Results 1 to 10 of about 1,396,853 (268)

First Observations of the Brown Dwarf HD 19467 B with JWST

The Astrophysical Journal, 2023
We observed HD 19467 B with JWST’s NIRCam in six filters spanning 2.5–4.6 μ m with the long-wavelength bar coronagraph. The brown dwarf HD 19467 B was initially identified through a long-period trend in the radial velocity of the G3V star HD 19467.
Alexandra Z. Greenbaum, Jorge Llop-Sayson, Ben W.P. Lew, Geoffrey Bryden, Thomas L. Roellig, Marie Ygouf, B. J. Fulton, Daniel R. Hey, Daniel Huber, Sagnick Mukherjee, Michael Meyer, Jarron Leisenring, Marcia Rieke, Martha Boyer, Joseph J. Green, Doug Kelly, Karl Misselt, Eugene Serabyn, John Stansberry, Laurie E. U. Chu, Matthew De Furio, Doug Johnstone, Joshua E. Schlieder, Charles Beichman   +23 more
doaj   +1 more source

Frame combination techniques for ultra-high-contrast imaging [PDF]

SPIE Proceedings, 2008
9 pages, 4 figures, SPIE conference ...
Carson, Joseph C., Feldt, Markus, Desidera, Silvano, Langlois, Maud, Joos, Franco, Mouillet, David, Beuzit, Jean-Luc   +6 more
openaire   +2 more sources

Data-reduction techniques for high-contrast imaging polarimetry [PDF]

Astronomy & Astrophysics, 2011
9 pages, 12 Figures, Accepted for publication in A& ...
Canovas Cabrera, H., Rodenhuis, M., Jeffers, S.V., Min, M., Keller, C.U.   +4 more
openaire   +3 more sources

Detecting Exoplanets Closer to Stars with Moderate Spectral Resolution Integral-field Spectroscopy

The Astronomical Journal, 2023
While radial velocity surveys have demonstrated that the population of gas giants peaks around 3 au, the most recent high-contrast imaging surveys have only been sensitive to planets beyond ∼10 au.
Shubh Agrawal, Jean-Baptiste Ruffio, Quinn M. Konopacky, Bruce Macintosh, Dimitri Mawet, Eric L. Nielsen, Kielan K. W. Hoch, Michael C. Liu, Travis S. Barman, William Thompson, Alexandra Z. Greenbaum, Christian Marois, Jenny Patience   +12 more
doaj   +1 more source

Angular Differential Imaging: A Powerful High‐Contrast Imaging Technique [PDF]

The Astrophysical Journal, 2006
Angular differential imaging is a high-contrast imaging technique that reduces quasi-static speckle noise and facilitates the detection of nearby companions. A sequence of images is acquired with an altitude/azimuth telescope while the instrument field derotator is switched off.
Marois, C, Lafreniere, D, Doyon, R, Macintosh, B, Nadeau, D   +4 more
openaire   +2 more sources

Searching for Planets Orbiting Fomalhaut with JWST/NIRCam

The Astronomical Journal, 2023
We report observations with the JWST/NIRCam coronagraph of the Fomalhaut ( α PsA) system. This nearby A star hosts a complex debris disk system discovered by the IRAS satellite.
Marie Ygouf, Charles A. Beichman, Jorge Llop-Sayson, Geoffrey Bryden, Jarron M. Leisenring, András Gáspár, John E. Krist, Marcia J. Rieke, George H. Rieke, Schuyler Grace Wolff, Thomas L. Roellig, Kate Su, Kevin N. Hainline, Klaus W. Hodapp, Thomas P. Greene, Michael R. Meyer, Douglas M. Kelly, Karl Misselt, John Stansberry, Martha Boyer, Doug Johnstone, Scott Horner, Alexandra Z. Greenbaum   +22 more
doaj   +1 more source

Improved Companion Mass Limits for Sirius A with Thermal Infrared Coronagraphy Using a Vector-apodizing Phase Plate and Time-domain Starlight-subtraction Techniques

The Astronomical Journal, 2023
We use observations with the infrared-optimized Magellan Adaptive Optics (MagAO) system and Clio camera in 3.9 μ m light to place stringent mass constraints on possible undetected companions to Sirius A.
Joseph D. Long, Jared R. Males, Sebastiaan Y. Haffert, Logan Pearce, Mark S. Marley, Katie M. Morzinski, Laird M. Close, Gilles P. P. L. Otten, Frans Snik, Matthew A. Kenworthy, Christoph U. Keller, Philip Hinz, John D. Monnier, Alycia Weinberger, Volker Tolls   +14 more
doaj   +1 more source

Observed Polarized Scattered Light Phase Functions of Planet-forming Disks

The Astrophysical Journal, 2023
Dust particles are the building blocks from which planetary bodies are made. A major goal of studies of planet-forming disks is to constrain the properties of dust particles and aggregates in order to trace their origin, structure, and the associated ...
Christian Ginski, Ryo Tazaki, Carsten Dominik, Tomas Stolker   +3 more
doaj   +1 more source

Temporal contrast reduction techniques for high dynamic-range temporal contrast measurement

Optics Express, 2019
A single-shot characterization of the temporal contrast of a petawatt laser pulse with a high dynamic-range, is important not only for improving conditions of the petawatt laser facility itself, but also for various high-intensity laser physics experiments, which is still a difficult problem. In this study, a new idea for improving the dynamic-range of
Xiong, Shen, Peng, Wang, Jingxin, Zhu, Zhe, Si, Yuxia, Zhao, Jun, Liu, Ruxin, Li   +6 more
openaire   +2 more sources

High contrast microwave tomography using topology optimization techniques

Journal of Computational and Applied Mathematics, 2010
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Eddie Wadbro, Martin Berggren
openaire   +2 more sources