Results 91 to 100 of about 3,877 (212)

Hubble and Spitzer Space Telescope Observations of the Debris Disk around the Nearby K Dwarf HD 92945 [PDF]

, 2011
[ABRIDGED] We present the first resolved images of the debris disk around the nearby K dwarf HD 92945. Our F606W (V) and F814W (I) HST/ACS coronagraphic images reveal an inclined, axisymmetric disk consisting of an inner ring 2".0-3".0 (43-65 AU) from ...
Ardila, D. R., Bryden, G., Chen, C. H., Clampin, M., Ford, H. C., Golimowski, D. A., Illingworth, G. D., Krist, J. E., Plavchan, P., Rieke, G. H., Stapelfeldt, K. R., Su, K. Y. L.   +11 more
core   +2 more sources

Wide-spectral-band Nuller Insensitive to Finite Stellar Angular Diameter with a One-dimensional Diffraction-limited Coronagraph

The Astronomical Journal
Potentially habitable planets around nearby stars less massive than solar-type stars could join targets of the spectroscopy of the planetary reflected light with future space telescopes.
Satoshi Itoh, Taro Matsuo, Motohide Tamura   +2 more
doaj   +1 more source

Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of α Centauri A. II. Binary Star Modeling, Planet and Exozodi Search, and Sensitivity Analysis

The Astrophysical Journal Letters
The James Webb Space Telescope (JWST) observed our closest solar twin, α Centauri A ( α Cen A), with the Mid-Infrared Instrument in the F1550C (15.5 μ m) coronagraphic imaging mode at three distinct epochs between 2024 August and 2025 April.
Aniket Sanghi, Charles Beichman, Dimitri Mawet, William O. Balmer, Nicolas Godoy, Laurent Pueyo, Anthony Boccaletti, Max Sommer, Alexis Bidot, Elodie Choquet, Pierre Kervella, Pierre-Olivier Lagage, Jarron Leisenring, Jorge Llop-Sayson, Michael Ressler, Kevin Wagner, Mark Wyatt   +16 more
doaj   +1 more source

Resolution and calibration effects in high contrast polarimetric imaging of circumstellar scattering regions

Astronomy & Astrophysics
Context. Many circumstellar dust scattering regions have been detected and investigated with polarimetric imaging. However, the quantitative determination of the intrinsic polarization and of dust properties is difficult because of complex observational ...
Schmid H. M., Ma J.
doaj   +1 more source

Lyot-based Ultra-Fine Pointing Control System for Phase Mask Coronagraphs

, 2013
High performance coronagraphic imaging at small inner working angle requires efficient control of low order aberrations. The absence of accurate pointing control at small separation not only degrades coronagraph starlight rejection but also increases the
Baudoz, Pierre, Clergeon, Christophe, Guyon, Olivier, Martinache, Frantz, Matsuo, Taro, Singh, Garima   +5 more
core   +1 more source

New Measures of STEREO CME Masses and Directions

The Astrophysical Journal
Coronal mass ejections (CMEs) propagate away from the Sun throughout interplanetary space. The CME mass influences its evolution and interaction with the background solar wind; however, accurate CME masses are not routinely measured.
C. Kay, A. Vourlidas, L. A. Balmaceda
doaj   +1 more source

Electric Field Conjugation with the Project 1640 coronagraph

, 2013
The Project 1640 instrument on the 200-inch Hale telescope at Palomar Observatory is a coronagraphic instrument with an integral field spectrograph at the back end, designed to find young, self-luminous planets around nearby stars. To reach the necessary
Baranec, Christoph, Beichman, Charles, Brenner, Douglas, Burruss, Rick, Cady, Eric, Crepp, Justin, Dekany, Richard, Hale, David, Hillenbrand, Lynne, Hinkley, Sasha, Ligon, E. Robert, Lockhart, Thomas, Oppenheimer, Ben R., Parry, Ian, Pueyo, Laurent, Rice, Emily, Roberts, Jennifer, Roberts, Jr., Lewis C., Shao, Michael, Sivaramakrishnan, Anand, Soummer, Remi, Tang, Hong, Truong, Tuan, Vasisht, Gautam, Vescelus, Fred, Wallace, J. Kent, Zhai, Chengxing, Zimmerman, Neil   +27 more
core   +1 more source

A Unified View of Coronagraph Image Masks

, 2004
The last few years have seen a variety of new image mask designs for diffraction-limited coronagraphy. Could there still be useful designs as yet undiscovered? To begin to answer this question, I survey and unify the Fraunhofer theory of coronagraph image masks in the context of a one-dimensional classical coronagraph.
openaire   +2 more sources

Multi-stage four-quadrant phase mask: achromatic coronagraph for space-based and ground-based telescopes

, 2011
Less than 3% of the known exoplanets were directly imaged for two main reasons. They are angularly very close to their parent star, which is several magnitudes brighter.
Abe, Baudoz, Baudoz, Bloemhof, Boccaletti, Boccaletti, Carlotti, Galicher, J. Baudrand, Mawet, Mawet, Mawet, P. Baudoz, R. Galicher, Riaud, Riaud, Rouan, Soummer   +17 more
core   +2 more sources

Independent confirmation of {\beta} Pictoris b imaging with NICI

, 2013
Context. {\beta} Pictoris b is one of the most studied objects nowadays since it was identified with VLT/NaCo as a bona-fide exoplanet with a mass of about 9 times that of Jupiter at an orbital separation of 8-9 AU.
Boccaletti, Anthony, Bonnefoy, Mickaël, Chauvin, Gaël, Galicher, Raphaël, Lagrange, Anne-Marie   +4 more
core   +3 more sources