Results 71 to 80 of about 1,731,322 (198)

Coronagraphic Imaging with HST and STIS

, 2002
Revealing faint circumstellar nebulosity and faint stellar or substellar companions to bright stars typically requires use of techniques for rejecting the direct, scattered, and diffracted light of the star. One such technique is Lyot coronagraphy.
Heap, S. R., Plait, P., Lindler, D., Malumuth, E., Woodgate, B. E., Bowers, C. W., Kimble, R. A., Proffitt, C., Gull, T. R., Grady, C. A.   +9 more
core  

Mapping Ground-based Coronagraphic Images to Helioprojective-Cartesian Coordinate System by Image Registration

The Astrophysical Journal
A few ground-based solar coronagraphs have been installed in western China for observing the low-layer corona in recent years. However, determining the helioprojective coordinates for the coronagraphic data with high precision is an important but ...
Feiyang Sha, Yu Liu, Lidong Xia, Yao Chen, Qing Zhou, Yangrui Chen, Chuyu Zhong, Xuefei Zhang, Tengfei Song, Mingzhe Sun, Xiaoyu Yu, Haitang Li, Jacob Oloketuyi, Qiang Liu, Xinjian Wang, Qiwang Luo, Xiaobo Li   +16 more
doaj   +1 more source

HLMiller-Imaging/SlowMembraneDiffusionAnalysis: Version 1

<h2>What's Changed</h2> <ul> <li>Addcode by @HLMiller-Imaging in https://github.com/HLMiller-Imaging/SlowMembraneDiffusionAnalysis/pull/1</li> <li>TrajectoryBugFix by @HLMiller-Imaging in https://github.com/HLMiller ...
HLMiller-Imaging
core   +1 more source

Joint Diagnostics of Circumsolar Sky Brightness Using Coronagraphic Measurements and Aerosol Optical Inversions at Maunaloa

The Astrophysical Journal
Atmospheric aerosols strongly influence daytime sky quality for solar coronal imaging, yet few studies directly link aerosol properties and sky brightness measurements within ∼2° of the Sun. Here, we compare externally occulted coronagraphic measurements
Thomas A. Schad, Paul Bryans, André Fehlmann, Sarah Gibson, David M. Harrington, Lucas A. Tarr, Steven Tomczyk, Jeffrey G. Yepez   +7 more
doaj   +1 more source

Exoplanet Imaging with a Phase‐induced Amplitude Apodization Coronagraph. III. Diffraction Effects and Coronagraph Design

The Astrophysical Journal, 2006
Properly apodized pupils can deliver point-spread functions (PSFs) free of Airy rings and are suitable for high dynamical range imaging of extrasolar terrestrial planets (ETPs). To reach this goal, classical pupil apodization (CPA) unfortunately requires most of the light gathered by the telescope to be absorbed, resulting in poor throughput and low ...
Eugene A. Pluzhnik, Olivier Guyon, Stephen T. Ridgway, Frantz Martinache, Robert A. Woodruff, Celia Blain, Raphael Galicher   +6 more
openaire   +1 more source

Digital Imaging Program fact sheet

, 2004
Title from PDF caption (viewed May 11, 2007).; "January 2004."; Previously issued: Fact sheet / Digital Imaging Program. [Hartford] : State of Connecticut, Dept. of Social Services, [1996]
Digital Imaging Program (Conn.)
core   +1 more source

OPTIMIZED PRINCIPAL COMPONENT ANALYSIS ON CORONAGRAPHIC IMAGES OF THE FOMALHAUT SYSTEM

The Astrophysical Journal, 2013
We present the results of a study to optimize the principal component analysis (PCA) algorithm for planet detection, a new algorithm complementing ADI and LOCI for increasing the contrast achievable next to a bright star. The stellar PSF is constructed by removing linear combinations of principal components, allowing the flux from an extrasolar planet ...
Tiffany Meshkat, Matthew A. Kenworthy, Sascha P. Quanz, Adam Amara   +3 more
openaire   +3 more sources

Post-coronagraphic wavefront sensing and control for exoplanet imaging

, 2018
L’imagerie d’exoplanètes est limitée par deux obstacles intrinsèques : le faible écart angulaire entre planète et étoile, et le très faible flux lumineux en provenance de la planète par rapport à la lumière de l’étoile.
Herscovici-Schiller, Olivier
core  

Forward Modeling of Dust-induced Stray Light in Ground-based Coronagraphs: A Dual-path Monitoring Approach for High-precision Inner Corona Observations

The Astrophysical Journal
High-precision ground-based observations of the inner corona (1.05–2.0 R _⊙ ) are fundamentally constrained by instrumental stray light, particularly the additive background from dynamic dust accumulation on the objective lens.
Xiande Liu, Xuefei Zhang, Yu Liu, Tengfei Song, Mingyu Zhao, Mingzhe Sun, Feiyang Sha, Jun Fang   +7 more
doaj   +1 more source

Wide-spectral-band Nuller Insensitive to Finite Stellar Angular Diameter with a One-dimensional Diffraction-limited Coronagraph

The Astronomical Journal
Potentially habitable planets around nearby stars less massive than solar-type stars could join targets of the spectroscopy of the planetary reflected light with future space telescopes.
Satoshi Itoh, Taro Matsuo, Motohide Tamura   +2 more
doaj   +1 more source