Results 11 to 20 of about 221 (177)

Speckle lifetime in XAO coronagraphic images: temporal evolution of SPHERE coronagraphic images [PDF]

SPIE Proceedings, 2016
18 pages, 20 ...
Milli, J., Banas, T., Mouillet, D., Mawet, D., Girard, J. H., Vigan, Arthur, Boccaletti, A., Kasper, M., Wahhaj, Zahed, Lagrange, A. M., Beuzit, J.-L., Fusco, T., Sauvage, J.-F., Galicher, R., Marchetti, Enrico, Close, Laird, Véran, Jean-Pierre   +16 more
openaire   +3 more sources

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, Bruce Macintosh, Breanna A. Binder, Robert J. De Rosa, Jean-Baptiste Ruffio, Dmitry Savransky   +5 more
openaire   +2 more sources

Speckle Noise and Dynamic Range in Coronagraphic Images [PDF]

The Astrophysical Journal, 2007
31 pages, 18 ...
Soummer, R. (Rémi), Ferrari, André, Aime, C. (Claude), Jolissaint, Laurent   +3 more
openaire   +3 more sources

Deriving CME Density From Remote Sensing Data and Comparison to In‐Situ Measurements

Journal of Geophysical Research: Space Physics, Volume 126, Issue 1, January 2021., 2021
Abstract We determine the three‐dimensional geometry and deprojected mass of 29 well‐observed coronal mass ejections (CMEs) and their interplanetary counterparts (ICMEs) using combined Solar Terrestrial Relations Observatory ‐ Solar and Heliospheric Observatory white‐light data.
M. Temmer, L. Holzknecht, M. Dumbović, B. Vršnak, N. Sachdeva, S. G. Heinemann, K. Dissauer, C. Scolini, E. Asvestari, A. M. Veronig, S. J. Hofmeister   +10 more
wiley   +1 more source

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., Aimé, Carole, Ferrari, Anthony, Sivaramakrishnan, A., Jolissaint, L., Lloyd, J., Oppenheimer, B., Makidon, R., Carbillet, M.   +8 more
openaire   +2 more sources

Performance of the near-infrared coronagraphic imager on Gemini-South [PDF]

SPIE Proceedings, 2008
We present the coronagraphic and adaptive optics performance of the Gemini-South Near-Infrared Coronagraphic Imager (NICI). NICI includes a dual-channel imager for simultaneous spectral difference imaging, a dedicated 85-element curvature adaptive optics system, and a built-in Lyot coronagraph.
Chun, Mark, Toomey, Doug, Wahhaj, Zahed, Biller, Beth, Artigau, Etienne, Hayward, Tom, Liu, Mike, Close, Laird, Hartung, Markus, Rigaut, Francois, Ftaclas, Christ   +10 more
openaire   +2 more sources

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, Chris Lowder, Daniel B. Seaton, Matthew J. West   +3 more
doaj   +1 more source

Wavefront Sensing by a Common-Path Interferometer for Wavefront Correction in Phase and Amplitude by a Liquid Crystal Spatial Light Modulator Aiming the Exoplanet Direct Imaging

Photonics, 2023
We implemented the common-path achromatic interfero-coronagraph both for the wavefront sensing and the on-axis image component suppression, aiming for the stellar coronagraphy.
Andrey Yudaev, Alexander Kiselev, Inna Shashkova, Alexander Tavrov, Alexander Lipatov, Oleg Korablev   +5 more
doaj   +1 more source

Space Weather Monitor at the L5 Point: A Case Study of a CME Observed with STEREO B

Space Weather, Volume 18, Issue 10, October 2020., 2020
Abstract An important location for future space weather monitoring is the Lagrange point 5 (L5) of the Sun‐Earth system. We test the performance of L5 for space weather monitoring using STEREO B observations of an Earth‐directed coronal mass ejection (CME), seen as a partial halo by SOHO at L1.
L. Rodriguez, C. Scolini, M. Mierla, A. N. Zhukov, M. J. West   +4 more
wiley   +1 more source

High-contrast imaging results with the vortex coronagraph [PDF]

SPIE Proceedings, 2013
The vortex coronagraph has already enabled high-contrast observations very close to bright stars on large ground-based telescopes, and it also has great potential for use on coronagraphic space missions aimed at exoplanet detection and characterization.
Serabyn, E., Trauger, J., Moody, D., Mawet, D., Liewer, K., Krist, J., Kern, B.   +6 more
openaire   +2 more sources