Results 1 to 10 of about 3,896,677 (128)

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

Data Reduction Techniques for High Contrast Imaging Polarimetry. Applications to ExPo [PDF]

, 2011
Imaging polarimetry is a powerful tool for detecting and characterizing exoplanets and circumstellar environments. Polarimetry allows a separation of the light coming from an unpolarized source such as a star and the polarized source such as a planet or ...
Bagnulo, Bailey, C. U. Keller, Christou, Donati, H. Canovas, Hiltner, Kalas, Keller, Kuhn, Lagrange, Law, M. Min, M. Rodenhuis, Marois, Marois, Martinez, Miller, Nagaraju, Pancharatnam, Patat, S. V. Jeffers, Todorov, Wynne   +23 more
core   +5 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

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

High spectral and spatial resolution X-ray transmission radiography and tomography using a Color X-ray Camera [PDF]

, 2014
High resolution X-ray radiography and computed tomography are excellent techniques for non-destructive characterization of an object under investigation at a spatial resolution in the micrometer range.
Boone, Matthieu, Cormode, David P, Dierick, Manuel, Garrevoet, Jan, Pauwels, Elin, Scharf, Oliver, Tack, Pieter, Van Hoorebeke, Luc, Van Loo, Denis, Vincze, Laszlo   +9 more
core   +2 more sources

Adaptive Optics Observations of Exoplanets, Brown Dwarfs, & Binary Stars [PDF]

, 2011
The current direct observations of brown dwarfs and exoplanets have been obtained using instruments not specifically designed for overcoming the large contrast ratio between the host star and any wide-separation faint companions. However, we are about to
Baraffe, Beuzit, Liu, Macintosh, Sasha Hinkley, Sivaramakrishnan   +5 more
core   +2 more sources

Transport and spectral functions in high-temperature QCD [PDF]

, 2007
The current status of transport coefficients in relativistic field theories at high temperature is reviewed. I contrast weak coupling results obtained using kinetic theory/diagrammatic techniques with strong coupling results obtained using gauge/gravity ...
Aarts, Gert
core   +2 more sources

The Optical Design of CHARIS: An Exoplanet IFS for the Subaru Telescope [PDF]

, 2013
High-contrast imaging techniques now make possible both imaging and spectroscopy of planets around nearby stars. We present the optical design for the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS), a lenslet-based, cryogenic ...
Brandt, Timothy, Carr, Michael A., Driscoll, Dave, Fagan, Rad, Foster, Allen, Galvin, Michael, Groff, Tyler D., Guyon, Olivier, Hayashi, Masahiko, Janson, Markus, Jovanovic, Nemanja, Kasdin, N. Jeremy, Knapp, Gillian, LeClerc, Dave, Martinache, Frantz, McElwain, Michael W., Peters-Limbach, Mary Anne, Takato, Naruhisa   +17 more
core   +3 more sources