Results 21 to 30 of about 221 (177)
Space Weather, Volume 18, Issue 10, October 2020., 2020 Abstract The Space Weather Research and Forecasting Act (PROSWIFT) passed the U.S. Senate in July 2020 and the House of Representative on 16 September; it directs NOAA to capture remote images of coronal mass ejections (CMEs) with the Space Weather Follow‐On at L1 (SWFO‐L1) mission.
Noé Lugaz
wiley +1 more source
The Astronomical Journal, 2023 Wolf 359 (CN Leo, GJ 406, Gaia DR3 3864972938605115520) is a low-mass star in the fifth-closest neighboring system (2.41 pc). Because of its relative youth and proximity, Wolf 359 offers a unique opportunity to study substellar companions around M stars ...
Rachel Bowens-Rubin +18 more
doaj +1 more source
JWST/NIRCam Coronagraphy of the Young Planet-hosting Debris Disk AU Microscopii
The Astronomical Journal, 2023 High-contrast imaging of debris disk systems permits us to assess the composition and size distribution of circumstellar dust, to probe recent dynamical histories, and to directly detect and characterize embedded exoplanets. Observations of these systems
Kellen Lawson +22 more
doaj +1 more source
High contrast imaging wavefront sensor referencing from coronagraphic images [PDF]
Techniques and Instrumentation for Detection of Exoplanets X, 2021 A 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 aberrations in the non-common path. Those non-common path aberrations (NCPA) are particularly challenging to compensate for as they are not directly measured, and because they ...
Skaf, Nour +13 more
openaire +2 more sources
High contrast imaging with the JWST NIRCAM coronagraph [PDF]
SPIE Proceedings, 2005 Relative to ground-based telescopes, the James Webb Space Telescope (JWST) will have a substantial sensitivity advantage in the 2.2-5pm wavelength range where brown dwarfs and hot Jupiters are thought to have significant brightness enhancements. To facilitate high contrast imaging within this band, the Near-Infrared Camera (NIRCAM) will employ a Lyot ...
Green, Joseph J. +7 more
openaire +2 more sources
Rectangular-Mask Coronagraphs for High-Contrast Imaging [PDF]
The Astrophysical Journal, 2004 We present yet another new family of masks for high-contrast imaging as required for the to-be-built terrestrial planet finder space telescope. The ``best'' design involves a square entrance pupil having a 4-vane spider, a square image-plane mask containing a plus-sign shaped occulter to block the starlight inside 0.6 lambda/D, and a Lyot-plane mask ...
Vanderbei, Robert J. +2 more
openaire +3 more sources
XAO coronagraphy with the High-Order Test bench
EPJ Web of Conferences, 2011 Extreme adaptive optics systems dedicated to the search for extra solar planets are currently being developed for 8–10 meter class telescopes. The High-Order Test bench (HOT) is a high-contrast imaging adaptive optics bench developed at ESO.
Kasper M. +2 more
doaj +1 more source
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. An understanding of how quasi-static speckles originate from instrumental errors is paramount to the ...
Martinez, P. +3 more
openaire +3 more sources
ALICE Data Release: A Revaluation of HST-NICMOS Coronagraphic Images [PDF]
The Astronomical Journal, 2018 Abstract The Hubble Space Telescope NICMOS instrument was used from 1997 to 2008 to perform coronagraphic observations of about 400 targets. Most of them were part of surveys looking for substellar companions or resolved circumstellar disks to young nearby stars, making the NICMOS coronagraphic archive a valuable database for exoplanets ...
Hagan, J. Brendan +3 more
openaire +3 more sources
Subaru AO Coronagraphic and Direct Imaging of YSOs [PDF]
Symposium - International Astronomical Union, 2004 A cold near-infrared stellar coronagraph combined with adaptive optics (CIAO) is introduced. As an open-use instrument on the Subaru 8.2-m telescope, it has been used for several star formation studies with high spatial resolutions (from natural seeing of about 0.6 arcsec down to 0.07 arcsec with adaptive optics).
Motohide Tamura +2 more
openaire +1 more source