Results 11 to 20 of about 962 (206)

Speckle statistics in direct and coronagraphic imaging [PDF]

Proceedings of the International Astronomical Union, 2021
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.
Soummer, Rémi, Sivaramakrishnan, Anand, Ferrari, André, Jolissaint, Laurent, Aime, Claude   +4 more
core   +3 more sources

Coronagraphic imaging on the VLTI with VIDA

EAS Publications Series, 2004
In a few years, the VLTI will be able to combine light from 4 to 8 telescopes equipped with adaptive optics. In order to exploit the full VLTI infrastructure, a second generation instrument, based on the densified pupil concept (VIDA), has been proposed ...
O. Lardière
core   +2 more sources

ALICE Data Release: A Revaluation of HST -NICMOS Coronagraphic Images [PDF]

The Astronomical Journal, 2018
International audienceThe Hubble Space Telescope NICMOS instrument was used from 1997 to 2008 to perform coronagraphic observations of about 400 targets.
Soummer, Rémi, Hagan, J. Brendan, Vigan, Arthur, Choquet, Elodie   +3 more
core   +5 more sources

Speckle temporal stability in XAO coronagraphic images [PDF]

Astronomy & Astrophysics, 2012
Context. The major source of noise limiting high-contrast imaging is caused by quasi-static speckles. Speckle noise originates from wavefront errors caused by various independent sources, and evolves on different timescales depending on their nature.
E. Aller Carpentier, C. Loose, Kasper, M., M. Kasper, Aller Carpentier, E., Loose, C., P. Martinez, Martinez, P.   +7 more
core   +4 more sources

High contrast imaging wavefront sensor referencing from coronagraphic images [PDF]

Techniques and Instrumentation for Detection of Exoplanets X, 2021
SPIE PROCEEDING. arXiv admin note: substantial text overlap with arXiv:2110.14997A key challenge of high contrast imaging (HCI) is to differentiate a speckle from an exoplanet signal. The sources of speckles are a combination of atmospheric residuals and
Vievard, Sebastien, Lozi, Julien, Ferreira, Florian, Deo, Vincent, Sevin, Arnaud, Vidal, Fabrice, Norris, Barnaby, Ahn, Kyohoon, Boccaletti, Anthony, Skaf, Nour, Currie, Thayne, Gendron, Eric, Guyon, Olivier, Bertrou-Cantou, Arielle   +13 more
core   +3 more sources

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

A Multi‐Purpose Heliophysics L4 Mission

Space Weather, Volume 19, Issue 9, September 2021., 2021
Abstract The Earth‐Sun Lagrangian point 4 is a meta‐stable location at 1 AU from the Sun, 60° ahead of Earth's orbit. It has an uninterrupted view of the solar photosphere centered on W60, the Earth's nominal magnetic field connection to the Sun. Such a mission on its own would serve as a solar remote sensing observatory that would oversee the entire ...
A. Posner, C. N. Arge, J. Staub, O. C. StCyr, D. Folta, S. K. Solanki, R. D. T. Strauss, F. Effenberger, A. Gandorfer, B. Heber, C. J. Henney, J. Hirzberger, S. I. Jones, P. Kühl, O. Malandraki, V. J. Sterken   +15 more
wiley   +1 more source

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

Hiding Dust around ϵ Eridani

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, András Gáspár, George H. Rieke, Nicholas Ballering, Marie Ygouf   +4 more
doaj   +1 more source