Results 171 to 180 of about 1,731,322 (198)

Imaging exoplanets with the coronagraph of JWST/MIRI

Advances in Space Research, 2005
Abstract The James Webb Space Telescope (former NGST) main objectives are the understanding of the Universe and the birth and formation of stars. To achieve this program JWST will include four instruments one of which is a mid IR camera and spectrometer named MIRI dedicated to the study of faint red-shifted galaxies.
Boccaletti, Anthony, Baudoz, Pierre, Baudrand, Jacques, Reess, Jean-Michel, Rouan, Daniel   +4 more
openaire   +3 more sources

Polarization interferometric nulling coronagraph for high-contrast imaging

Applied Optics, 2010
We propose a novel, high-contrast imager called a polarization interferometric nulling coronagraph (PINC) for direct detection of extrasolar planets. The PINC uses achromatic half-wave plates (HWPs) installed in a fully symmetric beam combiner based on polarizing beam splitters.
Naoshi, Murakami, Kaito, Yokochi, Jun, Nishikawa, Motohide, Tamura, Takashi, Kurokawa, Mitsuo, Takeda, Naoshi, Baba   +6 more
openaire   +2 more sources

JWST: A mid-IR coronagraph for imaging extrasolar planets

International Conference on Space Optics — ICSO 2004, 2018
MIRI, the mid-IR instrument of JWST (JamesWebb Space Telescope), will include a coronagraphic device for which the ultimate goal is the detection and caracterization of extrasolar planets around nearby stars. In this paper, we describe the optical concept of MIRI and the instrumental choices that were made in phase A and B regarding the coronagraphic ...
Boccaletti, Anthony, Riaud, Pierre, Baudoz, Pierre, Baudrand, Jacques, Reess, Jean-Michel, Rouan, Daniel   +5 more
openaire   +2 more sources

Differential imaging coronagraph for the detection of faint companions

SPIE Proceedings, 2000
One of the major problems in trying to observe a faint companion from the ground comes from atmospheric turbulence. We present here a new camera capable of subtracting the effect of atmospheric turbulence on the PSF by taking simultaneous images of a star at three different wavelengths centered around the 1.6 micrometers methane absorption band typical
Christian Marois, Rene Doyon, Rene Racine, Daniel Nadeau   +3 more
openaire   +1 more source

Ultraviolet and Visible-light Coronagraphic Imager (UVCI)

SPIE Proceedings, 2003
The HERSCHEL (HElium Resonance Scattering in the Corona and HELiosphere) Sun-Earth Sub-Orbital Program is a proposed sounding-rocket payload designed to investigate helium coronal abundance and solar wind acceleration from a range of solar source structures by obtaining simultaneous observations of the electron, proton and helium solar coronae ...
S. Fineschi, E. Antonucci, ROMOLI, MARCO, D. Gardiol, G. Naletto, S. Giordano, M. Malvezzi, V. . Deppo, L. Zangrilli, G. Noci   +9 more
openaire   +3 more sources

Coronagraphic Techniques for Direct Imaging of Exoplanets and Disks

AIP Conference Proceedings, 2009
Coronagraphic techniques are required for direct high‐contrast imaging of exoplanets and disks. Coronagraphy has recently become an extremely active field, with many high‐performance concepts suggested and several new coronagraphs tested in laboratories and on telescopes.
Olivier Guyon, Tomonori Usuda, Motohide Tamura, Miki Ishii   +3 more
openaire   +1 more source

Near Infrared Coronagraphic Imager for Gemini South

SPIE Proceedings, 2003
The Near Infrared Coronagraphic Imager for Gemini South (NICI) is a dual beam coronagraphic camera operating over the 1.0 to 5.5 micrometer wavelength range with a dedicated adaptive optics system. NICI target science, design and capabilities will be described as an introduction to this instrument slated for deployment in mid 2005.
Douglas W. Toomey, Christ Ftaclas
openaire   +1 more source

Gemini Planet Imager coronagraph testbed results

SPIE Proceedings, 2010
The Gemini Planet Imager (GPI) is an extreme AO coronagraphic integral field unit YJHK spectrograph destined for first light on the 8m Gemini South telescope in 2011. GPI fields a 1500 channel AO system feeding an apodized pupil Lyot coronagraph, and a nIR non-common-path slow wavefront sensor.
Anand Sivaramakrishnan, Rémi Soummer, Ben R. Oppenheimer, G. Lawrence Carr, Jacob L. Mey, Doug Brenner, Charles W. Mandeville, Neil Zimmerman, Bruce A. Macintosh, James R. Graham, Les Saddlemyer, Brian Bauman, Alexis Carlotti, Laurent Pueyo, Peter G. Tuthill, Christophe Dorrer, Robin Roberts, Alexandra Greenbaum   +17 more
openaire   +1 more source

High contrast imaging testbed for the terrestrial planet finder coronagraph

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720), 2004
One of the architectures under consideration for Terrestrial Planet Finder (TPF) is a visible coronagraph. To achieve TPF science goals, the coronagraph must have extreme levels of wavefront correction (less than 1 /spl Aring/ rms over controllable spatial frequencies) and stability to get the necessary suppression of diffracted starlight (10/sup -10 ...
Andrew E. Lowman, John T. Trauger, Brian Gordon, Joseph J. Green, Dwight Moody, Albert F. Niessner, Fang Shi   +6 more
openaire   +1 more source

Estimated performance of a symmetric nulling coronagraph for exoplanet imaging

SPIE Proceedings, 2006
The direct detection of the earth-similar planets nearby bright stars needs high-contrast imaging. We proposed a nulling coronagraph that can, in principle, totally cancel the on-axis point-source starlight for broadband high-contrast imaging. The nulling coronagraph also features close angular distance imaging and high throughput.
D. Ren, E. Serabyn
openaire   +1 more source