Results 61 to 70 of about 3,877 (212)

Telescope polarization and image quality: Lyot coronagraph performance [PDF]

SPIE Proceedings, 2016
In this paper we apply a vector representation of physical optics, sometimes called polarization aberration theory to study image formation in astronomical telescopes and instruments. We describe image formation in-terms of interferometry and use the Fresnel polarization equations to show how light, upon propagation through an optical system become ...
Breckinridge, J. B., Chipman, R. A.
openaire   +2 more sources

A Coronagraphic Pilot Study of the Circumstellar Environments around Red Supergiants: CD -31°4916’s Dust Morphology

The Astronomical Journal
Many mechanisms have been proposed to contribute to massive-star mass loss, but in general little is known about the physics involved. Studies of circumstellar environments around massive stars might help to determine which mechanisms are the most common.
Jamie R. Lomax, Emily M. Levesque, John P. Wisniewski, John H. Debes   +3 more
doaj   +1 more source

Optical and mechanical design of the extreme AO coronagraphic instrument MagAO-X

, 2018
Here we review the current optical mechanical design of MagAO-X. The project is post-PDR and has finished the design phase. The design presented here is the baseline to which all the optics and mechanics have been fabricated.
Close, Laird M., Durney, Olivier, Gasho, Victor, Hedglen, Alex, Jean, Madison, Kautz, Maggie, Lumbres, Jennifer, Males, Jared R., Miller, Kelsey, Sauve, Corwynn, Schatz, Lauren, Van Gorkom, Kyle   +11 more
core   +1 more source

A Large Double-ring Disk Around the Taurus M Dwarf J04124068+2438157

The Astrophysical Journal, 2023
Planet formation imprints signatures on the physical structures of disks. In this paper, we present high-resolution (∼50 mas, 8 au) Atacama Large Millimeter/submillimeter Array observations of 1.3 mm dust continuum and CO line emission toward the disk ...
Feng Long, Bin B. Ren, Nicole L. Wallack, Daniel Harsono, Gregory J. Herczeg, Paola Pinilla, Dimitri Mawet, Michael C. Liu, Sean M. Andrews, Xue-Ning Bai, Sylvie Cabrit, Lucas A. Cieza, Doug Johnstone, Jarron M. Leisenring, Giuseppe Lodato, Yao Liu, Carlo F. Manara, Gijs D. Mulders, Enrico Ragusa, Steph Sallum, Yangfan Shi, Marco Tazzari, Taichi Uyama, Kevin Wagner, David J. Wilner, Jerry W. Xuan   +25 more
doaj   +1 more source

Lyot-based Low Order Wavefront Sensor: Implementation on the Subaru Coronagraphic Extreme Adaptive Optics System and its Laboratory Performance

, 2014
High throughput, low inner working angle (IWA) phase masks coronagraphs are essential to directly image and characterize (via spectroscopy) earth-like planets.
Baudoz, Pierre, Guyon, Olivier, Jovanovic, Nemanja, Kudo, Tomoyuki, Kuhn, Jonas G, Martinache, Frantz, Serabyn, Eugene, Singh, Garima   +7 more
core   +2 more sources

Performance of the near-infrared coronagraphic imager on Gemini-South [PDF]

SPIE Proceedings, 2008
We present the coronagraphic and adaptive optics performance of the Gemini-South Near-Infrared Coronagraphic Imager (NICI). NICI includes a dual-channel imager for simultaneous spectral difference imaging, a dedicated 85-element curvature adaptive optics system, and a built-in Lyot coronagraph.
Chun, Mark, Toomey, Doug, Wahhaj, Zahed, Biller, Beth, Artigau, Etienne, Hayward, Tom, Liu, Mike, Close, Laird, Hartung, Markus, Rigaut, Francois, Ftaclas, Christ   +10 more
openaire   +2 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 Survey of Protoplanetary Disks Using the Keck/NIRC2 Vortex Coronagraph

The Astronomical Journal
Recent Atacama Large Millimeter/submillimeter Array (ALMA) observations of protoplanetary disks in the millimeter continuum have shown a variety of radial gaps, cavities, and spiral features.
Nicole L. Wallack, Jean-Baptiste Ruffio, Garreth Ruane, Bin B. Ren, Jerry W. Xuan, Marion Villenave, Dimitri Mawet, Karl Stapelfeldt, Jason J. Wang, Michael C. Liu, Olivier Absil, Carlos Alvarez, Jaehan Bae, Charlotte Bond, Michael Bottom, Benjamin Calvin, Élodie Choquet, Valentin Christiaens, Therese Cook, Bruno Femenía Castellá, Carlos Gomez Gonzalez, Greta Guidi, Elsa Huby, Joel Kastner, Heather A. Knutson, Tiffany Meshkat, Henry Ngo, Sam Ragland, Maddalena Reggiani, Luca Ricci, Eugene Serabyn, Taichi Uyama, Jonathan P. Williams, Peter Wizinowich, Zoe Zawol, Shangjia Zhang, Zhaohuan Zhu   +36 more
doaj   +1 more source

The HR 4796A Debris System: Discovery of Extensive Exo-Ring Dust Material [PDF]

, 2017
The optically and IR bright, and starlight-scattering, HR 4796A ring-like debris disk is one of the most (and best) studied exoplanetary debris systems.
Debes, John H., Gaspar, Andras, Grady, Carol A., Henning, Thomas, Hines, Dean C., Kuchner, Marc J., Perrin, Marshall, Schneider, Glenn, Wisniewski, John P.   +8 more
core   +3 more sources

Inferring the Solar Wind Velocity in the Outer Corona Based on Multiview Observations of Small-scale Transients by STEREO/COR2

The Astrophysical Journal
Based on the Heliospheric Imager-1 images of the STEREO twin spacecraft, we established the CORrelation-Aided Reconstruction (CORAR) technique to locate and reconstruct the 3D structures of solar wind transients in interplanetary space.
Shaoyu Lyu, Yuming Wang, Xiaolei Li, Quanhao Zhang, Jiajia Liu   +4 more
doaj   +1 more source