Results 31 to 40 of about 3,877 (212)
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
On-sky speckle nulling demonstration at small angular separation with SCExAO [PDF]
, 2014 This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project.
Clergeon, Christophe +9 more
core +5 more sources
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. +6 more
openaire +2 more sources
, 2015 The imaging channel on the Mid-Infrared Instrument (MIRI) is equipped with four coronagraphs that provide high contrast imaging capabilities for studying faint point sources and extended emission that would otherwise be overwhelmed by a bright point ...
Baudoz, P. +19 more
core +2 more sources
On-sky demonstration of low-order wavefront sensing and control with focal plane phase mask coronagraphs [PDF]
, 2015 The ability to characterize exoplanets by spectroscopy of their atmospheres requires direct imaging techniques to isolate planet signal from the bright stellar glare.
Baudoz, Pierre +8 more
core +5 more sources
Mitigating Worst-case Exozodiacal Dust Structure in High-contrast Images of Earth-like Exoplanets
The Astronomical Journal, 2023 Detecting Earth-like exoplanets in direct images of nearby Sun-like systems brings a unique set of challenges that must be addressed in the early phases of designing a space-based direct imaging mission.
Miles H. Currie +4 more
doaj +1 more source
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
, 2013 High-contrast imaging for the detection and characterization of exoplanets relies on the instrument's capability to block out the light of the host star.
Beuzit, Jean-Luc +4 more
core +3 more sources
Apodized-pupil Lyot coronagraphs: multistage designs for extremely large telescopes [PDF]
, 2010 Earlier apodized-pupil Lyot coronagraphs (APLC) have been studied and developed to enable high-contrast imaging for exoplanet detection and characterization with present-day ground-based telescopes.
Aime +10 more
core +1 more source
On Some Properties of SEP Effective CMEs
International Scholarly Research Notices, Volume 2011, Issue 1, 2011., 2011 Solar energetic particles (SEP) are believed to originate from two different sources, solar flares and coronal mass ejections (CMEs). The large SEP events constitute a serious radiation hazard. The high‐energy solar proton data obtained from NOAA Space Environment Services Center are used to investigate some statistical properties such as speed ...
Nishant Mittal +4 more
wiley +1 more source