraphes - des instruments ayant pour seul but de

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Thompson, Samantha Jayne. "OSCA, an Optimised Stellar Coronagraph for Adaptive optics." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1338360/.

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Described here is the design, manufacturing, testing and commissioning of a coronagraph facility for the 4.2 metre William Herschel Telescope (WHT) and its adaptive optics system (NAOMI). The use of the NAOMI adaptive optics system gives an improved image resolution of ~ 0.15 arcseconds at a wavelength of 2.2μm. This enables the Optimised Stellar Coronagraph for Adaptive optics (OSCA) to null stellar light with smaller occulting masks and thus allows regions closer to bright astronomical objects to be imaged. OSCA is a fully deployable instrument which when in use leaves the focus of the NAOMI

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Books on the topic "Coronagraphs"

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Calif.) Coronagraph Workshop (2006 Pasadena. Coronagraph workshop 2006: Coronagraph Workshop papers : 28-29 September, 2006, Pasadena, CA. Jet Propulsion Laboratory, California Institute of Technology, 2006.

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Mazereau, Pascal. A la poursuite du soleil: La construction du coronographe d'amateur. Eyrolles, 1985.

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Workshop, National Solar Observatory/Sacramento Peak Summer. Infrared tools for solar astrophysics: What's next? : proceeedings of the fifteenth National Solar Observatory/Sacramento Peak Summer Workshop, Sunspot, New Mexico, USA, 19-22 September 1994. World Scientific, 1995.

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Shaklan, Stuart B. Techniques and instrumentation for detection of exoplanets V: 23-24 August 2011, San Diego, California, United States. SPIE, 2011.

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Soummer, R. Astronomy with high contrast imaging II: Instrumentation for coronagraphy and nulling interferometry, Nice, France, October 6-10, 2003. EDP Sciences, 2004.

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Society of Photo-optical Instrumentation Engineers, ed. Techniques and instrumentation for detection of exoplanets III: 28-30 August 2007, San Diego, California, USA. SPIE, 2007.

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United States. National Aeronautics and Space Administration., ed. [Coronagraphic observations and analyses of the ultraviolet solar corona. National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., ed. [Coronagraphic observations and analyses of the ultraviolet solar corona. National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration, ed. Spacelab Lyman alpha-white light coronagraph program: Final report for the period 12 March 1980 through 1 October 1983. National Aeronautics and Space Administration, 1986.

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United States. National Aeronautics and Space Administration., ed. Spacelab Lyman alpha-white light coronagraph program: Final report for the period 12 March 1980 through 1 October 1983. National Aeronautics and Space Administration, 1986.

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Book chapters on the topic "Coronagraphs"

1

Rouan, Daniel. "Coronagraphy." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_356.

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Rouan, Daniel. "Coronagraphy." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_356.

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Rouan, Daniel. "Coronagraphy." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_356-2.

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Rouan, Daniel. "Coronagraphy." In Encyclopedia of Astrobiology. Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-65093-6_356.

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Noci, G., J. L. Kohl, M. C. E. Huber, et al. "The Ultraviolet Coronagraph Spectrometer." In Lecture Notes in Physics. Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/3-540-59109-5_56.

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Boccaletti, Anthony, Jean-Charles Augereau, Gaël Chauvin, et al. "Lyot Coronagraphy at the Palomar and Phase-Mask Coronagraphy at the VLT." In Science with Adaptive Optics. Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/10828557_4.

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Rabbia, Yves, Pierre Baudoz, and Jean Gay. "Achromatic Interfero-Coronagraphy and VLT." In Scientific Drivers for ESO Future VLT/VLTI Instrumentation. Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-43215-0_44.

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Gay, J., Y. Rabbia, and C. Manghini. "Interfero-Coronagraphy Using Pupil π-Rotation." In Infrared Space Interferometry: Astrophysics & the Study of Earth-Like Planets. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5468-0_25.

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Fisher, R. R., and M. Guhathakurta. "SPARTAN 201 White Light Coronagraph Experiment." In Mass Supply and Flows in the Solar Corona. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0930-7_45.

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Brueckner, G. E., R. A. Howard, M. J. Koomen, et al. "The Large Angle Spectroscopic Coronagraph (LASCO)." In The SOHO Mission. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-009-0191-9_10.

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Conference papers on the topic "Coronagraphs"

1

Ftaclas, Christ, Edward T. Siebert, and Richard J. Terrile. "A High Efficiency Coronagraph for Astronomical Applications." In Space Optics for Astrophysics and Earth and Planetary Remote Sensing. Optica Publishing Group, 1988. http://dx.doi.org/10.1364/soa.1988.wa5.

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Direct detection of extra-solar planetary systems is one of a class of astronomical problems requiring a significant reduction of diffracted light within a few arcseconds of a bright point source. Traditional approaches to diffraction reduction control have included pupil plane apodization, which extracts enormous penalties in effective collecting area to obtain small angle performance, and coronagraphs, in which high efficiency requires extensive occultation of the central source giving up a valuable portion of the field of view. We have developed a hybrid, high efficiency, coronagraph which

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Watson, Steven M., and James P. Mills. "Incorporating coronographs with segmented telescopic systems for extrasolar planetary imaging." In OSA Annual Meeting. Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.wv2.

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Detection of nonsolar planets is a challenging problem. Due to the planets' faintness relative to the star, it is necessary to suppress the stellar diffracted energy to very low levels. In addition, the planets' proximity to the star requires large diameter optics. This research examines various multiaperture and segmented telescopic systems incorporating Lyot coronagraphs to suppress the stellar diffracted energy and provide the required resolution so that the extrasolar planets can be directly imaged. Because of the phasing tolerances and required contrast ratios, the IR band of 10.5-13.5 µm

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Smartt, Raymond N., Serge Koutchmy, and Eugene W. Cross. "Reflecting coronagraph designs with specialized applications." In OSA Annual Meeting. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.thtt2.

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With improvements in super-polished mirror technology, coronagraphs can be designed based on mirror objectives. Reflecting coronagraphs provide superior performance capabilities compared with classical singlet-lens-objective Lyot coronagraphs. Specifically, an all-reflecting design has the advantage of full achromaticity; wavelength coverage is limited only by atmospheric spectral transmittance, mirror reflectance, and detector response, and simple heat-flux rejection is inherent in the design. Further, large-aperture systems can be designed to be capable of producing high-angular-resolution i

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Swartzlander, Grover, Gregory Foo, David Palacios, Eric Christensen, Heidi Hockel, and Eric Johnson. "Optical vortex coronagraphs." In Frontiers in Optics. OSA, 2004. http://dx.doi.org/10.1364/fio.2004.fwt1.

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Cash, W. "Demonstrating exoplanet coronagraphs." In 2012 IEEE Aerospace Conference. IEEE, 2012. http://dx.doi.org/10.1109/aero.2012.6187184.

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Carpenter, Joel, Nicolas K. Fontaine, Barnaby R. M. Norris, and Sergio Leon-Saval. "Spatial mode sorter coronagraphs." In Conference on Lasers and Electro-Optics/Pacific Rim. OSA, 2020. http://dx.doi.org/10.1364/cleopr.2020.c6g_3.

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Lillie, Charles F., Martin Flannery, and Dean Dailey. "Segmented telescopes for coronagraphs." In SPIE Astronomical Telescopes + Instrumentation, edited by John C. Mather. SPIE, 2004. http://dx.doi.org/10.1117/12.552348.

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Desai, Niyati, Jorge Llop-Sayson, Arielle Bertrou-Cantou, et al. "Progress in scalar vortex coronagraphs." In Space Telescopes and Instrumentation 2022: Optical, Infrared, and Millimeter Wave, edited by Laura E. Coyle, Marshall D. Perrin, and Shuji Matsuura. SPIE, 2022. http://dx.doi.org/10.1117/12.2630950.

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Traub, Wesley A., Ruslan Belikov, Olivier Guyon, et al. "Science yield estimation for AFTA coronagraphs." In SPIE Astronomical Telescopes + Instrumentation, edited by Jacobus M. Oschmann, Mark Clampin, Giovanni G. Fazio, and Howard A. MacEwen. SPIE, 2014. http://dx.doi.org/10.1117/12.2054834.

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Bloemhof, Eric E. "Speckle noise in highly corrected coronagraphs." In Optical Science and Technology, the SPIE 49th Annual Meeting, edited by John D. Gonglewski, Mark T. Gruneisen, and Michael K. Giles. SPIE, 2004. http://dx.doi.org/10.1117/12.560370.

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Reports on the topic "Coronagraphs"

1

Karovska, Margarita. Enhancement of Lasco C1, C2, and C3 Coronagraph Images. Defense Technical Information Center, 1999. http://dx.doi.org/10.21236/ada359690.

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Altrock, Richard C. Ground-Based Coronagraphic Observations of Solar Streamers. Defense Technical Information Center, 1992. http://dx.doi.org/10.21236/ada267259.

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Kim, Iraida S. Mirror Coronagraphic Device - Development and Manufacture of a Reflecting Coronagraphic Device for Application in a Low-Scattered Light Telescope. Defense Technical Information Center, 1997. http://dx.doi.org/10.21236/ada327249.

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Karpen, Judith T. A Search for Precursor Activity Associated with Coronal Mass Ejections, Using White-Light Coronagraph Observations Obtained with the SOLWIND Instrument on Board the Air Force P78-1 Satellite. Defense Technical Information Center, 1985. http://dx.doi.org/10.21236/ada170139.

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